Unit Conversion Calculators

Free unit converters for length, weight, temperature, volume, pressure, time and more — fast, accurate conversions between metric and imperial units.

Angle

Degrees to Radians CalculatorConvert degrees to radians instantly.Radians to Degrees CalculatorConvert radians to degrees instantly.

Area & Land

Square Feet to Acres CalculatorConvert square feet to acres instantly.Acres to Hectares CalculatorConvert acres to hectares instantly.Square Meters to Square Feet CalculatorConvert square meters to square feet instantly.Square Meters to Square Yards CalculatorConvert square meters to square yards instantly.Hectares to Square Kilometers CalculatorConvert hectares to square kilometers instantly.Square Feet to Square Meters CalculatorConvert square feet to square meters instantly.Yards to Acres CalculatorConvert square yards to acres instantly.Acreage CalculatorCalculate acres from a rectangular plot’s length and width in feet.Land Area CalculatorEnter a land area once and see it in square feet, acres, hectares and square meters at the same time.Acres to Square Miles CalculatorConvert acres to square miles instantly.

Data & Storage

Byte Conversion CalculatorConvert between bytes, KB, MB, GB, TB and PB.

Metric ↔ Imperial

CM to Inches CalculatorConvert centimeters to inches instantly.KG to LBS CalculatorConvert kilograms to pounds instantly.Celsius to Fahrenheit CalculatorConvert Celsius temperatures to Fahrenheit.Feet to Meters CalculatorConvert feet to meters instantly.KM to Miles CalculatorConvert kilometers to miles instantly.MM to Inches CalculatorConvert millimeters to inches instantly.Ounces to Grams CalculatorConvert ounces to grams instantly.Kelvin ConverterConvert Kelvin to Celsius and Fahrenheit.Pounds to Kilograms CalculatorConvert pounds to kilograms instantly.Stone to KG CalculatorConvert stone to kilograms instantly.Grams to Ounces CalculatorConvert grams to ounces instantly.Yards to Meters CalculatorConvert yards to meters instantly.Inches to Feet CalculatorConvert inches to feet instantly.Miles to Feet CalculatorConvert miles to feet instantly.Metric Tons to Kilograms CalculatorConvert metric tons to kilograms instantly.Fahrenheit to Kelvin CalculatorConvert Fahrenheit temperatures to Kelvin.CM to Meters CalculatorConvert centimeters to meters instantly.CM to MM CalculatorConvert centimeters to millimeters instantly.CM to KM CalculatorConvert centimeters to kilometers instantly.Ounces to KG CalculatorConvert ounces to kilograms instantly.Meters to Kilometers CalculatorConvert meters to kilometers instantly.Inches to CM CalculatorConvert inches to centimeters instantly.Fahrenheit to Celsius CalculatorConvert Fahrenheit temperatures to Celsius instantly.Pounds to Stone CalculatorConvert pounds to stone (and remaining pounds) instantly.

Multi-Unit Converters

Length ConverterConvert between mm, cm, m, km, inches, feet, yards and miles.Weight ConverterConvert between mg, g, kg, oz, lb, stone and metric tons.Temperature ConverterConvert between Celsius, Fahrenheit and Kelvin.Speed ConverterConvert between mph, km/h, m/s, knots and ft/s.Area ConverterConvert between square feet, square yards, square meters, square kilometers, acres and hectares.Volume ConverterConvert between milliliters, liters, US gallons, cubic feet and cubic meters.Energy ConverterConvert between joules, kilojoules, calories, kilowatt-hours and BTU.Power ConverterConvert between watts, kilowatts, horsepower and BTU per hour.Density ConverterConvert between kg/m³, g/cm³ and lb/ft³.Force ConverterConvert between Newtons, pounds-force, kilogram-force and dynes.Angle ConverterConvert between degrees, radians, gradians, arcminutes, arcseconds and turns.

Navigation

Nautical Miles to Kilometers CalculatorConvert nautical miles to kilometers instantly.Coordinates Converter (DMS to Decimal Degrees)Convert degrees, minutes, seconds to decimal degrees.Scale Calculator (Map Scale to Real Distance)Convert a map distance and scale ratio to real distance.Decimal Degrees to DMS CalculatorConvert decimal degrees to degrees, minutes and seconds.

