Online conversion of imperial and metric units of measurement

Imperial and Metric Units' Online Conversion Standard \| Mobile


♣ Area	Energy	Flowrate	Force

Length	Mass	Power	Pressure

Temperature	Velocity	Volume	App

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* Click here for the units' list in categorical order

Mass

Length

Volume

Area

Velocity

Energy

Force

Flowrate

Power

Pressure

Temperature

Worldwide use of the Metric System and Date of Metrication

* The United States of America, Burma and Liberia have not yet adopted the Metric System (SI).

Conversion Table

U.S. unit	Metric equivalent
Metric unit	U.S. equivalent

Inch (in)

Centimeter (cm)

2.54 centimeters

0.394 inch

Foot (ft)

Meter (m)

0.305 meter

3.28 feet

Yard (yd)

Meter (m)

0.914 meter

1.09 yard

Mile (mi)

Kilometer (km)

1.61 kilometer

0.621 mile

Square inch (in²)

Square centimeter (cm²)

6.45 square centimeters (cm²)

0.155 square inch (in²)

Square foot (ft²)

Square meter (m²)

0.093 square meter (m²)

10.8 square feet (ft²)

Square yard (yd²)

Square meter (m²)

0.836 square meter (m²)

1.2 square yard (yd²)

Square mile (mi²)

Square kilometer (km²)

2.56 square kilometers (km²)

0.386 square mile (mi²)

Acre

Hectare (ha)

0.405 hectare

2.47 acres

Cubic foot (ft³)

Cubic meter (m³)

0.028 cubic meter (m³)

35.28 cubic feet (ft³)

Quart (qt)

Liter (l)

0.946 liter

1.06 quart

Gallon

Cubic inch (in³)

231 cubic inches (in³)

0.0043 gallon

Ounce (oz)

Gram (g)

28.3 grams

0.035 ounce

Pound (lb)

Kilogram (kg)

0.454 kilogram

2.2 pounds

Units per conversion type

Area

square meter (m²)
are (a) = 100 sq. meters (m²)
hectare (ha) = 100 Ares = 10 000 sq. meters
square kilometer (km²) = 100 hectares = 10000 Ares = 1 000 000 sq. meters
square mega meter (Mm²) = 1 000 000 000 000 sq. meters
square foot = 144 sq. inches = 0.09290304 sq. meters
square yard = 9 sq. feet = 0.83612736 sq. meters
square perch = 30.25 sq. yards = 25.2928526 sq. meters
acre = 10 sq. chains = one furlong by one chain = 160 sq. perches = 4840 sq. yards = 43 560 sq. feet = 4046.8564224 sq. meters
square mile = 640 acres = 2.589988110336 sq. kilometers

Metric System		Imperial
1 square centimeter [cm²]	100 square millimeters	0.001076391 square feet
1 square meter [m²]	10000 square centimeters	1.19599004630 square yard
1 hectare [ha]	10000 square meters	2.47105381467 acres
1 square kilometer [km²]	100 hectares	0.38610215854 square mile

Imperial		Metric System
1 square inch [in²]		6.4516 square centimeters
1 square foot [ft²]	144 square inches	0.09290303999 square meter
1 square yard [yd²]	9 square feet	0.83612736 square meter
1 acre	4840 square yards	4046.8564224 square meters
1 square mile	640 acres	2.589988110336 square kilometers

Length

Main length units:

meter
centimeter
kilometer
inch
foot
yard
mile
light-year (astronomical unit)
parsec (astronomical unit)
angstrom (microscopic unit)

Metric System		Imperial
1 millimeter [mm]		0.03937007874 inch
1 centimeter [cm]	10 millimeters	0.3937007874 inch
1 meter [m]	100 centimeters	1.09361329833 yard
1 kilometer [km]	1000 meters	0.62137119223 mile

Imperial		Metric System
1 inch [in]		2.54 centimeters
1 foot [ft]	12 inches	0.3048 meter
1 yard [yd]	3 feet	0.9144 meter
1 mile	1760 yards	1.609344 kilometer

Weight and Mass

Main weight units:

gram (g) = ¹⁄₁₀₀₀ kg
kilogram (kg)
tonne (t)= 1 000 kg
electronvolt (eV)
atomic mass unit (u)
slug (sl)
pound (lb)
Planck mass (m_P)
solar mass (M_⊙)
Compton wavelength
Schwarzschild radius

