All tools
60+ free online calculators, converters, and generators — WPM test, countdown timer, BMI, unit converter and more. All in your browser, no signup, no install.
BMI Calculator (metric & imperial, with category)
Calculate your Body Mass Index in metric or imperial units, with category interpretation.
Calorie Calculator (BMR & TDEE, Mifflin-St Jeor)
Estimate your daily calorie needs using the Mifflin-St Jeor BMR formula and an activity multiplier. Includes targets for weight loss and gain.
Ideal Weight Calculator (Devine, Robinson, Miller, Hamwi)
Estimate ideal body weight using four classic clinical formulas plus the WHO healthy BMI range. Choose by height and sex.
Due Date Calculator — LMP, IVF, ultrasound or conception
Estimate your due date from your last period (with cycle-length adjustment), conception, an IVF transfer (day 3 or 5), or an ultrasound. Shows the full-term 37–42 week window and current gestational age.
Conception Date Calculator — from due date or birth date
Work backwards to estimate when you conceived — from your due date or your baby's birth date. Shows the most likely conception day, a conception window, and the likely intercourse dates.
Period Calculator — next 6 periods & cycle phase
Predict your next six periods, see today's cycle day and phase, your fertile window, and export the dates to your calendar — from your last period, cycle length, and period length.
Pregnancy Weight Gain Calculator — by pre-pregnancy BMI
See your recommended pregnancy weight gain based on your pre-pregnancy BMI and the IOM guidelines — the full-term range, how much to have gained by your current week, and whether you're on track.
hCG Calculator — doubling time & rise from two values
Enter two quantitative hCG blood results and their dates to calculate the doubling time, the 48-hour rise, and the daily rise — a tool for understanding early-pregnancy hCG trends, not a diagnosis.
Water Intake Calculator (daily target by weight)
Estimate your recommended daily water intake based on body weight and activity level. Shown in liters, ounces, cups, and bottle equivalents.
Running Pace Calculator (time, pace, speed)
Calculate running pace from distance and time, or finish time from a target pace. Output per-km, per-mile, km/h, and mph.
Macro Calculator (P/F/C grams from TDEE and goal)
Calculate daily protein, fat, and carb targets from your TDEE and weight goal. Uses 30/30/40 split with a protein floor of 1.6 g/kg.
BMR Calculator (Mifflin, Harris-Benedict, Katch-McArdle)
Calculate basal metabolic rate via three formulas: Mifflin-St Jeor (default), Harris-Benedict (legacy), and Katch-McArdle (uses lean mass).
Ovulation Calculator — fertile window for irregular cycles
Find your ovulation date and fertile window even with irregular cycles. See your next 6 fertile windows, the earliest reliable test date, and export the days to your calendar (.ics).
Body Fat Calculator (US Navy Method)
Estimate body fat percentage using the US Navy method (waist, neck, and hip for women). Returns fat mass, lean mass, and fitness category.
Pregnancy Week Calculator — weeks + prenatal schedule
See exactly how many weeks and days pregnant you are — from your last period or an ultrasound — plus fetal age, trimester, due date, and your prenatal appointment schedule with real dates.
One-Rep Max Calculator (5 formulas + percent table)
Estimate your 1RM (one-rep max) from any submaximal lift. Five validated formulas (Epley, Brzycki, Lombardi, O'Conner, Lander) plus a training-percentage table.
Target Heart Rate Calculator (5 training zones)
Calculate your max heart rate and 5 training zones (recovery, fat burn, aerobic, threshold, max). Karvonen formula uses resting HR for accuracy.
Weight Loss Calculator (timeline + target date)
Calculate how long it takes to reach your target weight at a given daily calorie deficit. Returns target date, weeks, months, and weekly weight loss.
Waist-to-Hip Ratio Calculator (cardiovascular risk)
Calculate WHR (waist circumference / hip circumference). Categorizes risk level by sex per WHO thresholds.
Sleep Calculator — Find Your Ideal Bedtime or Wake-Up Time
Calculate the best bedtime or wake-up time based on 90-minute sleep cycles.
Blood Pressure Checker — AHA 2017 Categories Explained
Enter your systolic and diastolic pressure to get your AHA category, pulse pressure, and plain-English advice.
Exercise Calorie Calculator — MET-based calories burned
Calculate calories burned during exercise using MET values. Supports 18 activities, kg/lbs, and shows fat burned.
Steps to Distance Calculator — km, Miles, Calories & Time
Convert step count to distance in km or miles. Estimates walking time and calories burned based on your height, stride length, and weight.
