All calculators and converters
109 free tools, grouped by topic. Use the search box at the top for anything else.
Unit Converters
- Angle Converter: Convert degrees, radians, gradians, mils and DMS.
- Area Converter: Convert square feet, square meters, acres, hectares and marla.
- Cooking Converter: Cups, spoons and mL to grams for flour, sugar, butter and more.
- Data Storage Converter: Convert bytes, KB, MB, GB and TB, decimal or binary.
- Data Transfer Rate Converter: Convert Mbps to MB/s, Gbps, KiB/s and other data speeds.
- Density Calculator: Find density, mass or volume from the other two.
- Energy Converter: Convert joules, calories, kWh, BTU and therms.
- Force Converter: Convert newtons, pounds-force, kilograms-force, kips and dynes exactly.
- Frequency Converter: Convert hertz, kHz, MHz, GHz and rpm, exactly.
- Fuel Economy Converter: Convert US mpg, UK mpg, L/100 km and km/L.
- Height Converter: Convert cm or meters to feet and inches, and back.
- Length Converter: Convert cm, inches, feet, meters, miles and more, exactly.
- Number Base Converter: Convert whole numbers between binary, decimal, hex, octal and any base.
- Number to Words Converter: Spell out any number in English words, or write a cheque amount.
- Power Converter (W, kW, HP): Convert watts, kilowatts, horsepower, PS and BTU/h.
- Pressure Converter: Convert psi, bar, kPa, atm, mmHg and inHg.
- Roman Numeral Converter: Convert numbers to Roman numerals and back, with the working.
- Shoe Size Converter: Convert adult shoe sizes between US, UK and EU, or foot length.
- Speed Converter: Convert mph, km/h, m/s, knots and ft/s instantly.
- Temperature Converter: Convert Celsius, Fahrenheit, Kelvin and Rankine, with the formula.
- Time Unit Converter: Convert seconds, minutes, hours, days, weeks, months and years.
- Torque Converter: Convert newton meters, pound-feet, inch-pounds and kgf·m exactly.
- Volume Converter: Convert liters, gallons, cups and fluid ounces, US and UK.
- Weight Converter: Convert kg, pounds, ounces, grams and stone, exactly.
Date & Time Calculators
- Age Calculator: Your exact age in years, months and days, plus birthday countdown.
- Business Days Calculator: Count working days between dates, or add business days.
- Date Calculator: Add or subtract days, weeks, months or years from any date.
- Day of the Week Calculator: Find the weekday for any date, past or future.
- Days Between Dates Calculator: Count the days between two dates, plus weeks, months and years.
- Days Until Calculator: Count down the days to any date or holiday.
- Hours Calculator: Hours and minutes between two times, including overnight shifts.
- Military Time Converter: Convert 12-hour times to military time and back, one or many.
- Sunrise and Sunset Calculator: Sunrise, sunset, day length and twilight for any place and date.
- Time Calculator: Add or subtract hours, minutes and seconds, or from a clock time.
- Time Card Calculator: Add up a week of hours, breaks, overtime and pay.
- Time Zone Converter: Convert a date and time between any two time zones.
- Unix Timestamp Converter: Convert Unix (epoch) time to a date, and back again.
- Week Number Calculator: Find the ISO week number of any date, or a week’s dates.
Health & Fitness Calculators
- BMI Calculator: Check your body mass index in metric or imperial units.
- BMR Calculator: Estimate the calories your body burns at complete rest.
- Body Fat Calculator: Estimate body fat percentage with a tape measure and your height.
- Calorie Calculator: Estimate daily calories to maintain, lose or gain weight.
- Calories Burned Calculator: Estimate calories burned for 40 activities from your weight and time.
- Due Date Calculator: Estimate your baby’s due date and how far along you are.
- Heart Rate Zone Calculator: Find your maximum heart rate and five training zones in bpm.
- Ideal Weight Calculator: Compare four classic ideal weight formulas with the healthy BMI range.
- Macro Calculator: Turn your calorie target into daily grams of protein, carbs and fat.
- One Rep Max Calculator: Estimate your 1RM from a set of 10 reps or fewer.
- Ovulation Calculator: Estimate your fertile window, ovulation day and next period.
- Running Pace Calculator: Find your pace, finish time or distance in km or miles.
- Water Intake Calculator: Estimate your daily water needs from official reference intakes.
Finance Calculators
- Auto Loan Calculator: Car payment with trade-in, sales tax, fees and a full schedule.
- CAGR Calculator: Find the steady yearly growth rate between two values.
- Compound Interest Calculator: See how savings grow with compounding and monthly contributions.
