Unit Converters

Unit converters for length, weight, volume, temperature, speed, pressure, energy, data and more. Each converter uses the exact defined factor between the units and works in both directions.

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Compass Bearing Calculator Calculate the initial compass bearing and great-circle distance between two latitude/longitude points.
mmHg to kPa Converter Converts pressure between millimeters of mercury (torr) and kilopascals, and shows the equivalent in atmospheres.
Energy Converter Convert energy between joules, kilojoules, kilocalories and kWh.
Parsec to Light-Year Converter Converts a distance in parsecs into light-years, astronomical units, and kilometers using exact astronomical constants.
Power Converter Convert power between watts, kilowatts and horsepower.
Temperature Converter Instantly convert a temperature value between Celsius, Fahrenheit and Kelvin.
Area Converter Convert an area between square meters, square kilometers, hectares, acres, square feet and square yards.
Volume Converter Convert a volume between liters, milliliters, cubic meters, gallons, quarts, pints, cups and fluid ounces.
Pressure Converter Convert pressure between pascal, bar, psi and atmospheres.
Weight Converter Convert a weight between kilograms, grams, milligrams, tonnes, pounds, ounces and stone.
Data Storage Converter Convert a data size between bits, bytes, kilobytes, megabytes, gigabytes and terabytes (1 KB = 1024 bytes).
Light-Year Distance Calculator Convert a distance in light-years to kilometres, astronomical units and parsecs.
Length Converter Convert a length between meters, kilometers, centimeters, millimeters, miles, yards, feet and inches.
Speed Converter Convert a speed between kilometers per hour, miles per hour, meters per second, knots and feet per second.
Franklin to Coulomb Converter Converts electric charge between franklins (statcoulombs) and coulombs, where 1 Fr = 3.335640951982×10⁻¹⁰ C.
Technical Atmosphere to Bar Converter Convert technical atmospheres (at, kgf/cm²) to bar and psi (1 at = 0.9807 bar). Common on older pressure gauges.
Rai to Square Meter Converter Convert land area from the Thai rai to square metres (1 rai = 1,600 m²) and hectares. Essential for property and farming in Thailand.
AU to Kilometers Converter Converts between astronomical units (AU) and kilometers, in either direction (1 AU = 149,597,870.7 km).
Stones and Pounds to Kg Converter Convert a weight in stones and pounds to kilograms. The stone (14 lb) is still used for body weight in the UK and Ireland.
Acres to Hectares Converter Convert land area from acres to hectares and square metres (1 acre = 0.4047 ha).
Knots to MPH Converter Convert a speed in knots to miles per hour and kilometres per hour. Handy for sailing, aviation and weather where speeds are quoted in knots.
Erg to Joule Converter Convert energy from ergs (the CGS unit) to joules and calories. 1 erg equals 10⁻⁷ joules — handy for physics problems quoted in CGS units.
Bigha to Acre Converter Convert land area from bigha to acres and square metres using a common value (1 bigha = 0.625 acre). Note that bigha varies by region.
Phot to Lux Converter Convert phot to lux, foot-candles instantly with this fast, accurate unit converter.
Typographic points to Millimetres Converter Convert typographic points to millimetres, inches instantly with this fast, accurate unit converter.
Bar to Atm Converter Convert pressure from bar to standard atmospheres, psi and kilopascals. A handy multi-unit pressure converter for science and engineering.
Electronvolts (eV) to Joules Converter Convert electronvolts (ev) to joules, kj per mole instantly with this fast, accurate unit converter.
Leagues to Kilometers Converter Convert leagues to kilometres and miles (1 league ≈ 4.828 km). A historical distance unit still seen in literature.
Kilogram-Force to Newtons Converter Convert force from kilogram-force to newtons and pounds-force (1 kgf = 9.807 N).
Tola to Grams Converter Convert tola to grams, ounces instantly with this fast, accurate unit converter.