Calorie Deficit Calculator — TDEE & Weight Loss
Find your daily calorie deficit to lose weight safely. Uses Mifflin-St Jeor BMR and your activity level to set a realistic target.
Protein Intake Calculator – Daily Grams
Estimate your daily protein needs from body weight and activity.
Waist-to-height ratio calculator
Calculate your waist-to-height ratio (WHtR) from waist and height in cm.
Body Surface Area Calculator (BSA)
Estimate body surface area (BSA) in m² using the Mosteller formula.
A1C to Average Glucose Calculator (eAG)
Convert your HbA1c percentage into estimated average glucose in mg/dL and mmol/L.
Ponderal Index Calculator (kg/m³)
Calculate your ponderal index from height and weight.
Maximum Heart Rate Calculator (by Age)
Estimate your maximum heart rate from your age in beats per minute (bpm).
Dog Age Calculator — Convert Dog Years to Human Years
Convert your dog's age into human-equivalent years instantly.
Cat Age Calculator - Cat Years to Human Years
Convert your cat's age into human-equivalent years instantly.
Length Converter (mm, cm, m, km, in, ft, yd, mi)
Convert between metric and imperial length units instantly. Includes mm, cm, m, km, inches, feet, yards, and miles.
Temperature Converter (Celsius, Fahrenheit, Kelvin, Rankine)
Convert between Celsius, Fahrenheit, Kelvin, and Rankine. All four scales update at once.
Weight Converter (kg, g, t, lb, oz, stone, mg)
Convert between metric and imperial mass units. Includes mg, grams, kilograms, tonnes, ounces, pounds, and stones.
Area Converter (m², ft², acre, hectare, tsubo)
Convert between metric, imperial, and Japanese area units. Includes m², km², hectare, ft², acre, mile², and tsubo.
Time Unit Converter (ms, s, min, h, days, weeks, months, years)
Convert between time units from milliseconds to years. Months use the average length, years use the Julian definition.
Data Size Converter (B, KB, MB, GB, TB — SI and IEC)
Convert digital storage sizes between bytes, kilobytes, megabytes, gigabytes, terabytes, and petabytes. Switch between SI (1000) and IEC binary (1024).
Volume Converter (mL, L, gal, fl oz, cup, tsp)
Convert between metric and US/UK volume units. Includes mL, liters, m³, teaspoons, tablespoons, fluid ounces, cups, pints, quarts, and gallons.
Speed Converter (km/h, mph, m/s, knot, Mach)
Convert between common speed units: km/h, mph, m/s, ft/s, knots, and Mach. Used for vehicles, weather, aviation, and physics.
Fuel Economy Converter (mpg US/UK, km/L, L/100km)
Convert vehicle fuel economy between mpg (US), mpg (UK), km per liter, and L per 100 km. Distinguishes US and UK gallons.
Pressure Converter (Pa, bar, psi, atm, mmHg)
Convert between pressure units: Pascal, bar, psi, atmosphere, mmHg, Torr, and more. All units update simultaneously when you change one.
Angle Converter (degrees, radians, gradians, turns)
Convert angles between degrees, radians, gradians, turns, arcminutes, and arcseconds. All 6 units update simultaneously.
Power Unit Converter (W, kW, hp, BTU/h)
Convert between power units: watts, kilowatts, megawatts, mechanical horsepower, metric horsepower (PS), BTU/hour, foot-pounds/second, cal/s, kcal/h.
Cooking Unit Converter — Cups, Tbsp, Tsp, ml, g, oz
Convert cooking measurements between cups, tablespoons, teaspoons, fluid oz, ml, and liters. Includes ingredient-aware weight converter for flour, sugar, butter, and more.
CSS Unit Converter — px, rem, em, pt, % Online
Convert CSS units instantly: px to rem, rem to px, em, pt, and %. Set your base font size for accurate rem and em conversions. Essential for responsive web design.
Currency Converter — 31 Currencies, Instant Results
Convert between 31 major world currencies with static 2025 reference rates. Instant results, no sign-up, works offline.
Wind Chill Calculator — Feels Like Temperature
Calculate the wind chill index and see how cold it feels with current temperature and wind speed.
Heat Index Calculator — Feels Like Temperature & Humidity
Calculate the apparent 'feels like' temperature from air temperature and relative humidity using the NWS Rothfusz formula.
Coffee Ratio Calculator – Water to Coffee
Find the perfect water-to-coffee ratio for pour-over and drip.
Age Calculator (years, months, days, weeks, hours)
Calculate exact age in years, months, days, weeks, and hours from any birth date to any target date.
