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Fast, free, privacy-friendly calculators, converters and text utilities that run right in your browser.
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Age Calculator Enter a date of birth to get the exact age in years, months and days, with totals in days and weeks. BMI Calculator Enter your height and weight to get your BMI, the WHO weight category, and the healthy weight range for your height. Descriptive Statistics Calculator Paste a list of numbers to get the count, sum, mean, median, mode, range, variance and standard deviation. GPA Calculator Add your courses with their letter grade and credits to get your weighted GPA on a 4.0 scale. Length Converter Enter a length in any unit to see it converted to metric and imperial units at once. Number Base Converter Enter a value and its base to see it in binary, octal, decimal and hexadecimal at once. Password Generator Create secure random passwords with your choice of length and character types, generated locally in your browser. Percentage Calculator Three percentage calculators in one — find a percentage of a number, a ratio as a percentage, and percentage change. Temperature Converter Enter a temperature in any unit to see the equivalent in Celsius, Fahrenheit and Kelvin at the same time. Tip Calculator Enter the bill, choose a tip percentage and split it — see the tip, total and amount per person instantly. Word Counter Paste your text to see live word, character, sentence and paragraph counts — plus an estimated reading time. BMR Calculator Enter your sex, weight, height and age to estimate the calories your body needs at complete rest. Case Converter Paste text and instantly see it in every common letter case, each with a one-click copy button. Weight & Mass Converter Enter a weight in any unit to see it in metric and imperial units at once. Sales Tax Calculator Add sales tax to a net price, or extract the net amount and tax from a tax-inclusive total. T-Test Calculator Enter your data to compute a t-test — one-sample, independent two-sample (Welch) or paired — with the t value, df and p-value. Average Calculator Calculate the mean, median, mode, range, sum and count of any list of numbers. JSON Formatter & Validator Paste JSON to pretty-print it with indentation, minify it to one line, or check that it's valid. Business Days Calculator Count working days between two dates, skipping weekends and any holidays you list. Compound Interest Calculator Project the future value of savings or investments with compound interest and optional regular deposits. Countdown Timer Set a duration and count down to zero, with start, pause and reset controls. Dice Roller Roll any combination of dice with an optional modifier, using fair, unbiased randomness. Fraction Calculator Enter two fractions and an operation to get a simplified result, with decimal and mixed-number forms. Hash Generator Generate SHA-1, SHA-256, SHA-384 and SHA-512 hashes of any text, computed locally in your browser. Percentile Calculator Find the value at any percentile in your data, with quartiles and the interquartile range. Word Frequency Counter Paste text to rank the most common words with their counts and share of the total. Mortgage Amortization Calculator Calculate your monthly mortgage payment and a full amortization schedule of principal and interest. Random Picker Pick one or more random winners from a list of entries, with fair, unbiased draws. Regex Tester Test a regular expression against text and see all matches, capture groups and positions live. Text Diff Checker Compare two texts line by line and see added and removed lines highlighted, with a change count. Loan & Mortgage Calculator Enter a loan amount, interest rate and term to see the monthly payment and the total interest you'll pay. Calories Burned Calculator Estimate calories burned during exercise from the activity, your body weight and the duration. Cooking Temperature Converter Convert oven temperatures between Celsius, Fahrenheit and gas mark, with the fan-oven setting. Hours Calculator Calculate worked hours between two times, minus a break, with optional pay at an hourly rate. Pomodoro Timer Work in focused sessions with short and long breaks using a customisable Pomodoro timer. Paint Calculator Estimate the litres of paint a room needs from its size, coats and coverage, minus openings.