Unit converters

Convert square feet to square metres, acres to hectares and sq ft to Indian land units (guntha, cent, bigha, marla, kanal, ground), with exact factors.

Convert height from cm to feet and inches and back, and weight from kg to pounds or stones and pounds, using the exact 2.54 cm inch.

Convert miles to km, feet to metres, inches to cm and 16 other length units with exact factors. Accepts feet and inches such as 5 ft 11 in.

Convert mph to km/h, km/h to mph, m/s and knots with exact factors, plus ft/s, Mach at sea level and the speed of light.

Convert Celsius to Fahrenheit, °F to °C and both to kelvin with °F = °C × 9/5 + 32. Includes Rankine and Réaumur; rejects values below absolute zero.

Convert gallons to litres, cups to mL and fl oz to mL exactly, with US and imperial gallons, pints and fluid ounces kept separate.

Convert kg to lbs, pounds to kg, stone to kg and ounces to grams with the exact 1959 pound, plus tonnes, carats, troy ounces and tola.

Convert minutes to hours, hours to days, weeks to days and years to seconds, from nanoseconds to millennia, with the 365.2425-day Gregorian year.

Convert g-force to m/s², m/s² to g, ft/s² and gal (cm/s²), using standard gravity g₀ = 9.80665 m/s² exactly.

Convert degrees to radians and radians to degrees, plus gradians, arcminutes, arcseconds, turns and milliradians, with π carried to 50 digits.

Convert g/cm³ to kg/m³, kg/m³ to lb/ft³ and lb/gal (ppg), and g/mL to kg/L, with exact factors from the 1959 pound and foot.

Convert kWh to BTU, calories to joules, kcal to kJ and therms to kWh, using the exact definitions of the joule, calorie, BTU and electronvolt.

Convert L/min to gpm, gpm to L/min, cfm to m³/h and m³/h to L/s for pumps, plumbing and ventilation, with the exact US gallon and cubic foot.

Convert kgf to newtons, lbf to N and kN to kgf or lbf, using standard gravity (9.80665 m/s²) and the exact pound-force of 4.4482216152605 N.

Convert rpm to Hz, Hz to rpm, BPM to Hz, GHz to MHz and hertz to radians per second (ω = 2πf), from Hz to THz.

Convert hp to kW, kW to hp, watts to horsepower and BTU/h to tons of refrigeration, with mechanical (745.7 W) and metric (735.5 W) horsepower.

Convert psi to bar, bar to psi, kPa, atm, hPa, mmHg and inHg for tyre, weather and blood pressure readings, with the exact factor chain.

Convert N·m to lb-ft, lb-ft to N·m, lb-in and kgf·m for torque wrench and bolt specifications, using 1 lbf·ft = 1.3558179483314004 N·m exactly.

Convert GB to MB, TB to GB and GiB to GB with decimal (kB, MB, GB, TB) and binary (KiB, MiB, GiB, TiB) prefixes kept apart, plus bits and bytes.

Calculate how long a file takes to download or upload from its size in MB, GB or TB and your internet speed in Mbps, allowing for protocol overhead.

Convert Mbps to MB/s, Gbps to MB/s and kbps to kB/s. Network speeds are quoted in bits per second; file sizes and download meters in bytes.

Convert mpg to L/100 km, L/100 km to mpg and km/L for US and UK gallons, using L/100 km = 235.215 ÷ US mpg or 282.481 ÷ UK mpg.

Convert cups to grams, and grams to cups, for 27 baking ingredients including flour, sugar and butter, using King Arthur Baking and USDA weight charts.

Convert shoe sizes between US men's and women's, UK, EU, India, Japan and Mondopoint via foot length, using the ISO/TS 19407 formulas.

Convert clothing sizes between US, UK, EU, German, Italian and Japanese labels for women's dresses and tops, men's suits and shirt collars.

Convert px to rem, em, pt, picas, inches and mm using your root font size, parent font size and DPI. CSS fixes 1 in = 96 px = 72 pt.

Convert lakh and crore to million and billion, and write any number in words in the Indian and international systems, or turn words back into digits.

Convert between SI metric prefixes such as giga, mega, kilo, milli, micro and nano, from quecto (10⁻³⁰) to quetta (10³⁰), including the 2022 additions.

Convert acres to hectares (acres to hectares) with the exact factor, a conversion chart and worked steps.

Convert acres to square feet (acres to sq ft) with the exact factor, a conversion chart and worked steps.