- Credit Card Payoff Calculator: See how long your card takes to clear, or what to pay.
- Currency Converter: Convert between 35 currencies at the latest daily reference rates.
- Discount Calculator: Sale price, savings, discount percentage and stacked discounts.
- Electricity Cost Calculator: What an appliance costs to run per day, month and year.
- FD Calculator (Fixed Deposit): Fixed deposit maturity and interest with quarterly compounding.
- Fuel Cost Calculator: Trip fuel cost from distance, fuel economy and fuel price.
- GST Calculator: Add or remove GST, with India’s CGST, SGST and IGST split.
- Inflation Calculator: What past dollars are worth today, using official US CPI data.
- Loan & EMI Calculator: Monthly payment (EMI), total interest and full repayment schedule.
- Mortgage Calculator: Monthly payment with tax, insurance, PMI and HOA, plus full schedule.
- Percentage Calculator: Percent of a number, percentage change, increases, decreases and more.
- Profit Margin Calculator: Find profit, margin and markup, or the price for a target.
- Retirement Calculator: Project your retirement savings and see how long they could last.
- ROI Calculator: Return on investment, gain and annualized ROI in one place.
- Salary Converter: Hourly, Weekly, Monthly, Yearly: Convert hourly pay to salary and back, for any pay period.
- Sales Tax Calculator: Add sales tax to a price, or find the price before tax.
- Savings Goal Calculator: How much to save each month to reach your goal on time.
- Simple Interest Calculator: Find simple interest, principal, rate or time, in years, months or days.
- SIP Calculator: Estimate mutual fund SIP, step-up SIP and lumpsum returns.
- Tip Calculator: Work out the tip, the total and each person’s share.
- Unit Price Calculator: Compare products by price per gram, ounce, litre or item.
- VAT Calculator: Add or remove VAT at any rate, with UK and EU presets.
- Zakat Calculator: Work out Zakat on your savings, gold and silver.
Math Calculators
- Average Calculator: Mean, median, mode and range of any list of numbers.
- Decimal to Fraction Calculator: Turn any decimal, even a repeating one, into a fraction.
- Exponent Calculator: Raise any number to any power, including negative and fractional exponents.
- Final Grade Calculator: Find the score you need on your final exam.
- Fraction Calculator: Add, subtract, multiply and divide fractions and mixed numbers.
- GCF and LCM Calculator: Find the GCF and LCM of 2–6 numbers, with full working.
- GPA Calculator: Work out your semester and cumulative GPA on the 4.0 scale.
- Grade Calculator: Weighted class grade and letter grade from your scores.
- Percent Error Calculator: Percent, absolute and relative error from measured and true values.
- Prime Number Calculator: Check if a number is prime and find its prime factors.
- Probability Calculator: Two independent events, repeated trials and binomial probabilities, with steps.
- Quadratic Formula Calculator: Find the roots, discriminant and vertex, with steps.
- Random Number Generator: Pick fair random whole numbers, with or without repeats.
- Ratio Calculator: Simplify ratios, solve proportions and split totals in a ratio.
- Rounding Calculator: Round to decimal places, significant figures or any nearest increment.
- Scientific Calculator: Trig, logs, powers, roots and factorials, in degrees or radians.
- Scientific Notation Calculator: Convert numbers to scientific, E and engineering notation, and back.
- Significant Figures Calculator: Count significant figures and round any number to n sig figs.
- Square Root Calculator: Square, cube and nth roots, with the simplified radical form.
- Standard Deviation Calculator: Sample and population standard deviation, variance and every step.
Text Tools
- Case Converter: Change text to UPPER, lower, Title, Sentence, camelCase and more.
- Character Counter: Count characters and bytes, and check X, SMS and other limits.
- Lorem Ipsum Generator: Placeholder text by paragraphs, sentences or words, ready to copy.
- Word Counter: Count words, characters, sentences and reading time as you type.
Developer Tools
- Base64 Encode & Decode: Encode text or files to Base64 and decode it back, privately.
- Color Converter: Convert HEX, RGB, HSL, HSV and CMYK colors and check contrast.
- IP Subnet Calculator: Network, broadcast, host range and mask for any IPv4 or IPv6 prefix.
- JSON Formatter & Validator: Format, validate and minify JSON, with exact line and column errors.
- Password Generator: Strong random passwords and passphrases, made privately in your browser.
- QR Code Generator: Make a free static QR code for any link or text.
- URL Encode & Decode: Percent-encode or decode text and links, and read query strings.
- UUID Generator: Make v4 or v7 UUIDs in bulk, and inspect any UUID.