Unit conversions index.
All 111 unit converters on this site, grouped by category. Each page gives the exact formula, a worked example, a reference table and a live converter.
Length (19) · Mass (10) · Volume (18) · Temperature (5) · Pressure (14) · Torque (2) · Force (3) · Power (7) · Energy (8) · Area (6) · Speed (6) · Time (4) · Frequency (2) · Angle (2) · Data (3) · Electrical (2)
Length
cm → ft in
Convert centimeters to feet and inches.
cm → in
Convert centimeter to inch.
cm → mm
Convert centimeter to millimeter.
ft → in
Convert foot to inch.
ft → m
Convert foot to meter.
in → cm
Convert inch to centimeter.
in → ft
Convert inch to foot.
in → m
Convert inch to meter.
in → mm
Convert inch to millimeter.
km → mi
Convert kilometer to mile.
m → ft
Convert meter to foot.
m → in
Convert meter to inch.
m → yd
Convert meter to yard.
mi → km
Convert miles to km.
mm → cm
Convert millimeter to centimeter.
mm → in
Convert millimeter to inch.
nmi → km
Convert nautical mile to kilometer.
nmi → mi
Convert nautical mile to mile.
yd → m
Convert yard to meter.
Mass
g → oz
Convert gram to ounce.
kg → lb
Convert kilogram to pound.
kg → st
Convert kilogram to stone.
lb → kg
Convert pound to kilogram.
lb → st
Convert pound to stone.
oz → g
Convert ounce to gram.
st → kg
Convert stone to kilogram.
st → lb
Convert stone to pound.
t → ton-us
Convert metric ton to short ton (US).
ton-us → t
Convert short ton (US) to metric ton.
Volume
cup-us → L
Convert cup (US) to liter.
cup-us → mL
Convert cup (US) to milliliter.
floz-us → mL
Convert fluid ounce (US) to milliliter.
ft³ → m³
Convert cubic foot to cubic meter.
gal-uk → gal-us
Convert gallon (UK / imperial) to gallon (US).
gal-us → gal-uk
Convert gallon (US) to gallon (UK / imperial).
gal-us → L
Convert gallon (US) to liter.
gal-us → m³
Convert gallon (US) to cubic meter.
L → cup-us
Convert liter to cup (US).
L → gal-us
Convert liter to gallon (US).
m³ → ft³
Convert cubic meter to cubic foot.
m³ → gal-us
Convert cubic meter to gallon (US).
mL → cup-us
Convert milliliter to cup (US).
mL → floz-us
Convert milliliter to fluid ounce (US).
mL → US tbsp
Convert milliliter to tablespoon (US).
mL → US tsp
Convert milliliter to teaspoon (US).
US tbsp → mL
Convert tablespoon (US) to milliliter.
US tsp → mL
Convert teaspoon (US) to milliliter.
Temperature
C → F
Convert Celsius to Fahrenheit.
C → K
Convert Celsius to Kelvin.
F → C
Convert Fahrenheit to Celsius.
F → K
Convert Fahrenheit to Kelvin.
K → C
Convert Kelvin to Celsius.
Pressure
atm → bar
Convert standard atmosphere to bar.
atm → psi
Convert standard atmosphere to pound-force per square inch.
bar → atm
Convert bar to standard atmosphere.
bar → kPa
Convert bar to kilopascal.
bar → psi
Convert bar to pound-force per square inch.
inHg → mbar
Convert inch of mercury to millibar.
kPa → bar
Convert kilopascal to bar.
kPa → psi
Convert kilopascal to pound-force per square inch.
MPa → psi
Convert megapascal to pound-force per square inch.
psi → atm
Convert pound-force per square inch to standard atmosphere.
psi → bar
Convert pound-force per square inch to bar.
psi → kPa
Convert pound-force per square inch to kilopascal.
psi → MPa
Convert pound-force per square inch to megapascal.
torr → kPa
Convert torr (≈ mmHg) to kilopascal.
Torque
ft·lb → N·m
Convert foot-pound (pound-foot) to newton-meter.
N·m → ft·lb
Convert newton-meter to foot-pound (pound-foot).
Force
kgf → N
Convert kilogram-force to newton.
lbf → N
Convert pound-force to newton.
N → lbf
Convert newton to pound-force.
Power
BTU/h → kW
Convert BTU per hour to kilowatt.
hp → kW
Convert horsepower (mechanical) to kilowatt.
hp → W
Convert horsepower (mechanical) to watt.
kW → BTU/h
Convert kilowatt to BTU per hour.
kW → hp
Convert kilowatt to horsepower (mechanical).
ton → kW
Convert ton of refrigeration to kilowatt.
W → hp
Convert watt to horsepower (mechanical).
Energy
BTU → kJ
Convert BTU to kilojoule.
cal → J
Convert calorie to joule.
eV → J
Convert electron-volt to joule.
ft·lbf → J
Convert foot-pound (force) to joule.
kcal → kJ
Convert kilocalorie (food cal) to kilojoule.
kJ → BTU
Convert kilojoule to BTU.
kJ → kcal
Convert kilojoule to kilocalorie (food cal).
kWh → kJ
Convert kilowatt-hour to kilojoule.
Area
acre → ha
Convert acre to hectare.
acre → m²
Convert acre to square meter.
ft² → m²
Convert square foot to square meter.
ha → acre
Convert hectare to acre.
m² → acre
Convert square meter to acre.
m² → ft²
Convert square meter to square foot.
Speed
km/h → mph
Convert kilometers per hour to miles per hour.
kn → km/h
Convert knot to kilometers per hour.
kn → mph
Convert knot to miles per hour.
m/s → km/h
Convert meters per second to kilometers per hour.
m/s → mph
Convert meters per second to miles per hour.
mph → km/h
Convert miles per hour to kilometers per hour.
Time
d → h
Convert day to hour.
h → min
Convert hour to minute.
min → s
Convert minute to second.
yr → d
Convert year (365 d) to day.
Frequency
Angle
Data
GB → GiB
Convert gigabyte (1000³) to gibibyte (1024³).
MB → MiB
Convert megabyte (1000²) to mebibyte (1024²).
TB → TiB
Convert terabyte to tebibyte.