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Best Free Online Unit & Measurement Converters

Convert anything to anything, instantly. Length, weight, temperature, area, volume, speed, data storage and dozens of single-pair conversions like cm to inches and kg to lbs, each on its own fast page. No ads, no sign-up, and it works the moment you type. All 62 tools below are free, run in your browser, and need no sign-up.

Length ConverterConvert between millimeters, centimeters, meters, kilometers, inches, feet, yards, and miles instantly as you type.Weight / Mass ConverterConvert between grams, kilograms, metric tonnes, ounces, pounds, and stones instantly with exact factors as you type.Temperature ConverterConvert between Celsius, Fahrenheit, and Kelvin instantly with correct offset formulas, updating live as you type a value.Volume ConverterConvert between milliliters, liters, US and imperial gallons, quarts, pints, cups, and fluid ounces instantly as you type.Area ConverterConvert between square meters, square feet, square kilometers, acres, hectares, square miles, and more instantly as you type.Speed ConverterConvert between meters per second, km/h, mph, knots, and feet per second instantly with exact factors, updating live as you type.Time ConverterConvert between seconds, minutes, hours, days, weeks, months, and years instantly with exact factors, updating live as you type.Data Storage ConverterConvert between bytes, KB, MB, GB, TB, and PB using decimal (1000) or binary (1024) units, live as you type.Pressure ConverterConvert between pascals, kilopascals, bar, psi, atmospheres, mmHg, and torr instantly with exact factors, live as you type.Energy ConverterConvert between joules, kilojoules, calories, kilocalories, watt-hours, kilowatt-hours, and BTU instantly as you type.Power ConverterConvert between watts, kilowatts, megawatts, horsepower (metric and mechanical), and BTU per hour instantly as you type.Fuel Economy ConverterConvert between miles per gallon (US and UK) and liters per 100 km using the correct reciprocal formula, live as you type.Angle ConverterConvert between degrees, radians, gradians, arcminutes, arcseconds, and full turns instantly with exact factors, live as you type.Cooking / Recipe ConverterConvert between cups, tablespoons, teaspoons, fluid ounces, and milliliters for recipes instantly as you type.Shoe Size ConverterConvert US, UK, EU, and centimeter shoe sizes for men and women using standard sizing tables, updating live as you type.Frequency ConverterConvert between hertz, kilohertz, megahertz, gigahertz, and RPM instantly with exact factors, updating live as you type.CM to Inches ConverterConvert centimeters to inches instantly using the exact factor (1 inch = 2.54 cm). Live result as you type, no sign-up.KG to LBS ConverterConvert kilograms to pounds instantly using the exact factor (1 kg = 2.2046226218 lb). Live result as you type, no sign-up.Celsius to Fahrenheit ConverterConvert C to F instantly using the correct formula (F = C x 9/5 + 32). Live result as you type, no sign-up.Feet to CM ConverterConvert feet to centimeters instantly using the exact factor (1 ft = 30.48 cm). Live result as you type, no sign-up.Meters to Feet ConverterConvert meters to feet instantly using the exact factor (1 m = 3.280839895 ft). Live result as you type, private.KM to Miles ConverterConvert kilometers to miles instantly using the exact factor (1 km = 0.6213711922 mi). Live result as you type, private.ML to OZ ConverterConvert milliliters to US fluid ounces instantly (1 fl oz = 29.5735 mL). Live result as you type, no sign-up, private.MM to Inches ConverterConvert millimeters to inches instantly using the exact factor (1 inch = 25.4 mm). Live result as you type, private.Liters to Gallons ConverterConvert liters to US gallons instantly (1 US gallon = 3.785411784 L). Live result as you type, no sign-up, private.Celsius to Kelvin ConverterConvert C to K instantly using the exact offset (K = C + 273.15). Live result as you type, no sign-up, private.Roman Numeral ConverterConvert numbers to Roman numerals and Roman numerals back to numbers instantly, both directions, live as you type.Decimal to Binary ConverterConvert decimal numbers to binary instantly with input validation, updating live as you type. No sign-up, private.Hex to Decimal ConverterConvert hexadecimal numbers to decimal instantly with input validation, updating live as you type. No sign-up, private.KPH to MPH ConverterConvert kilometers per hour to miles per hour instantly (1 mph = 1.609344 km/h). Live result as you type, no sign-up.Pounds to KG ConverterConvert pounds to kilograms instantly using the exact factor (1 lb = 0.45359237 kg). Live result as you type, no sign-up.OZ to Grams ConverterConvert ounces to grams