⇄ Unit Converters
Convert between metric and imperial units using the exact definitions published by NIST and the International Bureau of Weights and Measures. The inch is exactly 2.54 cm and the pound exactly 0.45359237 kg, so results are as precise as the units themselves. Every converter shows the most useful related units at a glance.
18 free unit converters
Angle ConverterConvert degrees, radians, gradians (gons), turns, arcminutes and arcseconds, plus degrees-minutes-seconds (DMS).Area ConverterConvert square feet, square meters, acres, hectares, square yards, square miles and more. Exact factors from NIST.Cooking Measurement ConverterConvert cups, tablespoons, teaspoons, fluid ounces and mL, and estimate grams for flour, sugar, butter and more.Data Storage ConverterConvert bytes, KB, MB, GB, TB and binary KiB, MiB, GiB (plus TiB and bits). See why a 1 TB drive shows as about 931 GiB.Density ConverterConvert density between kg/m³, g/cm³, lb/ft³, lb/gal, tonnes/m³ and tons/yd³, with specific gravity.Energy ConverterConvert joules, kilojoules, calories, kilocalories (food Calories), kWh, Wh, BTU, foot-pounds and electronvolts.Force ConverterConvert force between newtons, kilonewtons, pound-force, kips, kilogram-force, dynes and poundals using exact NIST factors.Fraction to Decimal ConverterConvert fractions and mixed numbers to decimals and percentages, or decimals to simplified fractions and nearest 1/16 or 1/64.Fuel Economy ConverterConvert fuel economy between mpg (US), mpg (UK), L/100 km and km/L. Handles the inverse L/100 km scale correctly.Height Converter (Feet and Inches to cm)Convert height in feet and inches to centimeters and meters, or centimeters back to feet and inches (e.g. 5 ft 10 in).Length ConverterConvert between millimeters, centimeters, meters, kilometers, inches, feet, yards, miles and nautical miles instantly, using exact factors.Power ConverterConvert watts, kilowatts, horsepower (mechanical and metric), BTU per hour and tons of refrigeration.Pressure ConverterConvert psi, bar, kPa, pascals, atmospheres, mmHg, torr and inches of mercury (inHg) using NIST factors.Speed ConverterConvert mph, km/h, meters per second, feet per second and knots. Exact factors based on the international mile and foot.Temperature ConverterConvert Celsius to Fahrenheit, Fahrenheit to Celsius and either to Kelvin (plus Rankine) instantly, with the exact formulas explained.Time ConverterConvert between milliseconds, seconds, minutes, hours, days, weeks and years, with a days-hours-minutes breakdown.Volume ConverterConvert liters, gallons (US and UK), cubic feet, cubic meters, cubic yards, quarts, cups and milliliters instantly.Weight ConverterConvert kilograms, pounds, ounces, grams, stone and tons (mass). Also shows pounds + ounces and stones + pounds.