Unit Converters
38 calculators
Unit Conversion
Convert length, weight, area, volume, temperature and time between metric, US and imperial units, with results in your chosen units. Choose a quantity, enter a value and select the source and destination units. The preview rounds to four decimal places, so very small results may display as zero; open the full converter for precision options and conversion details. US and imperial gallons are different units: choose the labeled option that matches your measurement.
- Acceleration Converter Convert between metres per second squared, standard gravity, feet per second squared and gals.
- Acres to Hectares Converter Convert acres to hectares and hectares back to acres, with square metres and square feet.
- Angle Converter Convert between degrees, radians, gradians and turns.
- Area Converter Convert between square metres, square feet, square yards, acres, hectares and more.
- CM to Inches Converter Convert centimetres to inches and inches back to centimetres.
- HEX to HSL Converter Convert a three- or six-digit sRGB hex code to HSL and RGB values.
- RGB to HEX Converter Convert three comma-separated sRGB channels (0–255) to a HEX code and relative luminance.
- Cups to ML Converter Convert US or metric cups to millilitres, and millilitres back to cups.
- Ounces to Grams Converter Convert ounces to grams and grams back to ounces for cooking and baking.
- Data Storage Converter Convert between bytes, kilobytes, megabytes, gigabytes and terabytes in both binary and decimal units.
- Density Calculator Calculate density from mass and volume, and see it in kg/m³, g/cm³ and lb/ft³.
- Electric Current Converter Convert between amperes, milliamperes, microamperes and kiloamperes.
- Energy Converter Convert between joules, kilojoules, calories, kilocalories, watt-hours, kilowatt-hours and BTU.
- Fahrenheit to Celsius Converter Convert Fahrenheit to Celsius or Celsius to Fahrenheit, with the working shown as a formula.
- Flow Rate Converter Convert between litres per second, litres per minute, cubic metres per hour and US gallons per minute.
- Force Converter Convert between newtons, kilonewtons, kilogram-force, pound-force and dynes.
- Frequency Converter Convert between hertz, kilohertz, megahertz and gigahertz, and get the equivalent period and wavelength.
- MPG Calculator Convert miles per gallon to litres per 100 km, km per litre and UK MPG.
- KG to LBS Converter Convert kilograms to pounds and pounds back to kilograms, with stones for good measure.
- KM to Miles Converter Convert kilometres to miles and miles back to kilometres.
- Length Converter Convert between millimetres, centimetres, metres, kilometres, inches, feet, yards and miles.
- Liters to Gallons Converter Convert litres to US or UK gallons, and gallons back to litres.
- Meters to Feet Converter Convert metres to feet and inches, or feet and inches back to metres.
- MPH to KMH Converter Convert miles per hour to kilometres per hour and back, with metres per second and knots.
- Ounces to ML Converter Convert US or UK fluid ounces to millilitres, and millilitres back to fluid ounces.
- Paper and Envelope Size Calculator Look up nominal A and B paper sizes, C envelope sizes, and common US sheet sizes.
- Power Converter Convert between watts, kilowatts, megawatts, horsepower and BTU per hour.
- Pressure Converter Convert between pascals, kilopascals, bar, psi, atmospheres and millimetres of mercury.
- Resistance Converter Convert between ohms, kilo-ohms and mega-ohms, and see the equivalent conductance.
- Speed Calculator Calculate speed from distance and time, and see it in metres per second, km/h, mph and knots.
- Square Feet to Square Meters Converter Convert square feet to square metres and square metres back to square feet.
- Tablespoons to Teaspoons Converter Convert between tablespoons, teaspoons, millilitres, cups and fluid ounces.
- Temperature Converter Convert Celsius, Fahrenheit, Kelvin and Rankine. Select the source and target units and the number of decimal places.
- Time Unit Converter — Seconds, Minutes, Hours & Days Convert between seconds, minutes, hours, days, weeks, months and years.
- Torque Converter Convert between newton-metres, kilogram-force metres, pound-force feet and pound-force inches.
- Voltage Converter Convert between volts, millivolts, microvolts and kilovolts.
- Volume Converter Convert between millilitres, litres, cubic metres, cups, pints, quarts, gallons and fluid ounces.
- Weight Converter Convert between milligrams, grams, kilograms, tonnes, ounces, pounds and stones.
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Choose a converter for the quantity you are measuring, not just a familiar unit name. Length, area and volume use different powers of the conversion factor. The quick previews above cover six common quantities; the full tools below include additional units and precision controls.
Start with common everyday quantities
Use length or weight for metric and customary measurements. Temperature needs a scale conversion rather than a simple unit multiplier. Volume conversions require the labeled gallon or ounce convention to match the measurement you started with.
Open a specialist tool for rates and data
Speed, fuel economy and data storage have their own conventions. Check whether a rate is a quantity per unit time or its reciprocal, and whether a storage unit uses a decimal or binary definition. A shorter displayed result may be rounded.
Keep the original unit and precision
Changing the unit changes how a quantity is expressed; it does not improve the accuracy of the original measurement. Keep extra digits for intermediate work when appropriate, then round the final result to a useful precision.