Convert bar to psi (bar to psi) with the exact factor, a conversion chart and worked steps.

Convert centimeters to feet (cm to feet) with the exact factor, a conversion chart and worked steps.

Convert centimeters to inches (cm to inches) with the exact factor, a conversion chart and worked steps.

Convert centimeters to meters (cm to meters) with the exact factor, a conversion chart and worked steps.

Convert centimeters to millimeters (cm to mm) with the exact factor, a conversion chart and worked steps.

Convert degrees Celsius to degrees Fahrenheit (Celsius to Fahrenheit) with the exact formula, a conversion chart and worked steps.

Convert degrees Celsius to kelvins (Celsius to Kelvin) with the exact formula, a conversion chart and worked steps.

Convert degrees Fahrenheit to degrees Celsius (Fahrenheit to Celsius) with the exact formula, a conversion chart and worked steps.

Convert degrees Fahrenheit to kelvins (Fahrenheit to Kelvin) with the exact formula, a conversion chart and worked steps.

Convert feet to centimeters (feet to cm) with the exact factor, a conversion chart and worked steps.

Convert feet to inches (feet to inches) with the exact factor, a conversion chart and worked steps.

Convert feet to meters (feet to meters) with the exact factor, a conversion chart and worked steps.

Convert feet to miles (feet to miles) with the exact factor, a conversion chart and worked steps.

Convert gigabytes to megabytes (GB to MB) with the exact factor, a conversion chart and worked steps.

Convert gigabytes to terabytes (GB to TB) with the exact factor, a conversion chart and worked steps.

Convert grams to kilograms (grams to kg) with the exact factor, a conversion chart and worked steps.

Convert grams to ounces (grams to ounces) with the exact factor, a conversion chart and worked steps.

Convert grams to pounds (grams to pounds) with the exact factor, a conversion chart and worked steps.

Convert hectares to acres (hectares to acres) with the exact factor, a conversion chart and worked steps.

Convert horsepower to kilowatts (hp to kW) with the exact factor, a conversion chart and worked steps.

Convert inches to centimeters (inches to cm) with the exact factor, a conversion chart and worked steps.

Convert inches to feet (inches to feet) with the exact factor, a conversion chart and worked steps.

Convert inches to millimeters (inches to mm) with the exact factor, a conversion chart and worked steps.

Convert kelvins to degrees Celsius (Kelvin to Celsius) with the exact formula, a conversion chart and worked steps.

Convert kelvins to degrees Fahrenheit (Kelvin to Fahrenheit) with the exact formula, a conversion chart and worked steps.

Convert kilocalories to kilojoules (kcal to kJ) with the exact factor, a conversion chart and worked steps.

Convert kilograms to grams (kg to grams) with the exact factor, a conversion chart and worked steps.

Convert kilograms to pounds (kg to lbs) with the exact factor, a conversion chart and worked steps.

Convert kilograms to stone (kg to stone) with the exact factor, a conversion chart and worked steps.

Convert kilojoules to kilocalories (kJ to kcal) with the exact factor, a conversion chart and worked steps.

Convert kilometers per hour to meters per second (km/h to m/s) with the exact factor, a conversion chart and worked steps.

Convert kilometers per hour to miles per hour (km/h to mph) with the exact factor, a conversion chart and worked steps.

Convert kilometers to miles (km to miles) with the exact factor, a conversion chart and worked steps.

Convert kilopascals to psi (kPa to psi) with the exact factor, a conversion chart and worked steps.

Convert kilowatts to horsepower (kW to hp) with the exact factor, a conversion chart and worked steps.

Convert knots to miles per hour (knots to mph) with the exact factor, a conversion chart and worked steps.

Convert liters per 100 km to US miles per gallon (L/100km to mpg) with the exact formula, a conversion chart and worked steps.

Convert liters to milliliters (liters to ml) with the exact factor, a conversion chart and worked steps.

Convert liters to US cups (liters to cups) with the exact factor, a conversion chart and worked steps.

Convert liters to US gallons (liters to gallons) with the exact factor, a conversion chart and worked steps.

Convert megabits per second to megabytes per second (Mbps to MB/s) with the exact factor, a conversion chart and worked steps.

Convert megabytes to gigabytes (MB to GB) with the exact factor, a conversion chart and worked steps.

Convert meters per second to kilometers per hour (m/s to km/h) with the exact factor, a conversion chart and worked steps.

