Unit Converter & Calculator
Convert over 280 units instantly
Use this unit converter to convert between different measurement systems in seconds, without searching for formulas or using a separate calculator. It is designed for quick, accurate conversions across a wide range of unit groups.
*Note: Results are limited to a maximum of 30 decimal places.
How to use the unit converter
1. Choose a unit group
Select a category at the top, such as length, mass, temperature, or another group.
2. Set your units
Choose the unit you are converting from and the unit you want to convert to.
3. Enter a value
Type a number and the unit converter will automatically show the converted result.
Metric and imperial
Convert in both directions between metric and imperial units, such as kilometres to miles or kilograms to pounds.
Cooking conversions
Convert kitchen measurements like cups, tablespoons, and fluid ounces for faster and more accurate recipes.
Science and engineering
Convert technical units for pressure, power, energy, torque, and density with high precision.
Supported unit groups and examples
This unit converter can be used for a wide range of measurements, including:
Mass flow
- Kilogram per second (kg/s)
- Pound per second (lb/s)
- Pound per minute (lb/min)
Force per distance
- Newton per metre (N/m)
- Pound-force per foot (lbf/ft)
- Pound-force per inch (lbf/in)
Volume flow
- Cubic metre per second (m³/s)
- Cubic foot per second (ft³/s)
- Cubic foot per minute (ft³/min)
- Cubic inch per minute (in³/min)
- US gallon per minute (gpm_US)
Force
- Newton (N)
- Dyne (dyn)
- Kilogram-force (kgf)
- Kilopond (kpf)
- Kip (kip)
- Ounce-force (ozf)
- Pound-force (lbf)
- Poundal (pdl)
Electric charge
- Abcoulomb (abC)
- Ampere-hour (A·h)
- Coulomb (C)
- Faraday (F)
- Statcoulomb (statC)
- Millifarad (mF)
- Microfarad (μF)
- Picofarad (pF)
Viscosity
- Pascal-second (Pa·s)
- Centipoise (cP)
- Centistoke (cSt)
- Poise (P)
- Stoke (St)
- Pound-second per square foot (lb·s/ft²)
- Pound-mass second per foot (lbm·s/ft)
- Slug-second per foot (slug·s/ft)
Speed
- Metre per second (m/s)
- Kilometre per hour (km/h)
- Kilometre per second (km/s)
- Foot per second (ft/s)
- Foot per minute (ft/min)
- Miles per hour (mph)
- Knot (kn)
- Mach (STP) (Ma)
- Speed of light (c)
Light
- Lumen per square metre (lm/m²)
- Lumen per square centimetre (lm/cm²)
- Lumen per square foot (lm/ft²)
- Foot-candle (fc)
- Foot-lambert (fl)
- Candela per square metre (cd/m²)
- Candela per square centimetre (cd/cm²)
- Lux (lx)
- Phot (ph)
Density
- Kilogram per cubic metre (kg/m³)
- Gram per cubic centimetre (g/cm³)
- Grain per US gallon (gr/gal_US)
- Grain per gallon (gr/gal)
- Pound per cubic foot (lb/ft³)
- Pound per cubic inch (lb/in³)
- Ounce per UK gallon (oz/gal_UK)
- Ounce per US gallon (oz/gal_US)
- Slug per cubic foot (slug/ft³)
- Long ton per cubic yard (ton_l/yd³)
Torque
- Foot-pound force (ftlb)
- Foot-poundal (ftpdl)
- Foot-ounce force (ftoz)
- Dyne-metre (dynm)
- Joule per radian (J/rad)
- Poundal-metre (pdlm)
- Kilogram-force metre (kgf·m)
- Kilogram-force centimetre (kgfcm)
- Kilonewton-metre (kNm)
- Kilopond-metre (kpm)
- Pound-force foot (lbf·ft)
- Pound-force inch (lbf·in)
- Meganewton-metre (MNm)
- Metre-kilogram (mkg)
- Micronewton-metre (μNm)
- Millinewton-metre (mNm)
- Nanonewton-metre (nNm)
- Newton-centimetre (N·cm)
- Newton-metre (N·m)
- Newton-millimetre (N·mm)
- Inch-pound force (inlb)
- Inch-ounce force (inoz)
- Piconewton-metre (pNm)
- Ounce-foot (ozft)
- Ounce-inch (ozin)
Temperature
- Celsius (°C)
- Kelvin (K)
- Fahrenheit (°F)
- Rankine (°R)
- Newton scale (°N)
- Delisle (°De)
- Hectokelvin (hK)
- Kilokelvin (kK)
- Megakelvin (MK)
- Millikelvin (mK)
- Planck temperature (T_P)
- Rankine (°Ra)
- Réaumur (°Ré)
- Rømer (°Rø)
Power
- Watt (W)
- Kilowatt (kW)
- Megawatt (MW)
- Milliwatt (mW)
- BTU per hour (BTU/h)
- BTU per second (BTU/s)
- BTU per minute (BTU/min)