Free Countdown Timer 2026 — Days, Hours, Minutes, Seconds (No Signup)
Free online countdown timer. Pick any date & time, see days/hours/minutes/seconds tick down live. Add event title, watch elapsed time after target — no signup.
Unix Timestamp Converter (sec, ms, ISO, local)
Convert between Unix timestamps (seconds or milliseconds) and human-readable dates. Shows ISO 8601, local time, and relative time.
Date Calculator (add/subtract days, or difference between dates)
Add or subtract years/months/days from a date, or find the precise difference between two dates including business days.
Timezone Converter (compare time across multiple zones)
Convert one moment in time across multiple timezones at once. Add or remove zones; great for scheduling international meetings.
Cron Expression Tester (preview next 5 runs)
Test cron expressions and see the next 5 scheduled runs in your local timezone. Validates fields, supports ranges, lists, and steps.
Pomodoro Timer (25/5/15 with audio cue)
Classic Pomodoro Technique timer: 25 minutes focus + 5 minutes short break, every 4th break is 15 minutes. Audio chime when each phase ends.
Leap Year Checker (with rule explanation)
Check if a year is a leap year and see why. Shows February days, year days, and the previous and next leap years.
Workdays Calculator (skip weekends + holidays)
Count business days between two dates, excluding weekends and any holidays you list. Customizable: include Saturday or Sunday as workdays if needed.
ISO Week Number Calculator (week-of-year)
Find the ISO 8601 week number, ISO weekday, and week date range for any calendar date. Includes day-of-year and weeks-in-year.
Age Difference Calculator (between two people)
Calculate the exact age difference between two people in years, months, days, plus totals in weeks, days, and hours.
Moon Phase Calculator (any date, illumination %)
See the moon phase, age in days, illumination percentage, and dates of the next new and full moons for any calendar date.
Stopwatch (millisecond precision, lap times)
High-precision in-browser stopwatch with start/pause, lap recording, and split-time calculation. Millisecond display, monotonic clock for accuracy.
Hours Calculator — Add, Subtract & Convert Time
Add or subtract time durations, find the gap between two times, and convert hours to decimal — all in one tool.
Day of the Week Calculator — Find Any Weekday
Enter any calendar date and instantly see which day of the week it falls on.
Percentage Calculator (% of, what %, % change)
Three percentage calculators in one: 'X% of Y', 'X is what % of Y', and percentage change between two values.
GPA Calculator (4.0 scale, weighted by credits)
Calculate your GPA on the 4.0 scale, weighted by course credit hours. Add as many courses as you need.
Number to Words Converter — English Word Form
Convert any number up to 999 quadrillion into English words. Shows the full word form, comma-formatted number, and word count.
Number Base Converter (binary, octal, decimal, hex)
Convert numbers between binary, octal, decimal, and hexadecimal. Validates input for the chosen base and shows all four representations.
Random Number Generator (cryptographically secure, unique mode)
Generate random integers in any range using your browser's secure random API. Optionally enforce uniqueness for lottery, raffle, or sample-without-replacement use cases.
Paint Calculator (gallons or liters from room size)
Calculate how much paint you need based on room dimensions, number of coats, and doors/windows. Output in liters or gallons.
Aspect Ratio Calculator (preserve ratio when resizing)
Calculate width or height to preserve a target aspect ratio. Common ratios (16:9, 9:16, 1:1, 4:3, 21:9) one-click presets included.
Dice Roller (d4 to d100, with modifier and history)
Roll any number of dice with any number of sides. Cryptographically random, with modifier (+N), running total, and roll history.
Statistics Calculator (mean, median, std dev, quartiles)
Compute mean, median, mode, standard deviation, variance, range, quartiles, and more from a list of numbers. Sample or population mode.
Prime Number Checker (with factorization)
Check whether a number is prime. If not, see its prime factorization. Plus the next and previous prime numbers.
Quadratic Equation Solver (ax² + bx + c = 0)
Solve any quadratic equation. Returns real or complex roots, the discriminant, and the parabola's vertex coordinates.
Fraction Calculator (add, subtract, multiply, divide)
Add, subtract, multiply, or divide two fractions. Returns simplified form, decimal equivalent, and mixed-number representation.
GCD & LCM Calculator (with prime factorizations)
Find the greatest common divisor (GCD) and least common multiple (LCM) of two or more integers, plus each number's prime factorization.
Triangle Calculator (right angle, SSS, SAS)
Compute a triangle's area, perimeter, sides, and angles. Three modes: right triangle (Pythagorean), three sides (SSS), or two sides + included angle (SAS).
