Free online calculators and everyday tools
60 calculators and converters for money, health, math, dates, units, text and code. Each one shows its formula and a worked example, works in any currency, and runs entirely in your browser.
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Loan CalculatorWork out the monthly payment, total interest and year-by-year amortization schedule for any fixed-rate personal, car or student loan, in any currency.Mortgage CalculatorEstimate your full monthly mortgage payment, including principal, interest, property tax, insurance, HOA fees and PMI, with a yearly amortization table.Compound Interest CalculatorSee how savings or investments grow with compound interest and regular monthly contributions, with daily, monthly, quarterly or yearly compounding.Simple Interest CalculatorCalculate simple interest on a loan or deposit from the principal, annual rate and time in years, months or days, with a year-by-year breakdown.Savings Goal CalculatorFind how much you need to save each month to reach a savings goal by a target date, counting what you already have and the interest it earns.Retirement CalculatorProject your retirement savings from your age, current balance and monthly contributions, then see the income it could support in today's money.Inflation CalculatorSee what an amount will cost in the future at a given inflation rate, and how much purchasing power your money loses over time, with a yearly table.Salary to Hourly CalculatorConvert pay between hourly, daily, weekly, biweekly, monthly and annual amounts, using your own hours per week and weeks worked per year.ROI CalculatorCalculate return on investment (ROI) as a percentage, the net gain or loss, and the annualized return (CAGR) for investments held for any length of time.Credit Card Payoff CalculatorFind out how long it will take to pay off a credit card balance and how much interest you will pay, or the monthly payment needed to be debt-free by a set date.Sales Tax & VAT CalculatorAdd sales tax, VAT or GST to a net price, or remove it from a gross price to find the amount before tax.Profit Margin CalculatorCalculate gross profit margin and markup from cost and price, or find the selling price that hits a target margin or markup.
BMI CalculatorCalculate your body mass index (BMI) in metric or imperial units, see your WHO weight category and the healthy weight range for your height.BMR CalculatorEstimate your basal metabolic rate, the calories your body burns at complete rest, using the Mifflin-St Jeor equation, with Harris-Benedict for comparison.Calorie Calculator (TDEE)Estimate your total daily energy expenditure (TDEE) and how many calories a day to eat to maintain, lose or gain weight, based on your activity level.Body Fat CalculatorEstimate your body fat percentage with the US Navy method from height, neck, waist and hip measurements, plus fat mass, lean mass and fitness category.Ideal Weight CalculatorEstimate an ideal body weight for your height and sex using the Devine, Robinson, Miller and Hamwi formulas, plus the healthy BMI weight range.Water Intake CalculatorEstimate how much water to drink each day from your body weight, daily exercise and climate, in litres, cups and fluid ounces.Pregnancy Due Date CalculatorEstimate your baby's due date from the first day of your last period, the conception date or an IVF transfer date, and see how many weeks pregnant you are.Running Pace CalculatorCalculate your running pace per kilometre and per mile, your speed, and predicted 5K, 10K, half marathon and marathon times from any race result.
Percentage CalculatorWork out any percentage question: X% of Y, what percent X is of Y, the whole when you know a part, and increasing or decreasing a number by a percent.Percentage Change CalculatorFind the percentage increase or decrease from an old value to a new one, plus the absolute difference, the multiplier and the symmetric percentage difference.Fraction CalculatorAdd, subtract, multiply and divide fractions, with the answer simplified to lowest terms, as a mixed number and as a decimal, plus the working shown.Mean, Median & Mode CalculatorPaste a list of numbers to get the mean, median, mode, range, sum, count, minimum and maximum, plus the sorted data.Ratio CalculatorSolve proportions of the form A : B = C : ?, simplify a ratio to lowest terms, and see the ratio as a decimal and as percentage shares.GPA CalculatorCalculate your semester GPA from letter grades and credit hours on a 4.0 or 4.3 scale, and combine it with a previous GPA to get your cumulative GPA.Quadratic Equation SolverSolve ax² + bx + c = 0 with the quadratic formula.Pythagorean Theorem CalculatorFind the hypotenuse or a missing leg of a right triangle with a² + b² = c², plus its angles, area and perimeter.Standard Deviation CalculatorCalculate the sample or population standard deviation and variance of a data set, with the mean, standard error, coefficient of variation and the steps.Random Number GeneratorGenerate one or many random whole numbers between a minimum and maximum, with or without repeats, using your browser's secure random number generator.