Metric System		Imperial
1 milligram [mg]		0.01543209876 grain
1 gram [g]	1000 milligrams	0.03527399072 ounce
1 kilogram [kg]	1000 grams	2.20458553791 pounds
1 tonne [t]	1000 kilograms	0.98418997228 ton

Imperial		Metric System
1 ounce [oz]	437.4922839506173 grains	28.3495 grams
1 pound [lb]	16 ounces	0.4536 kilogram
1 stone	14 pounds	6.35 kilograms
1 hundredweight [cwt]	112 pounds	50.8032 kilograms
1 ton	20 hundredweights	1.016064 tonne

Volume

Main volume units:

cubic inch (cu in) or (in³)
cubic foot (cu ft) or (ft³)
cubic yard (cu yd) or (yd³)
acre foot (acre ft)
minim (min)
US fluid dram (fl dr)
teaspoon (tsp)
tablespoon (Tbsp)
US fluid ounce (fl oz)
jigger (jig)
US gill (gi)
US cup (cp)

US pint (pt)
US quart (qt)
US gallon (gal)
barrel (bbl)
hogshead
pint (pt)
quart (qt)
gallon (gal)
peck (pk)
bushel (bu)
fluid ounce (fl oz)
gill

Metric System		Imperial
1 cubic centimeter [cm³]		0.06102361003 cubic inch
1 cubic decimeter [dm³]	1000 cubic centimeters	0.03531458914 cubic foot
1 cubic meter [m³]	1000 cubic decimeters	1.30794774594 cubic yard
1 liter [l]	1 cubic decimeter	1.75975011548 pint
1 hectoliter [hl]	100 liters	21.9968764435 gallons

Imperial		Metric System
1 cubic inch [in³]		16.3871 cubic centimeters
1 cubic foot [ft³]	1728 cubic inch	0.0283169088 cubic meter
1 fluid ounce [fl oz]		28.413125 milliliters
1 pint [pt]	20 fluid ounces	0.5682625 liter
1 gallon [gal]	8 pints	4.5461 liters

Energy

Main energy units:

ergs
calories
joule
kilowatt hour = 3.6 million joules
British thermal unit (BTU) = 1055 joules (approx.)

Flow rate

Definition: volume of fluid passing through a particular surface per unit time (i.e.: cubic meters per minute or cubic feet per minute).

Symbol: Q.

Also know as:

volumetric flow rate
volume flow rate
rate of fluid flow

Force

Force units:

Newton
dyne
kilogram-force
pound-force
poundal

Power

Main power units:

watt (W) = 1 joule per second
ergs per second (erg/s)
horsepower (hp) = 33 000 foot-pounds per minute = 746 watts
metric horsepower [Pferdestärke (PS) or cheval vapeur (CV)]
foot-pounds per minute
dBm
calories per hour
kilocalories per hour
Btu per hour (Btu/h)
tons of refrigeration = 12 000 Btu/h

Pressure

Main pressure units:

Pascal (Pa) = one Newton per square meter
pound per square inch (psi)
bar
barye (ba) = dyne per square centimeter
hectoPascal (hPa)
kiloPascal (kPa)
millibar (mbar)
inch of mercury (inHg)
decibar (dbar) = increase of 1 meter (depth)
rule of thumb (for scuba divers)
standard atmosphere (atm) = 101 325 Pa = 101.325 kPa = 1013.25 hPa

millimeters of mercury (mmHg) = one torr
inches of mercury
millimeter, centimeter, meter, inch and foot of water
kip, ton-force (short), ton-force (long), pound-force, ounce-force and poundal per square inch
kg-force, or kilopond, per square cm
gram-force and tonne-force (metric ton-force per square cm
kg-force and tonne-force per square meter
sthene per square meter (pieze)

Temperature

Main temperature units:

Kelvin (K)
Celsius
Fahrenheit
electronvolts (eV)= 11 605 K
kiloelectronvolts (keV)
Rankine

Velocity

Main velocity units:

Meters per second (m s⁻¹ or m/s)
Kilometers per hour (km/h)
Miles per hour (mph)
Knots (nautical miles per hour [kn or kt])
Feet per second (fps or ft/s)
Mach number = speed divided by the speed of sound
Speed of light in vacuum (c = 299 792 458 m/s)

Imperial and Metric Units' Online Conversion

Worldwide use of the Metric System and Date of Metrication

Conversion Table

Units per conversion type