Scientific Notation Converter (decimal ↔ scientific)
Convert decimal numbers to/from scientific (1.23 × 10^4) and engineering (1.23e3) notation. Bidirectional, with E-notation output.
Factorial / Permutations / Combinations Calculator
Calculate n! (factorial), P(n,k) permutations, and C(n,k) combinations. Handles large integers via BigInt up to n=5000.
Prime Factorization Calculator — Find Prime Factors Instantly
Enter any integer up to 1 billion to find its prime factorization. Shows each prime factor with its exponent and the exponential notation.
Math Expression Calculator — evaluate any formula online
Type any math expression and get an instant result. Supports arithmetic, powers, roots, trig, logs, and more.
Number Sequence Generator — Arithmetic, Geometric, Fibonacci & More
Generate arithmetic, geometric, Fibonacci, square, prime, and triangular number sequences. Shows the full sequence, sum, and formula.
Circle Calculator — Area, Circumference, Diameter, Radius
Enter any one circle measurement — radius, diameter, area, or circumference — and instantly get all the others. Supports arc length and sector area for a given central angle.
Probability Calculator — Basic, Permutations, Combinations, Dice
Calculate probabilities, permutations (nPr), combinations (nCr), and dice roll outcomes. Four dedicated tabs cover every common probability problem.
Percent Error Calculator — Experimental vs Theoretical
Calculate percent error between an experimental (measured) value and a theoretical (accepted) value. Shows signed error, absolute error, and the difference.
Fibonacci Calculator — Nth Term and Sequence
Calculate any Fibonacci number up to the 100th term, or list the first 50 terms of the sequence. Supports large numbers accurately.
Matrix Calculator — Add, Multiply, Determinant
Perform matrix addition, subtraction, multiplication, transpose, and determinant on 2×2 or 3×3 matrices — all in your browser.
Pixel Density Calculator — PPI for Any Screen
Calculate pixels per inch (PPI) for any display. Enter resolution and screen size; get PPI, megapixels, and display quality rating instantly.
Grade Calculator — Weighted Average & Letter Grade
Calculate your weighted average grade, letter grade, and GPA equivalent from multiple assignments or exams.
Pythagorean Theorem Calculator — Find Any Side
Enter any two sides of a right triangle to instantly find the missing side, plus area, perimeter, and all three angles.
Ohm's Law Calculator — Voltage, Current, Resistance & Power
Calculate voltage, current, resistance, or power using Ohm's Law (V=IR) and the power formula (P=VI). Shows all four values with smart unit display.
Significant Figures Calculator — Count & Round Sig Figs
Count significant figures in any number or round to a specified number of sig figs. Shows a digit-by-digit breakdown and scientific notation.
Geometric Shapes Calculator — Volume & Surface Area
Calculate volume, surface area, and key dimensions for 6 common 3D shapes: sphere, cylinder, cone, cube, rectangular prism, and triangular prism.
Percentage Change Calculator — Increase & Decrease
Calculate percentage change between two values, find a new value after a percentage change, or reverse-calculate the original value from a known result.
Slope Calculator – Two Points to Slope & Angle
Find the slope, angle, and grade from two points on a line.
Square Footage Calculator – Area in ft²
Calculate the area of a room or space in square feet.
Midpoint Calculator – Midpoint of Two Points
Find the midpoint between two points on the coordinate plane.
Concrete Calculator – Cubic Yards & Meters
Estimate the concrete volume needed for a slab in cubic yards.
Z-Score Calculator – Standard Score
Calculate the z-score (standard score) of a value.
Gravel Calculator - Estimate Yards & Tons
Estimate the gravel you need for a driveway, path, or landscaping in cubic yards and tons.
Cylinder volume calculator (cm³ and liters)
Calculate the volume of a cylinder from its radius and height.
Kinetic Energy Calculator (KE = ½mv²)
Calculate kinetic energy from mass and velocity in joules.
Density Calculator (Mass / Volume)
Calculate density from mass and volume in g/cm³.
Board Foot Calculator - Lumber BF Measurement
Calculate board feet for lumber from thickness, width, length, and quantity.
Box Volume Calculator (cm to liters)
Calculate the volume of a rectangular box from length, width and height in centimeters.
Tile Calculator - Tiles Needed for Any Room
Calculate how many square tiles you need for a room, with a 10% waste allowance.
Molarity Calculator (mol/L to moles)
Calculate moles of solute from molarity and volume.
Average Speed Calculator (km/h)
Calculate average speed from distance and time, in km/h.