- Thermal BTU per hour (BTU_th/h)
- Calorie per second (cal/s)
- Calorie per minute (cal/min)
- Erg per second (erg/s)
- Foot-pound per hour (ft·lbf/h)
- Foot-pound per minute (ft·lbf/min)
- Foot-pound per second (ft·lbf/s)
- Horsepower (hp)
- Electric horsepower (hp_e)
- Boiler horsepower (hp_b)
- Metric horsepower (hp_m)
- British horsepower (hp_UK)
- Kilocalorie per minute (kcal/min)
- Kilocalorie per second (kcal/s)
Time
- Atomic unit of time (au_t)
- Attosecond (as)
- Day (d)
- Femtosecond (fs)
- Tropical year (yr_t)
- Sidereal year (yr_s)
- Month (mo)
- Microsecond (µs)
- Millisecond (ms)
- Minute (min)
- Nanosecond (ns)
- Picosecond (ps)
- Planck time (t_P)
- Shake (shake)
- Sidereal month (mo_sid)
- Sidereal year (yr_s)
- Svedberg (S)
- Second (s)
- Hour (h)
Acceleration
- Metre per second squared (m/s²)
- Foot per second squared (ft/s²)
- Standard gravity (g)
- Gal (gal)
- Inch per second squared (in/s²)
- Micrometre per second squared (μm/s²)
- Centimetre per second squared (cm/s²)
- Millimetre per second squared (mm/s²)
- Kilometre per second squared (km/s²)
- Foot per hour per second (fph/s)
- Foot per minute per second (fpm/s)
- Foot per second squared (fps²)
- Inch per minute per second (ipm/s)
- Inch per second squared (ips²)
- Knot per second (kn/s)
- Mile per hour per second (mph/s)
- Mile per minute per second (mpm/s)
- Mile per second squared (mps²)
- Milligal (mGal)
- Planck acceleration (aₚ)
Pressure
- Pascal (Pa)
- Standard atmosphere (atm)
- Technical atmosphere (at)
- Bar (bar)
- Centimetre of mercury (cmHg)
- Centimetre of water (cmH₂O)
- Decibar (dbar)
- Kilogram-force per square centimetre (kgf/cm²)
- Kilogram-force per square metre (kgf/m²)
- Kip per square inch (kip/in²)
- Millibar (mbar)
- Millimetre of mercury (mmHg)
- Kilopascal (kPa)
- Megapascal (MPa)
- Poundal per square foot (pdl/ft²)
- Pound-force per square foot (lbf/ft²)
- Pound-force per square inch (psi)
- Torr (Torr)
Mass and weight
- Kilogram (kg)
- Decagram (dag)
- Gram (g)
- Milligram (mg)
- Microgram (µg)
- Carat (ct)
- Slug (slug)
- Ounce (mass) (oz)
- Troy ounce (oz_t)
- Pound (lb)
- Troy pound (lb_t)
- Long hundredweight (cwt_l)
- Short hundredweight (cwt_s)
- Assay ton (ton_a)
- Long ton (ton_l)
- Short ton (ton_s)
- Metric ton (t)
- Tonne (tonne)
- Stone (st)
Energy
- British thermal unit (BTU)
- British thermal unit (thermal) (BTU_th)
- Calorie (SI) (cal)
- Calorie (mean) (cal_m)
- Calorie (thermal) (cal_th)
- Electronvolt (eV)
- Erg (erg)
- Joule (J)
- Foot-pound force (ft·lbf)
- Foot-poundal (ft·pdl)
- Horsepower-hour (hp·h)
- Kilocalorie (kcal)
- Kilowatt-hour (kW·h)
- Ton of TNT (tTNT)
- Volt-coulomb (V·C)
- Watt-hour (W·h)
- Watt-second (W·s)
Volume
- Cubic metre (m³)
- Cubic decimetre (dm³)
- Cubic centimetre (cm³)
- Cubic millimetre (mm³)
- Litre (L)
- Millilitre (mL)
- Cubic inch (in³)
- Cubic foot (ft³)
- Cubic yard (yd³)
- Acre-foot (acre·ft)
- Barrel (oil) (bbl)
- Board foot (bd ft)
- US bushel (bu_US)
- Cup (cup)
- US fluid ounce (fl oz_US)
- UK fluid ounce (fl oz_UK)
- US gill (gi_US)
- US gallon (gal_US)
- UK gallon (gal_UK)
- US peck (pk_US)
- US pint (pt_US)
- Tablespoon (tbsp)
- Teaspoon (tsp)
Area
- Hectare (ha)
- Acre (acre)
- Are (a)
- Barn (barn)
- Rood (rood)
- Square centimetre (cm²)
- Square decimetre (dm²)
- Square metre (m²)
- Square kilometre (km²)
- Circular mil (cmil)
- Square foot (ft²)
- Square inch (in²)
- Square mile (mi²)
- Square yard (yd²)
Length
- Metre (m)
- Angstrom (Å)
- Astronomical unit (AU)
- Calibre (cal)
- Centimetre (cm)
- Decimetre (dm)
- Kilometre (km)
- Ell (ell)
- Em (em)
- Fathom (ftm)
- Furlong (fur)
- Fermi (fm)
- Foot (ft)
- Inch (in)
- League (international) (lea)
- League (UK) (lea_UK)
- Light-year (ly)
- Micrometre (µm)
- Mil (mil)
- Millimetre (mm)
- Nanometre (nm)
- Nautical mile (international) (nmi)
- Statute mile (mi)
- Parsec (pc)
- Pica (pica)
- Picometre (pm)
- Point (pt)
- Rod (rd)
- Yard (yd)