Converters & Calculators
Unit and currency converters, salary, zakat, loan and health calculators, time-zone and calendar tools and random pickers, all free.
Unit converters
- Unit ConverterConvert length, weight, area, volume, temperature, speed, pressure, energy, power, data, fuel economy and time with exact factors.
- Weight ConverterKilograms, pounds, ounces, stone, grams, tonnes, short and long tons, troy ounces and carats, converted both ways.
- Length ConverterMillimetres, centimetres, metres, kilometres, inches, feet, yards, miles and nautical miles, converted both ways.
- Area ConverterSquare feet, square metres, acres, hectares, square yards, square miles and square kilometres, converted both ways.
- Volume ConverterLitres, millilitres, US and imperial gallons, pints, fluid ounces, cups, spoons, cubic feet and cubic metres.
- Temperature ConverterCelsius, Fahrenheit, Kelvin and Rankine, converted with the exact offset formulas and a common-values table.
- Speed Converterkm/h, mph, metres per second, knots and feet per second, converted both ways with exact factors.
- Pressure Converterpsi, bar, kPa, hPa/mbar, atmospheres, mmHg, torr, inHg and kgf/cm², for tyres, weather, blood pressure and engineering.
- Energy ConverterJoules, kilojoules, calories and kilocalories, watt-hours and kWh, BTU, foot-pounds and electronvolts.
- Power ConverterWatts, kilowatts, megawatts, mechanical and metric horsepower, BTU per hour, kcal per hour and tons of refrigeration.
- Data Storage ConverterBytes, kB/MB/GB/TB (decimal) and KiB/MiB/GiB/TiB (binary), plus bits, kilobits, megabits and gigabits.
- Fuel Economy ConverterMiles per gallon (US and UK), litres per 100 km and kilometres per litre, converted with the correct reciprocal formulas.
- Time Unit ConverterNanoseconds to centuries: seconds, minutes, hours, days, weeks, average months and Gregorian years.
- kg to lbsConvert kilograms to pounds with the exact factor (1 kg = 2.20462 lb), plus a table from 0.5 to 100 kg.
- lbs to kgConvert pounds to kilograms with the exact definition (1 lb = 0.45359237 kg), plus a table from 1 to 250 lb.
- cm to inchesConvert centimetres to inches (1 in = 2.54 cm exactly), with a quick-reference table up to 150 cm.
- inches to cmConvert inches to centimetres (× 2.54 exactly), with a table covering fractions of an inch and common screen sizes.
- feet to metersConvert feet to metres (1 ft = 0.3048 m exactly), with a table from 1 to 10,000 ft.
- meters to feetConvert metres to feet (divide by 0.3048), with a table from 1 m to 1000 m.
- km to milesConvert kilometres to miles (÷ 1.609344), with race distances from 5K to the marathon.
- miles to kmConvert miles to kilometres (× 1.609344 exactly), with a table from 1 to 1000 miles.
- Celsius to FahrenheitConvert °C to °F with the exact formula (× 9/5 + 32), plus a table of weather, body and oven temperatures.
- Fahrenheit to CelsiusConvert °F to °C with the exact formula ((°F − 32) × 5/9), plus a table of weather, body and oven temperatures.
- liters to gallonsConvert litres to US gallons (÷ 3.785411784) or imperial gallons (÷ 4.54609), with a quick-reference table.
- grams to ouncesConvert grams to avoirdupois ounces (÷ 28.349523125), with a table for cooking and postage weights.
- ounces to gramsConvert ounces to grams (× 28.349523125 exactly), with a table from ¼ oz to 2 lb.
- mph to km/hConvert miles per hour to kilometres per hour (× 1.609344), with a table of common speed limits.
- square feet to square metersConvert sq ft to m² (× 0.09290304 exactly), with a table of apartment and house sizes.
- Feet and inches to cmConvert a height in feet and inches to centimetres and back, with a table from 4 ft 6 in to 7 ft.
- Cups to Grams ConverterConvert cups, tablespoons and teaspoons to grams or ounces (and back) for 50 common baking and cooking ingredients.
- Shoe Size ConverterConvert men's, women's and children's shoe sizes between US, UK, EU and foot length in cm (Mondopoint), with full charts.
- Ring Size ConverterConvert ring sizes between US/Canada, UK/Australia letters, ISO 8653 (EU) circumference and inner diameter in mm.
- Clothing Size ConverterApproximate women's and men's clothing sizes across US, UK, EU, France, Italy and Japan, with the full tables.
Calculators
- UAE Gratuity CalculatorEnd-of-service gratuity under Federal Decree-Law 33/2021: 21 days per year for 5 years, 30 days after, capped at 2 years.
- Saudi End-of-Service CalculatorEnd-of-service award under Saudi Labor Law Articles 84 and 85, including the resignation reductions.