Proportion Calculator: Solve a / b = c / x
Solve the proportion a / b = c / x and find x by cross-multiplication.
Sphere Volume Calculator (4/3·π·r³)
Calculate the volume of a sphere from its radius in cm³ and liters.
Cone Volume Calculator (cm³ and Liters)
Calculate the volume of a cone from its radius and height.
Logarithm calculator - compute log base b of any value
Calculate the logarithm of a value to any base.
Combination Calculator (nCr) — Choose r from n
Calculate the number of combinations nCr for choosing r items from n when order does not matter.
Permutation Calculator (nPr)
Calculate the number of ordered arrangements nPr of r items from n.
Exponent Calculator - Raise Base to a Power
Raise any base to an exponent (power) and get the result instantly.
Modulo Calculator - Remainder of a mod b
Calculate a mod b, the remainder after dividing a by b.
Square Root Calculator (√ and ∛)
Find the square root and cube root of any non-negative number instantly.
Half-life Calculator — Exponential Decay
Calculate the amount remaining after radioactive or substance decay using a half-life.
Ratio Simplifier — Reduce a:b to Lowest Terms
Simplify any ratio a:b to its lowest terms instantly.
Finance
53Tip Calculator (with bill split for groups)
Calculate tip and split a restaurant bill across any number of people. Quick presets for common tip percentages.
Compound Interest Calculator (with monthly contributions)
See how an investment grows over time with compounding interest and optional monthly contributions. Customizable compounding frequency.
Loan Calculator (monthly payment, interest, total cost)
Calculate the monthly payment for any fixed-rate loan, plus total amount paid and total interest over the life of the loan.
Sales Tax / VAT Calculator (add tax or extract from total)
Add sales tax to a pre-tax amount or extract the tax from a tax-inclusive total. Works for any tax rate (sales tax, VAT, GST).
Discount Calculator (with optional sales tax)
Calculate the final price after a percentage discount, plus optional sales tax. See how much you saved at a glance.
Mortgage Calculator (PITI: principal, interest, tax, insurance)
Calculate the full monthly mortgage payment including principal, interest, property tax, insurance, PMI (if applicable), and HOA fees.
Markup Calculator (cost to sell price + margin)
Calculate sell price, gross profit, and gross margin from cost and markup percentage. Distinguishes markup vs margin clearly.
Free Unit Price Calculator 2026 — Cost per Gram, Ounce or Count
Free unit price calculator. Enter prices and quantities (g, oz, count, fl oz) to compare cost per unit instantly. Find the cheaper option at the store.
Credit Card Validator (Luhn check + brand detection)
Validate a credit card number's checksum (Luhn algorithm) and detect the issuing brand. Browser-only — your card number never leaves your device.
Savings Goal Calculator (time to reach target)
Find out how long it takes to reach a savings goal given a starting balance, monthly contribution, and annual return.
Salary Converter (hourly, daily, weekly, monthly, annual)
Convert pay between hourly, daily, weekly, monthly, and annual rates. Useful for comparing job offers and contractor rates.
Retirement Calculator (compound projection + inflation-adjusted)
Project your retirement savings with monthly contributions, expected return, and inflation. Shows nominal balance, today-dollar value, and 4%-rule monthly income.
Simple Interest Calculator (I = P × r × t)
Calculate simple interest on a principal amount given an annual rate and time. Returns interest earned and total balance.
Car Loan Calculator (monthly payment + total interest)
Calculate monthly auto-loan payment, total interest, and total cost. Includes down payment and trade-in value adjustments.
Crypto Profit Calculator (with exchange fees)
Calculate crypto trading profit, ROI, and fee impact. Enter amount held, buy price, sell price, and exchange fee % — get net profit after both buy and sell fees.
Stock Profit Calculator (with dividends + taxes)
Calculate stock trade profit including buy/sell commissions, dividends received, and capital-gains tax. Returns net after-tax profit and ROI.
Inflation Calculator (purchasing power over time)
See how inflation erodes purchasing power: future cost of today's money, plus today's value of a future amount.
Emergency Fund Calculator (3-12 months of expenses)
Calculate the size of an emergency fund (3, 6, 9, or 12 months of expenses) and how long it takes to build at your savings rate.
Income Tax Bracket Calculator (JP / US)
Calculate income tax owed using progressive brackets. Japan, US single, and US married-filing-jointly. Returns total tax, effective rate, marginal rate, and per-bracket breakdown.
VAT / Sales Tax Calculator (international rates)
Add or remove VAT/GST/sales tax. Quick presets for Japan, UK, EU countries, Australia, Canada, China.