Cubic Feet to Liters Converter Converts volume between cubic feet and liters in either direction.
Pound-Feet to Newton-Meters Converter Convert torque from pound-feet to newton-metres and kilogram-force metres (1 lb·ft = 1.356 N·m).
BTU to Kilowatt-hours Converter Convert btu to kilowatt-hours, joules instantly with this fast, accurate unit converter.
Hectares to Square Kilometers Converter Convert an area between hectares and square kilometers in either direction, with the conversion rate and reverse equivalent.
Slugs to Kilograms Converter Convert slugs to kilograms, pounds instantly with this fast, accurate unit converter.
In-Pounds to Newton-Meters Converter Converts torque between inch-pounds and newton-meters in either direction.
Rad to Gray Converter Converts absorbed radiation dose between rad and gray (Gy), where 1 Gy equals 100 rad.
Atomic mass units (u) to Grams Converter Convert atomic mass units (u) to grams, kilograms instantly with this fast, accurate unit converter.
Lumens to Lux Calculator Convert luminous flux in lumens to illuminance in lux by dividing by the lit area: lux = lumens ÷ m².
UTM to Lat-Long Converter Converts UTM easting, northing and zone (WGS84) into geographic latitude and longitude in decimal degrees.
Gibibyte to Gigabyte Converter Convert binary gibibytes (GiB, base-2) to decimal gigabytes (GB, base-10) and bytes. Clears up the common confusion between the two units.
Kilowatt-hours to Joules Converter Convert kilowatt-hours to joules, megajoules instantly with this fast, accurate unit converter.
Shot of Chain to Fathom Converter Converts shots of anchor chain to fathoms, feet and meters (1 shot = 15 fathoms = 90 feet = 27.432 m).
Beaufort to m/s Converter Convert a Beaufort wind force number to wind speed in meters per second and km/h, with a force description.
Decimal Degrees to UTM Converter Converts WGS84 latitude and longitude in decimal degrees to UTM zone, easting and northing.
Light-years to Parsecs Converter Convert light-years to parsecs, kilometres instantly with this fast, accurate unit converter.
m/s to km/h Converter Convert speed between metres per second and kilometres per hour using the 3.6 factor, in either direction.
Arcminute to Degree Converter Converts between arcminutes and degrees in both directions, where 1 degree equals 60 arcminutes.
Cent to Square Meter Converter Convert the cent land unit to square metres and square feet (1 cent = 40.47 m²). Common in South Indian property.
Nox to Lux Converter Converts illuminance between nox and lux in either direction, where 1 nox equals 0.001 lux.
Watt-Hours Calculator Calculate the energy of a battery in watt-hours and kilowatt-hours from its amp-hours and voltage.
Hectares to Acres Converter Convert hectares to acres, square metres instantly with this fast, accurate unit converter.
ECEF to Geodetic Converter Converts WGS84 Earth-Centered Earth-Fixed (ECEF) X, Y, Z coordinates in meters to geodetic latitude, longitude, and altitude using Bowring's method.
Mach to km/h Converter Convert between Mach number and km/h at sea level, where Mach 1 equals 1225.044 km/h.
Fathom to Meter Converter Convert depth from fathoms to metres and feet (1 fathom = 1.8288 m). Useful for nautical charts, diving and maritime work.
Furlong to Meter Converter Converts length between furlongs and meters in either direction (1 furlong = 201.168 m).
Drops to mL Converter Convert a number of drops to millilitres and teaspoons using a drop factor (default 20 drops per mL). Useful for medication dosing and IV drip estimates.
Ell to Meter Converter Convert between English ells and meters, where one English ell equals 1.143 meters, in either direction.
Light-Year to AU Converter Converts distances between light-years and astronomical units (1 light-year = 63,241.077 AU) in either direction.
Bearing to Compass Point Converter Convert a bearing in degrees to a 16-point compass direction. Bearing to Compass Point Converter gives you the result instantly from a simple input.