- Zakat Calculator2.5% of cash, gold, silver, trade goods and receivables minus short-term debts, checked against the nisab you enter.
- Loan EMI CalculatorMonthly instalment, total interest and an amortisation schedule for any loan from principal, rate and term.
- BMI CalculatorBody mass index in metric or imperial units with the WHO adult categories and the weight range for a normal BMI.
- VAT CalculatorAdd or remove VAT at 5%, 15%, 20% or a custom rate and see net, VAT and gross amounts.
- Percentage CalculatorWhat is X% of Y, X is what percent of Y, and the percentage change from X to Y, with the formula shown.
- Date Difference CalculatorDays, weeks, months and business days between two dates, or add and subtract days, with Mon–Fri or Sun–Thu work weeks.
- Food Calorie CalculatorSearch 600+ foods from USDA data or type a meal like “2 eggs, 1 cup rice” and get calories, protein, carbs and fat with running totals.
- Calorie CalculatorDaily calories to maintain, lose or gain weight from the Mifflin–St Jeor equation, with BMR, TDEE and macros in grams.
- Age CalculatorExact age in years, months and days from a date of birth, with total days and hours, the weekday you were born, next-birthday countdown and Hijri birthday.
- GPA CalculatorCredit-weighted GPA on a 4.0 or 4.3 scale or from percentages, cumulative GPA with previous credits, the grade you need for a target, and UK degree classes.
- Tip CalculatorTip amount and total for any bill, split between any number of people, with tip before or after tax and shares rounded up.
- Split Bill CalculatorSplit an itemised bill fairly: assign items to people, share some between everyone, add service and VAT in proportion, and see who pays whom.
- Discount CalculatorSale price after a % discount, stacked “extra % off” deals, the original price from a sale price, and how much you save, with optional VAT.
- Fuel Cost CalculatorTrip fuel cost from distance, your car’s consumption (L/100 km, km/L or MPG) and the fuel price, with round trips and a split between passengers.
- Time Duration CalculatorHours and minutes between two times (overnight shifts included), add or subtract time, total a timesheet and convert decimal hours to h:mm.
- Currency ConverterConvert between 36 currencies with European Central Bank reference rates, plus the official fixed pegs for the UAE dirham, Saudi riyal and other Gulf currencies.
- Pregnancy Due Date CalculatorEstimated due date from your last period (any cycle length), conception date or IVF transfer, with weeks pregnant, trimester and key dates.
- Ovulation CalculatorEstimate ovulation, the fertile window and the next period from the first day of your last period and your cycle length, for the next 3 to 6 cycles.
Time & date
- Countdown TimerCount down to a date and time or run a timer for a set duration, with a beep at zero, the time left in the tab title and a shareable link.
- StopwatchStart, pause, lap and reset, with a laps table that marks the fastest and slowest lap. Timed with the browser's monotonic clock.
- Pomodoro TimerFocus timer with work sessions, short and long breaks and a set length you choose, plus optional sound and desktop notifications.
- World ClockLive local time in the cities you choose, with UTC offsets, daylight saving status and the difference from your own clock.
- Time Zone ConverterConvert a date and time in one city to several other cities at once, with correct daylight saving time on both sides.
- Meeting PlannerFind meeting hours that fall inside working time for 2 to 6 cities, with Mon–Fri or Sun–Thu working weeks and DST handled.
- Hijri Date ConverterConvert Gregorian dates to Hijri and Hijri dates to Gregorian using the Umm al-Qura calendar of Saudi Arabia, with month lengths and weekdays.
- Chinese Calendar ConverterConvert a Gregorian date to the Chinese lunisolar date with leap months, the sexagenary year, zodiac animal and element, and nearby Chinese New Year dates.
- Prayer TimesFajr, sunrise, Dhuhr, Asr, Maghrib and Isha for any listed city or your location, with five calculation methods, Hanafi Asr and a 7-day table.
Random pickers
- Random Number GeneratorUniform random integers in any range from crypto.getRandomValues, one or many, with or without repeats.
- Spinner WheelSpin a wheel of names or options: up to 200 entries, remove winners after each spin, keep a history and share the wheel by link.
- Dice RollerRoll 1 to 10 dice of type d4, d6, d8, d10, d12, d20 or d100 and see each die, the total and a roll history.
- Coin FlipFlip a fair coin once, or flip up to 1,000 coins at once and see the heads/tails tally, percentages and longest streak.
- Random Name PickerPaste a list of names and draw one or several winners without repeats, optionally excluding people who already won.
- Random Team GeneratorSplit a list of names into a set number of teams or teams of a given size, with balanced sizes and optional fixed captains.
Convert units, sizes and currencies; work out end-of-service gratuity, zakat, VAT, loan payments, percentages, ages and due dates; plan across time zones, convert Hijri dates, and pick names or spin a wheel fairly.
Every calculator shows its formula and assumptions, and the legal ones cite the official source they follow.