ROI Calculator (Return on Investment + Annualized)
Calculate return on investment (ROI) % and annualized return for any holding period. Works for any investment: stocks, real estate, business, side projects.
Fuel Cost Calculator (trip cost + per-person split)
Calculate fuel cost for any trip from distance, fuel efficiency (MPG or km/L), and fuel price. Optional split between passengers.
Net Worth Calculator (assets minus liabilities)
Calculate net worth: total assets minus total liabilities. Categorized inputs for cash, investments, retirement, real estate, vehicles, mortgage, loans, credit cards.
Rule of 72 Calculator (doubling time / required rate)
Estimate how long an investment takes to double using the Rule of 72, or solve for the rate needed to double in a given period. Compares against exact compound math.
CAGR Calculator (Compound Annual Growth Rate)
Calculate compound annual growth rate from start value, end value, and number of years. Returns CAGR %, total return %, and multiplier.
Loan Amortization Schedule (full or yearly)
Generate a full month-by-month amortization schedule for any fixed-rate loan. Shows principal/interest split per payment, ending balance, and a CSV export.
Debt-to-Income (DTI) Ratio Calculator
Calculate your front-end and back-end debt-to-income ratios from monthly income and debt payments. See how lenders categorize you.
Life Insurance Needs Calculator (DIME formula)
Calculate how much life insurance you actually need using the DIME method: Debt + Income replacement + Mortgage + Education.
ROAS Calculator (Return on Ad Spend)
Calculate ROAS from revenue and ad spend, plus the profit-adjusted ROAS using gross margin. See breakeven multiple instantly.
Credit Utilization Calculator (per-card and overall)
Calculate your overall credit utilization ratio and per-card ratios. See exactly how lenders score your card balances against limits.
Annuity Payout Calculator (fixed-period)
Calculate the regular payout from an annuity given principal, interest rate, and payout period. Supports monthly or annual distributions.
Mortgage Refinance Calculator (break-even + lifetime savings)
Compare your current mortgage against a refinance offer. See monthly payment change, lifetime interest savings, and the break-even month after closing costs.
Lease vs Buy Calculator (car, total cost over hold period)
Compare leasing and financing a car over your actual hold period. See which is cheaper after factoring loan interest, monthly cash out, and resale value.
Cost of Living Comparison (city to city, equivalent salary)
See what salary you need in a target city to maintain the same lifestyle. Weighted by overall and rent indexes from sources like Numbeo.
Expense Ratio Calculator — True Cost of Investment Fees
See how much expense ratios actually cost you over decades. Compare a 1% fee vs a 0.05% index fund — the gap can exceed your initial investment.
Japan Price Comparison — Rakuten Ichiba
Search and compare product prices on Rakuten Ichiba, sorted cheapest first.
FIRE Number Calculator — Financial Independence Retire Early
Calculate your FIRE number — the total savings needed to retire early. Enter annual expenses, withdrawal rate, and current savings to see how many years to financial independence.
Break-Even Calculator — Units, Revenue & Contribution Margin
Calculate how many units you need to sell to cover your costs. Enter fixed costs, price per unit, and variable cost per unit to find your break-even point instantly.
Electricity Cost Calculator — kWh & Bill Estimator
Enter an appliance's wattage, daily hours of use, and your electricity rate to calculate daily, monthly, and yearly electricity costs.
Meeting Cost Calculator — Real Cost of Meetings
Calculate the true dollar cost of any meeting by attendees, annual salary, and duration.
Paycheck Calculator — 2024 US Federal Take-Home Pay
Calculate your US take-home pay after federal tax, FICA, and state tax estimate. Supports all filing statuses and pay frequencies.
Debt Payoff Calculator — Pay Off Date & Interest
Find your debt-free date or required monthly payment using standard amortization. Works for credit cards, personal loans, and any fixed-rate debt.
Bill Split Calculator — Split Bills & Tip Evenly
Split any restaurant bill evenly or by custom shares. Calculates tip, total, and per-person amount instantly.
House Affordability Calculator — How Much Can You Afford?
Find the maximum home price you can afford using the 28/36 rule, your income, debts, and down payment.
Profit Margin Calculator – Margin & Markup
Calculate profit, profit margin, and markup from cost and revenue.
Sales Commission Calculator - Commission & Net Pay
Calculate sales commission and net amount from a sale value and rate.
Down Payment Calculator for Home Buyers
Calculate your home down payment and remaining loan amount instantly.
Effective Annual Rate Calculator (EAR / APY)
Find the true yearly rate after compounding from a nominal rate.