instantly using the exact factor (1 oz = 28.349523125 g). Live result as you type, no sign-up.Cups to ML ConverterConvert US cups to milliliters instantly using the exact factor (1 cup = 236.5882365 mL). Live result as you type, private.Tablespoons to ML ConverterConvert US tablespoons to milliliters instantly (1 tbsp = 14.7868 mL). Live result as you type, no sign-up, private.Teaspoons to ML ConverterConvert US teaspoons to milliliters instantly (1 tsp = 4.9289 mL). Live result as you type, no sign-up, private.Stone to LBS ConverterConvert stone to pounds instantly using the exact factor (1 stone = 14 lb). Live result as you type, no sign-up, private.Stone to KG ConverterConvert stone to kilograms instantly using the exact factor (1 stone = 6.35029318 kg). Live result as you type, private.Fluid Ounces to ML ConverterConvert US fluid ounces to milliliters instantly (1 fl oz = 29.5735 mL). Live result as you type, no sign-up, private.MB to GB ConverterConvert megabytes to gigabytes instantly using decimal units (1 GB = 1000 MB). Live result as you type, no sign-up, private.KB to MB ConverterConvert kilobytes to megabytes instantly using decimal units (1 MB = 1000 KB). Live result as you type, no sign-up, private.GB to TB ConverterConvert gigabytes to terabytes instantly using decimal units (1 TB = 1000 GB). Live result as you type, no sign-up, private.Bytes to KB ConverterConvert bytes to kilobytes instantly using decimal units (1 KB = 1000 bytes). Live result as you type, no sign-up, private.Watts to Horsepower ConverterConvert watts to mechanical horsepower instantly (1 hp = 745.7 W). Live result as you type, no sign-up, private.Bar to PSI ConverterConvert bar to pounds per square inch instantly (1 bar = 14.5038 psi). Live result as you type, no sign-up, private.Pascal to PSI ConverterConvert pascals to pounds per square inch instantly (1 psi = 6894.76 Pa). Live result as you type, no sign-up, private.Square Meters to Square Feet ConverterConvert m2 to ft2 instantly (1 m2 = 10.7639 ft2). Live result as you type, no sign-up, private.Hectares to Acres ConverterConvert hectares to acres instantly (1 hectare = 2.47105 acres). Live result as you type, no sign-up, private.Knots to MPH ConverterConvert knots to miles per hour instantly (1 knot = 1.15078 mph). Live result as you type, no sign-up, private.Tons to Pounds ConverterConvert US short tons to pounds instantly using the exact factor (1 ton = 2000 lb). Live result in your browser as you type.Ounces to Grams ConverterConvert ounces to grams instantly using the exact factor (1 oz = 28.349523125 g). Live result in your browser as you type.Teaspoons to Tablespoons ConverterConvert tsp to tbsp instantly using the exact ratio (1 tbsp = 3 tsp). Live result in your browser as you type.Gallons to Cups ConverterConvert US gallons to cups instantly using the exact ratio (1 gallon = 16 cups). Live result in your browser as you type.Quarts to Liters ConverterConvert US quarts to liters instantly using the exact factor (1 quart = 0.946352946 L). Live result in your browser as you type.Pints to Milliliters ConverterConvert US pints to mL instantly using the exact factor (1 pint = 473.176473 mL). Live result in your browser as you type.Yards to Feet ConverterConvert yards to feet instantly using the exact ratio (1 yard = 3 feet). Live result in your browser as you type.Miles to Feet ConverterConvert miles to feet instantly using the exact ratio (1 mile = 5280 feet). Live result in your browser as you type.Bits to Bytes ConverterConvert bits to bytes instantly using the exact ratio (1 byte = 8 bits). Live result in your browser as you type.Megabits to Megabytes ConverterConvert Mbps to MB per second instantly (8 bits = 1 byte). Live result in your browser as you type.Degrees to Radians ConverterConvert degrees to radians instantly using the exact factor (pi/180). Live result in your browser as you type.Celsius to Rankine ConverterConvert C to Rankine instantly using the correct formula (R = C x 1.8 + 491.67). Live result in your browser as you type.Fahrenheit to Kelvin ConverterConvert F to K instantly using the correct formula (K = (F - 32) x 5/9 + 273.15). Live result in your browser as you type.ATM to PSI ConverterConvert atmospheres to pounds per square inch instantly (1 atm = 14.6959 psi). Live result as you type, no sign-up.

Frequently asked questions

Are these tools free?

Yes. Every tool in this toolkit is completely free, with no sign-up and no usage limits.

Do these tools work on mobile?

Yes. They run in any modern web browser on phone, tablet or desktop, with nothing to install.

Is my data private?

Yes. These tools run entirely in your browser, so nothing you enter is uploaded to a server.

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