Convert meters to centimeters (meters to cm) with the exact factor, a conversion chart and worked steps.

Convert meters to feet (meters to feet) with the exact factor, a conversion chart and worked steps.

Convert meters to inches (meters to inches) with the exact factor, a conversion chart and worked steps.

Convert meters to yards (meters to yards) with the exact factor, a conversion chart and worked steps.

Convert metric tonnes to pounds (metric tons to lbs) with the exact factor, a conversion chart and worked steps.

Convert miles per hour to kilometers per hour (mph to km/h) with the exact factor, a conversion chart and worked steps.

Convert miles to feet (miles to feet) with the exact factor, a conversion chart and worked steps.

Convert miles to kilometers (miles to km) with the exact factor, a conversion chart and worked steps.

Convert milliliters to liters (ml to liters) with the exact factor, a conversion chart and worked steps.

Convert milliliters to US cups (ml to cups) with the exact factor, a conversion chart and worked steps.

Convert milliliters to US fluid ounces (ml to oz) with the exact factor, a conversion chart and worked steps.

Convert millimeters to centimeters (mm to cm) with the exact factor, a conversion chart and worked steps.

Convert millimeters to inches (mm to inches) with the exact factor, a conversion chart and worked steps.

Convert newton-meters to pound-feet (Nm to ft-lbs) with the exact factor, a conversion chart and worked steps.

Convert ounces to grams (ounces to grams) with the exact factor, a conversion chart and worked steps.

Convert ounces to pounds (oz to lbs) with the exact factor, a conversion chart and worked steps.

Convert pound-feet to newton-meters (ft-lbs to Nm) with the exact factor, a conversion chart and worked steps.

Convert pounds to kilograms (lbs to kg) with the exact factor, a conversion chart and worked steps.

Convert pounds to ounces (lbs to oz) with the exact factor, a conversion chart and worked steps.

Convert pounds to stone (lbs to stone) with the exact factor, a conversion chart and worked steps.

Convert psi to bar (psi to bar) with the exact factor, a conversion chart and worked steps.

Convert psi to kilopascals (psi to kPa) with the exact factor, a conversion chart and worked steps.

Convert square feet to acres (sq ft to acres) with the exact factor, a conversion chart and worked steps.

Convert square feet to square meters (sq ft to sq m) with the exact factor, a conversion chart and worked steps.

Convert square meters to square feet (sq m to sq ft) with the exact factor, a conversion chart and worked steps.

Convert stone to kilograms (stone to kg) with the exact factor, a conversion chart and worked steps.

Convert stone to pounds (stone to lbs) with the exact factor, a conversion chart and worked steps.

Convert terabytes to gigabytes (TB to GB) with the exact factor, a conversion chart and worked steps.

Convert US cups to milliliters (cups to ml) with the exact factor, a conversion chart and worked steps.

Convert US cups to US fluid ounces (cups to oz) with the exact factor, a conversion chart and worked steps.

Convert US cups to US tablespoons (cups to tbsp) with the exact factor, a conversion chart and worked steps.

Convert US fluid ounces to milliliters (oz to ml) with the exact factor, a conversion chart and worked steps.

Convert US fluid ounces to US cups (oz to cups) with the exact factor, a conversion chart and worked steps.

Convert US gallons to liters (gallons to liters) with the exact factor, a conversion chart and worked steps.

Convert US miles per gallon to liters per 100 km (mpg to L/100km) with the exact formula, a conversion chart and worked steps.

Convert US pints to US cups (pints to cups) with the exact factor, a conversion chart and worked steps.

Convert US quarts to liters (quarts to liters) with the exact factor, a conversion chart and worked steps.

Convert US short tons to pounds (tons to lbs) with the exact factor, a conversion chart and worked steps.

Convert US tablespoons to milliliters (tablespoons to ml) with the exact factor, a conversion chart and worked steps.

Convert US tablespoons to US cups (tbsp to cups) with the exact factor, a conversion chart and worked steps.

Convert US tablespoons to US teaspoons (tbsp to tsp) with the exact factor, a conversion chart and worked steps.

Convert US teaspoons to milliliters (teaspoons to ml) with the exact factor, a conversion chart and worked steps.

Convert US teaspoons to US tablespoons (tsp to tbsp) with the exact factor, a conversion chart and worked steps.

Convert yards to meters (yards to meters) with the exact factor, a conversion chart and worked steps.