Age CalculatorCalculate your exact age in years, months and days from your date of birth, plus total weeks and days lived and a countdown to your next birthday.Date Difference CalculatorCount the number of days between two dates, and see the difference in weeks, months and years, hours and minutes, with an option to include the end date.Add or Subtract Days from a DateAdd or subtract days, weeks, months or years to or from any date to find the resulting date and its day of the week, such as 90 days from today.Countdown TimerCount down the days, hours, minutes and seconds to any date and time, live.Time Zone ConverterConvert a date and time from one time zone to another, with daylight saving handled automatically, and see the same moment in major world cities.Working Days CalculatorCount the working days between two dates, excluding weekends and any public holidays you list, for project plans, notice periods and delivery times.
Length ConverterConvert length and distance between metres, centimetres, millimetres, kilometres, inches, feet, yards, miles and nautical miles, with every unit at once.Weight ConverterConvert weight and mass between kilograms, grams, pounds, ounces, stone, metric tonnes, US and UK tons, troy ounces and carats, all units at once.Temperature ConverterConvert temperatures between Celsius, Fahrenheit, Kelvin and Rankine, with the formula and reference points for freezing, body temperature and boiling.Area ConverterConvert area between square metres, square feet, square yards, acres, hectares, square kilometres, square miles and more.Volume ConverterConvert volume between litres, millilitres, cubic metres, US and UK gallons, quarts, pints, cups, fluid ounces, tablespoons, teaspoons and cubic feet.Speed ConverterConvert speed between kilometres per hour, miles per hour, metres per second, knots, feet per second and Mach, with all units shown together.Cooking Measurement ConverterConvert recipe measurements between cups, tablespoons, teaspoons, millilitres, grams and ounces, with ingredient densities for flour, sugar, butter and more.Data Storage ConverterConvert data sizes between bits, bytes, kilobytes, megabytes, gigabytes and terabytes in both decimal (GB) and binary (GiB) units, plus megabits and gigabits.Time Unit ConverterConvert time durations between nanoseconds, milliseconds, seconds, minutes, hours, days, weeks, months, years, decades and centuries.Fuel Economy ConverterConvert fuel economy between miles per gallon (US and UK), litres per 100 km, kilometres per litre and miles per litre, with CO₂ per km for petrol.
Word CounterCount words, characters with and without spaces, sentences, paragraphs and lines, and estimate reading and speaking time.Case ConverterChange text to UPPERCASE, lowercase, Title Case, Sentence case, camelCase, snake_case, kebab-case and more in one click.Remove Duplicate LinesRemove duplicate lines from a list or text while keeping the original order.Sort LinesSort a list of lines alphabetically A to Z or Z to A, numerically, naturally (2 before 10), by length or in reverse order.Lorem Ipsum GeneratorGenerate lorem ipsum placeholder text by paragraphs, sentences or words, optionally wrapped in HTML paragraph tags, for mockups, layouts and design drafts.Text Compare (Diff Checker)Compare two versions of a text line by line and highlight added, removed and unchanged lines.
JSON Formatter & ValidatorFormat, validate and minify JSON.Base64 Encoder & DecoderEncode text to Base64 or decode Base64 back to text, with full UTF-8 support for accents and emoji, and an option for URL-safe Base64 (Base64url).Password GeneratorGenerate strong random passwords with a secure generator in your browser.UUID GeneratorGenerate random version 4 UUIDs or time-ordered version 7 UUIDs (GUIDs) in bulk, in lowercase or uppercase, with or without hyphens.Color ConverterConvert colors between HEX, RGB, HSL, HSV and CMYK, preview the color, and check its WCAG contrast ratio against white and black text.
Discount CalculatorFind the sale price after a percentage discount, including an extra stacked discount and sales tax, and see exactly how much you save.Tip CalculatorCalculate the tip and total for a restaurant bill and split it evenly between any number of people, with optional rounding up per person.Fuel Cost CalculatorEstimate the fuel cost of a car journey from the distance, your car's fuel economy and the fuel price, in km or miles, litres or gallons, and split it per person.
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Answers you can check
Every tool page explains the method, prints the formula and walks through an example, so you can see exactly where a number comes from instead of trusting a black box.
Private by design
Calculations run on your own device. Nothing you type, from salaries to passwords, is sent to a server, saved or shared.
Shareable results
The address bar updates as you type, so Copy link gives you a link that reopens the tool with the same inputs for a colleague, client or friend.
Works anywhere
Pages are fast, light and built for phones as well as desktops, in light or dark mode, with any currency and metric or imperial units.