Metric - US Customary and Imperial Conversion Charts
Length :: Area :: Volume/Capacity :: Mass (weight) :: Temperature
When you need to convert between Metric and US Customary or Imperial units, the tables below can help.
Or you can use the Unit Converter
Example 1: Convert 500 millimeters to inches
500 mm × 0.03937 = 19.7 inches
Example 2: Convert 500 millimeters to feet
500 mm x 0.03937 = 19.7 inches, and there are 12 inches in a foot, so
19.7 inches12 inches/foot = 1.64 feet (or 1 foot and 7.7 inches)
Note: values are accurate to 4 significant digits only.
Length
| Metric | US or Imperial | ||
|---|---|---|---|
| 1 millimeter [mm] |  |
0.03937 in | |
| 1 centimeter [cm] | 10 mm | |
0.3937 in |
| 1 meter [m] | 100 cm | |
1.0936 yd |
| 1 kilometer [km] | 1000 m | |
0.6214 mile |
| US or Imperial | Metric | ||
|---|---|---|---|
| 1 inch [in] | |
2.54 cm | |
| 1 foot [ft] | 12 in | |
0.3048 m |
| 1 yard [yd] | 3 ft | |
0.9144 m |
| 1 mile | 1760 yd | |
1.6093 km |
| 1 int nautical mile | 2025.4 yd | |
1.852 km |
Area
| Metric | US or Imperial | ||
|---|---|---|---|
| 1 sq cm [cm2] | 100 mm2 | |
0.1550 in2 |
| 1 sq m [m2] | 10,000 cm2 | |
1.1960 yd2 |
| 1 hectare [ha] | 10,000 m2 | |
2.4711 acres |
| 1 sq km [km2] | 100 ha | |
0.3861 mile2 |
| US or Imperial | Metric | ||
|---|---|---|---|
| 1 sq inch [in2] | |
6.4516 cm2 | |
| 1 sq foot [ft2] | 144 in2 | |
0.0929 m2 |
| 1 sq yd [yd2] | 9 ft2 | |
0.8361 m2 |
| 1 acre | 4840 yd2 | |
4046.9 m2 |
| 1 sq mile [mile2] | 640 acres | |
2.59 km2 |
Volume/Capacity
| Metric | US Customary | Imperial | ||
|---|---|---|---|---|
| 1 cu cm [cm3] | |
0.0610 in3 | ||
| 1 cu decimeter [dm3] | 1,000 cm3 | |
0.0353 ft3 | |
| 1 cu meter [m3] | 1,000 dm3 | |
1.3080 yd3 | |
| 1 liter [l] | 1 dm3 | |
2.113 fluid pt | 1.7598 pt |
| US Customary | Imperial | Metric | |
|---|---|---|---|
| 1 cu inch [in3] | |
16.387 cm3 | |
| 1 cu foot [ft3] | |
0.02832 m3 | |
| 1 fluid ounce | 1.0408 UK fl oz | |
29.574 mL |
| 1 pint (16 fl oz) | 0.8327 UK pt | |
0.4732 liters |
| 1 gallon (231 in3) | 0.8327 UK gal | |
3.7854 liters |
Mass
| Metric | US or Imperial | ||
|---|---|---|---|
| 1 milligram [mg] | |
0.0154 grain | |
| 1 gram [g] | 1,000 mg | |
0.0353 oz |
| 1 kilogram [kg] | 1,000 g | |
2.2046 lb |
| 1 tonne [t] | 1,000 kg | |
1.1023 short ton |
| 1 tonne [t] | 1,000 kg | |
0.9842 long ton |
| US or Imperial | Metric | ||
|---|---|---|---|
| 1 ounce [oz] | 437.5 grain | |
28.35 g |
| 1 pound [lb] | 16 oz | |
0.4536 kg |
| 1 stone | 14 lb | |
6.3503 kg |
| 1 hundredweight [cwt] | 112 lb | |
50.802 kg |
| 1 short ton (US) | |
0.9072 t | |
| 1 long ton (UK) | |
1.0160 t | |
Temperature
To convert from Celsius to Fahrenheit, first multiply by 9/5, then add 32.
To convert from Fahrenheit to Celsius, first subtract 32, then multiply by 5/9
(To discover why, visit the Temperature Conversion page)
History of Measurement
Years ago people came up with standard length measures, but they didn't all agree on one system.
The Imperial System (which uses yards, feet, inches, and so on) developed over hundreds of years in the UK. The Metric System was developed in France in the late 1700s and later spread through Europe and beyond. The USA and a few other countries still mainly use feet and inches.