Length

inches to millimeters

25.4 
millimeters to inches

0.0393701

feet to meters

0.3048 
meters to feet

3.28084

yards to meters

0.9144 
meters to yards

1.09361

furlongs to km

0.201168 
km to furlongs

4.97097

miles to km

1.609344 
km to miles

0.621371

Area

square inches to square
cent 
6.4516 
square
cent to
square inches 
0.1550

square feet to square
meters 
0.092903 
square meters to square
feet 
10.7639

square yards to square
meters 
0.836127 
square meters to square
yards 
1.19599

square miles to square
km 
2.589988 
square
km to
square miles 
0.386102

acres to square meters

4046.856422

square meters to acres

0.000247

acres to hectares

0.404866 
hectares to acres

2.469955


Volume/Capacity 
cubic inches to cubic
cent 
16.387064 
cubic
cent to
cubic inches 
0.061024

cubic feet to cubic
meters 
0.028317 
cubic meters to cubic
feet 
35.3147

cubic yards to cubic
meters 
0.764555 
cubic meters to cubic
yards 
1.30795

cubic miles to cubic
km 
4.1682 
cubic
km to cubic
miles 
0.239912

fluid ounces (U.S.) to
milliliters 
29.5735 
milliliters to fluid
ounces (U.S.) 
0.033814

fluid ounces (imperial)
to milliliters 
28.413063 
milliliters to fluid
ounces (imperial) 
0.035195

pints (U.S.) to liters

0.473176 
liters to pints (U.S.)

2.113377

pints (imperial) to
liters 
0.568261 
liters to pints
(imperial) 
1.759754

quarts (U.S.) to liters

0.946353 
liters to quarts (U.S.)

1.056688

quarts (imperial) to
liters 
1.136523 
liters to quarts
(imperial) 
0.879877

gallons (U.S.) to liters

3.785412 
liters to gallons (U.S.)

0.264172

gallons (imperial) to
liters 
4.54609 
liters to gallons
(imperial) 
0.219969

Mass/Weight

ounces to grams

28.349523 
grams to ounces

0.035274

pounds to kilograms

0.453592 
kilograms to pounds

2.20462

stone (14 lb) to
kilograms 
6.350293 
kilograms to stone (14
lb) 
0.157473

tons (U.S.) to kilograms

907.18474 
kilograms to tons (U.S.)

0.001102

tons (imperial) to
kilograms 
1016.046909

kilograms to tons
(imperial) 
0.000984

tons (U.S.) to metric
tons 
0.907185 
metric tons to tons
(U.S.) 
1.10231

tons (imperial) to metric
tons 
1.016047 
metric tons to tons
(imperial) 
0.984207

Speed

miles per hour to
km per hour 
1.609344 
km per hour to
miles per hour 
0.621371

feet per second to meters
per second 
0.3048 
meters per second to feet
per second 
3.28084

Force

poundforce to newton

4.44822 
newton to poundforce

0.224809

kilogramforce to newton

9.80665 
newton to kilogramforce

0.101972

Pressure

poundforce per square
inch to kilopascals 
6.89476 
kilopascals to
poundforce per square inch 
0.145038

tonsforce per square
inch (imperial) to megapascals 
15.4443 
megapascals to tonsforce
per square inch (imperial) 
0.064779

atmospheres to newtons
per square centimeter

10.1325 
newtons per square
centimeter to atmospheres

0.098692

atmospheres to
poundforce per square inch 
14.695942 
poundforce per square
inch to atmospheres 
0.068948

Energy

calorie to joule

4.1868 
joule to calorie

0.238846

watthour to joule

3,600 
joule to watthour

0.000278

Power

horsepower to kilowatts

0.7457 
kilowatts to horsepower

1.34102

Fuel
consumption 
miles per gallon (U.S.)
to km per liter

0.4251 
km per liter to
miles per gallon (U.S.)

2.3521

miles per gallon
(imperial) to km per liter 
0.3540 
km per liter to
miles per gallon (imperial) 
2.824859

gallons per mile (U.S.)
to liters per kilometer

2.3521 
liters per kilometer to
gallons per mile (U.S.)

0.4251

gallons per mile
(imperial) to liters per kilometer 
2.824859 
liters per kilometer to
gallons per mile (imperial) 
0.3540