Numeral Systems

Binary to Decimal / Decimal to Binary ConverterConvert between binary and decimal number systems.Decimal to Hexadecimal CalculatorConvert decimal numbers to hexadecimal instantly.Binary to Octal CalculatorConvert binary numbers to octal instantly.Roman Numeral ConverterConvert between numbers and Roman numerals.Number Scale Converter (Thousand/Million/Billion/Trillion)Convert between thousand, million, billion and trillion.Octal to Decimal CalculatorConvert octal numbers to decimal instantly.Octal to Binary CalculatorConvert octal numbers to binary instantly.Hexadecimal to Decimal CalculatorConvert hexadecimal numbers to decimal instantly.Hexadecimal to Binary CalculatorConvert hexadecimal numbers to binary instantly.Crore to Million CalculatorConvert Indian crores to millions instantly.Lakh to Million CalculatorConvert Indian lakhs to millions instantly.Lakh to Crore CalculatorConvert Indian lakhs to crores instantly.Million to Thousand CalculatorConvert millions to thousands instantly.Binary to Hexadecimal CalculatorConvert binary numbers to hexadecimal instantly.Decimal to Octal CalculatorConvert decimal numbers to octal instantly.

Other Conversions

MPG to L/100km (Fuel Economy) ConverterConvert miles per gallon to liters per 100 km.Knots to MPH CalculatorConvert knots to miles per hour instantly.PPM Calculator (Parts Per Million)Calculate concentration in parts per million.Dimensional Analysis CalculatorChain two conversion factors together step by step.Quantity Converter (Unit, Dozen, Score, Gross, Ream)Convert between individual units, dozens, scores, gross and reams.Torque to Horsepower CalculatorConvert engine torque and RPM to horsepower.Newton Meter Calculator (N·m to Foot-Pounds)Convert newton-meters of torque to foot-pounds.m/s to km/h CalculatorConvert meters per second to kilometers per hour.Knots to km/h CalculatorConvert knots to kilometers per hour instantly.

Pressure

PSI to Bar/ATM ConverterConvert PSI to bar and atmospheres instantly.kPa to PSI CalculatorConvert kilopascals to PSI instantly.Bar to PSI CalculatorConvert bar to PSI instantly.Torr to ATM CalculatorConvert torr to atmospheres instantly.Pressure ConverterConvert between PSI, bar, pascals, kilopascals, atmospheres and torr.ATM to PSI CalculatorConvert atmospheres to PSI instantly.MPa to PSI CalculatorConvert megapascals to PSI instantly.Pa to PSI CalculatorConvert pascals to PSI instantly.mmHg to ATM CalculatorConvert millimeters of mercury to atmospheres.

Tech & Data

HEX to RGB Color ConverterConvert a hex color code to RGB values instantly.Unix Timestamp ConverterConvert Unix timestamps to dates and back.KB to MB CalculatorConvert kilobytes to megabytes instantly.MB to GB CalculatorConvert megabytes to gigabytes instantly.RGB to HEX Color ConverterConvert RGB color values to a hex code instantly.Mbps Calculator (Download Time)Estimate download time from file size and Mbps speed.

Time

Time ConverterConvert between seconds, minutes, hours, days, weeks and years.Minutes to Seconds CalculatorConvert minutes to seconds instantly.Days to Weeks CalculatorConvert days to weeks instantly.Months to Years CalculatorConvert months to years instantly.Seconds to Hours CalculatorConvert seconds to hours instantly.Days to Years CalculatorConvert days to years instantly.Time Zone ConverterConvert a time between two fixed UTC offsets.Hours to Days CalculatorConvert hours to days instantly.Hours to Minutes CalculatorConvert hours to minutes instantly.Weeks to Months CalculatorConvert weeks to months using the average calendar month.

Volume & Cooking

Gallon Calculator (Liters to Gallons)Convert liters to US gallons instantly.Cups to mL CalculatorConvert US cups to milliliters instantly.Tablespoons to mL CalculatorConvert US tablespoons to milliliters instantly.mL to Oz CalculatorConvert milliliters to US fluid ounces instantly.Liters to Quarts CalculatorConvert liters to US quarts instantly.Quarts to Gallons CalculatorConvert US quarts to gallons instantly.Teaspoons to mL CalculatorConvert US teaspoons to milliliters instantly.Fluid Ounces to Liters CalculatorConvert US fluid ounces to liters instantly.Cups to Gallons CalculatorConvert US cups to gallons instantly.Pints to Gallons CalculatorConvert US pints to gallons instantly.Cubic Feet to Gallons CalculatorConvert cubic feet to US gallons instantly.Metric Tablespoon to mL CalculatorConvert metric tablespoons to milliliters instantly.Oz to mL CalculatorConvert US fluid ounces to milliliters instantly.Cups to Oz CalculatorConvert US cups to fluid ounces instantly.Gallons to Pounds CalculatorConvert gallons of water to pounds instantly.mg to mL CalculatorConvert milligrams to milliliters using a substance’s density.