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← Definitions
Unit definitions
Learn what conversion units mean, where they are used, and how they relate to SI.
Search unit definitions
Length
Centimeter
cm
Decimeter
dm
Inch
in
Meter
m
Foot
ft
Kilometer
km
Mile
mi
Nautical mile
nmi
Mass
Kilogram
kg
Pound
lb
Gram
g
Ounce
oz
Temperature
Celsius
°C
Fahrenheit
°F
Kelvin
K
Area
Square meter
m²
Square centimeter
cm²
Square decimeter
dm²
Square kilometer
km²
Square foot
ft²
Square inch
in²
Square mile
mi²
Hectare
ha
Acre
ac
Volume
Liter
L
Milliliter
mL
Cubic meter
m³
Cubic centimeter
cm³
Cubic decimeter
dm³
Cubic foot
ft³
Cubic inch
in³
US gallon
gal
US quart
qt
US pint
pt
Cooking
Teaspoon
tsp
Tablespoon
tbsp
Cup
cup
Fluid ounce
fl oz
Speed
Meter per second
m/s
Kilometer per hour
km/h
Miles per hour
mph
Knot
kn
Feet per second
ft/s
Pressure
Pascal
Pa
Kilopascal
kPa
Bar
bar
Atmosphere
atm
Pounds per square inch
psi
Millimeter of mercury
mmHg
Energy
Joule
J
Kilojoule
kJ
Calorie
cal
Kilocalorie
kcal
Watt-hour
Wh
Kilowatt-hour
kWh
Power
Watt
W
Kilowatt
kW
Horsepower
hp
Metric horsepower
PS
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