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Convert between metric and US customary length units, including the composite feet-and-inches and fractional-inch forms that shop…
Area and capacity conversions across metric, US customary and imperial systems, including the land measures and the…
Mass conversions across metric, avoirdupois, troy and stone systems, plus the density and specific-gravity scales used in labs…
Temperature scale conversions including absolute scales, plus the pressure and vacuum units used in HVAC, process and…
Convert the energy, power, force and torque units that appear on utility bills, equipment nameplates and torque specs, including…
Speed, volumetric and mass flow, and viscosity conversions for drivers, pilots, pump and HVAC specifiers, and lubrication and…
Convert the coded trade sizes used in shops and on job sites into real dimensions: tire codes, pipe NPS, sheet gauge, drill sizes…
Everyday conversions for the kitchen, the car and the shopping aisle, where the same nominal unit differs by country, ingredient…
Angle and slope conversions used in surveying and construction, digital storage and bandwidth units, and numeral-notation…
Most used in unit & measurement conversion
- Millimeters to Inches CalculatorInternational inch, 1959 (1 in = 25.4 mm exactly)Convert millimeters, centimeters or meters into decimal inches and the nearest usable fraction, or run an inch dimension back…
- Decimal Inches to Fraction CalculatorInternational inch, 1959 (1 in = 25.4 mm exactly)This converter turns a decimal inch measurement into the nearest fraction you can actually find on a rule — halves through…
- Feet and Inches to Centimeters Height CalculatorInternational inch, 1959 (1 in = 25.4 mm exactly)Enter a height in feet and inches and this converter returns it in centimeters, meters and total inches; switch the direction…
- Meters to Feet CalculatorInternational foot, 1959 (1 ft = 0.3048 m exactly)Convert meters to feet, to feet-plus-inches and to yards, or run the conversion backwards from feet to meters. The…
- Miles to Kilometers CalculatorInternational mile, 1959 (1 mi = 1609.344 m exactly)Convert a distance between miles, kilometers, meters, yards and nautical miles. The statute mile is exactly 1609.344 meters —…
- Square Feet to Square Meters CalculatorInternational Yard and Pound Agreement (1959)Floor areas cross borders constantly — a listing in square feet, a specification in square meters, a flooring quote in…
- Acres to Hectares CalculatorInternational Yard and Pound Agreement (1959)Convert a parcel between acres, hectares, square feet, square meters and square miles using the exact factors that follow from…
- Cubic Yards to Cubic Feet CalculatorInternational Yard and Pound Agreement (1959)Bulk materials are ordered in cubic yards in North America, in cubic meters almost everywhere else, and measured on site in…
- Gallons to Liters CalculatorUS liquid gallon (231 in3) and UK Weights and Measures Act 1985 (4.54609 L)The US gallon and the imperial gallon are different volumes by 20%, and almost every gallon-to-litre error comes from not…
- Fluid Ounces to Milliliters CalculatorUS liquid gallon (231 in3) and UK Weights and Measures Act 1985 (4.54609 L gallon)There are three different fluid ounces in daily use and they are not interchangeable. The US fluid ounce is 29.5735295625 mL…
- Kilograms to Pounds CalculatorInternational Yard and Pound Agreement (1959): 1 lb = 0.45359237 kg exactlyOne pound is exactly 0.45359237 kilograms. That single definition, agreed internationally in 1959, is all this calculator…
- Ounces to Grams CalculatorInternational Yard and Pound Agreement (1959): 1 oz av = 28.349523125 g exactlyOne avoirdupois ounce is exactly 28.349523125 grams. It is exact because the ounce is one sixteenth of the international pound…