Cost per Use Calculator
Find out what each use of an item really costs.
Future Value Calculator - Compound Interest FV
Calculate the future value of a lump sum with compound interest.
Present Value Calculator (PV of Future Money)
Calculate the present value of a future amount discounted at a given rate.
Overtime Pay Calculator
Calculate your overtime pay from hours, hourly rate and multiplier.
SIP Calculator — Mutual Fund Maturity Value
Estimate the future value of your monthly SIP investments.
Password Generator (cryptographically secure, with strength meter)
Generate strong random passwords using your browser's secure crypto API. Configurable length, character sets, and ambiguity filter.
Word Counter (with reading and speaking time)
Count words, characters, sentences, paragraphs, plus estimated reading and speaking time. Handles CJK languages correctly.
Case Converter (camel, snake, kebab, Title, etc.)
Convert text into 10 case styles: UPPER, lower, Title, Sentence, camelCase, PascalCase, snake_case, kebab-case, CONSTANT_CASE, and inverted.
Base64 Encoder / Decoder (UTF-8 and URL-safe)
Encode any UTF-8 text to Base64 or decode it back. Toggle URL-safe encoding for use in URLs and JWTs.
JSON Formatter & Minifier (validates and pretty-prints)
Pretty-print or minify JSON. Validates the input and shows a clear error with line and column on failure.
Lorem Ipsum Generator (paragraphs, sentences, words)
Generate placeholder Latin text by paragraphs, sentences, or word count. Optional 'Lorem ipsum' opening line.
URL Encoder / Decoder (percent-encoding, UTF-8 safe)
Encode any text into URL percent-encoding or decode an encoded string back. UTF-8 safe — handles emoji and CJK characters correctly.
Free Roman Numeral Converter 2026 — Numbers 1–3999 (Both Directions)
Free Roman numeral converter. Convert 1–3999 to Roman numerals (I, V, X, L, C, D, M) and back instantly. No signup, works in your browser.
UUID Generator (v4 random, v7 time-ordered)
Generate cryptographically random UUID v4 or time-ordered UUID v7. Bulk-generate up to 100 at a time with one-click copy.
Text Diff Tool (line-level comparison, color-coded)
Compare two blocks of text line by line. Added, removed, and unchanged lines are color-coded with line numbers.
Regex Tester (live matches, groups, replace)
Test JavaScript regular expressions interactively. See live highlighted matches, capture groups, and a replace preview.
Character Frequency Analyzer (letters, all chars, or words)
Count how often each character or word appears in your text. Sortable, with percentages, and optional case sensitivity.
Hash Generator (SHA-1, SHA-256, SHA-384, SHA-512)
Compute SHA-1, SHA-256, SHA-384, and SHA-512 hashes of any UTF-8 text. Browser-native Web Crypto API; nothing leaves your device.
Email Validator (syntax + common typo detection)
Validate email address syntax against RFC 5322 and detect common typos in popular providers (gmail, yahoo, hotmail, etc).
Find and Replace Text (literal or regex, with options)
Replace text with literal find/replace or full regex. Toggle case sensitivity and multi-line mode. Match count shown live.
Markdown to HTML Converter (CommonMark subset)
Convert Markdown to clean HTML in your browser. Supports headings, lists, code blocks, links, images, blockquotes, bold/italic/strikethrough.
HTML to Markdown Converter
Convert HTML to Markdown in your browser. Headings, lists, code, links, images, blockquotes, bold/italic/strikethrough.
Device Info Checker (browser, OS, hardware, network)
See your device's browser, OS, screen, hardware, GPU, storage, network, and dark-mode preferences in one place. All detected client-side.
WPM Typing Speed Test 2026 — Free Words Per Minute Counter
Free WPM typing speed test. Measure words per minute (WPM), CPM, accuracy, and elapsed time live as you type. Color-coded errors, no signup.
URL Slug Generator (SEO-friendly URLs)
Convert any title or sentence into an SEO-friendly URL slug. Configurable separator, length cap, lowercase, and Unicode support.
IPv4 Subnet Calculator (CIDR, mask, hosts)
Calculate network address, broadcast, host range, netmask, wildcard, total/usable hosts from any IPv4 + CIDR. Includes binary representation and class detection.
Password Strength Tester (entropy + crack time)
Test password strength with entropy bits, charset analysis, common-password check, and estimated crack time across attack scenarios.
Caesar Cipher Encoder / Decoder (with ROT13)
Encode or decode text with the classic Caesar cipher. Adjustable shift from -25 to +25, with one-click presets for ROT13 and the historical +3 shift.
