Imperial and Metric Units' Online Conversion

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♣
 Area

   Energy Units
Energy		   Flowrate Units
Flowrate		   Force Units
Force
             
Length Units
Length		   Mass Units
Mass		   Power Units
Power		   Pressure Units
Pressure
             
Temperature Units
Temperature		   Velocity Units
Velocity		   Volume Units
Volume		  
App
             

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* Click here for the units' list in categorical order

Mass

 

In
 

=  

 
Length

 

In
 

=  

 
Volume

 

In
 

=  

 
Area

 
In
 

=  

 
Velocity

 

In
 

=  

 
Energy

 

In
 

=  

 
Force

 
In
 

=  

 
Flowrate

 
In
 

=  

 
Power

 
In
 

=  

 
Pressure

 

In
 

=  

 
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).
Metrication per country

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 (mP)
  • 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)


 

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