JWT Decoder (header, payload, signature, expiry)
Decode any JWT (JSON Web Token) into header, payload, signature parts. Highlights expired tokens. Browser-only — your token never leaves your device.
CSV ↔ JSON Converter (RFC 4180 compliant)
Convert CSV to JSON or JSON to CSV. Configurable delimiter (comma/semicolon/tab/pipe), header-row toggle, RFC 4180 quoted-field handling.
JSON to YAML Converter — Bidirectional
Convert JSON to YAML or YAML to JSON instantly. Edit either side and the other updates automatically. No libraries, fully browser-based.
Reading Level Checker — Flesch Score & Grade Level
Paste text to instantly see Flesch Reading Ease score, Flesch-Kincaid Grade Level, word count, syllable count, and estimated reading time.
Typing Speed Test — WPM & Accuracy
Measure your typing speed in WPM and accuracy with a real-time interactive test. Six rotating passages, live error highlighting, and a results screen.
Unix File Permissions Calculator (chmod)
Toggle read/write/execute checkboxes for owner, group, and other. Instantly see the octal value (755, 644…) and symbolic string (rwxr-xr-x).
Keyboard Key Code Finder — keyCode, code, key Properties
Press any key to instantly see its JavaScript keyCode, code, key, which, and charCode values. Essential for web developers handling keyboard events.
Morse Code Translator — Text to Morse and Back
Translate text to Morse code or decode Morse code back to text. Supports letters, digits, and common punctuation. Free online bidirectional Morse code converter.
ASCII Table — Decimal, Hex, Binary, Octal & Character Chart
Complete ASCII character table showing decimal, hexadecimal, octal, and binary values for all 128 ASCII codes. Filter by printable or control characters and search by number, hex, or character.
Text to Binary Converter — Encode & Decode Binary Code
Convert text to binary code or binary back to readable text. Supports space-separated, newline-separated, or continuous binary output. Swap encode and decode in one click.
HTML Entity Encoder & Decoder — Named, Numeric & Hex
Encode special characters to HTML entities or decode HTML entities back to text. Supports named entities (&), decimal numeric (A), and hex (A) formats.
Text Sorter — Sort Lines Online (A–Z, Z–A, Deduplicate)
Paste any list, sort lines A–Z or Z–A, remove duplicates, and copy the result instantly.
Resistor Color Code Calculator — Decode and Encode Band Colors
Decode resistor color bands to find resistance values, or enter a value to see the matching color bands. Supports 4-band and 5-band resistors.
QR Code Generator — Free, No Login Required
Create a QR code from any text or URL and download it as a PNG — no account needed, runs entirely in your browser.
Duplicate Line Remover — Clean Text Lists Instantly
Remove duplicate lines from any text list. Supports case-insensitive matching, whitespace trimming, and keep-first or keep-last control.
Reverse Text Generator — Flip Characters, Words, or Lines
Reverse any text by characters, words, or lines. Correctly handles Unicode, emoji, and multi-byte characters. Instant copy to clipboard.
Reading Time Calculator – Words to Minutes
Estimate how long a text takes to read at your reading speed.
Color Converter (HEX, RGB, HSL — instant)
Convert colors between HEX, RGB, and HSL with a live preview swatch. Edit any field; the others update.
Contrast Checker (WCAG AA / AAA grades)
Check the color contrast ratio between text and background. Shows live preview and pass/fail badges for WCAG AA and AAA at normal and large text sizes.
CSS Gradient Generator (linear, radial, conic)
Build CSS gradients visually: linear, radial, and conic. Multiple color stops, angle control, presets. Copy ready-to-paste CSS.
Color Palette Generator (5 schemes from one base)
Generate harmonious color palettes from a base color: complementary, analogous, triadic, tetradic, monochromatic. Click any swatch to copy hex.
Color Blindness Simulator — See Colors as Others Do
Enter any hex color and instantly see how it appears to people with deuteranopia, protanopia, tritanopia, and achromatopsia.
CSS Box Shadow Generator (with live preview)
Build CSS box-shadow values visually. Adjust offset, blur, spread, color, opacity, and inset. Live preview, copy-paste CSS.
CSS Color Name Finder — Nearest Named Color from Hex
Enter any hex color to find the closest CSS named color. See the 5 nearest named colors with their exact hex values and distance score.
Color Shades Generator — Tailwind-Style Tints & Shades
Generate 11 tints and shades (50–950) for any color, styled after the Tailwind CSS scale. Click any shade to copy its hex code or export all as CSS custom properties.