Conversion Factors
Table 1 The relationship between English and SI (metric) length units Both four and eight digits are given for each relationship. Four digits are usually adequate for English‑SI conversions.
Metric |
English |
English |
Metric |
|
kilometer (km) |
0.6214 mi |
mile (mi) |
1.609 km |
|
3281 ft |
1609 m |
|||
meter (m) |
3.281 ft |
|||
39.37 in. |
yard (yd) |
0.9144 m (exact) |
||
1.094 yd |
91.44 cm (exact) |
|||
centimeter (cm) |
0.3937 in. |
|||
0.03281 ft |
foot (ft) |
30.48 cm (exact) |
||
millimeter (mm) |
3.937×10-2 in. |
0.3048 m (exact) |
||
micrometer (mm) |
3.937×10-5
in. |
|||
nanometer (nm) |
3.937×10-8 in. |
inch (in.) |
2.54 cm (exact) |
|
0.0254 m (exact) |
Table 2 The relationship between English mass units and SI (metric) mass units Both four and eight digits are given for each relationship. Four digits are usually adequate.
Metric Mass |
English Mass |
English Mass |
Metric Mass |
|
metric ton (ton) |
1.102 ton (short) |
ton (ton) |
0.9072 t (metric tons) |
|
2205 lb |
907.2 kg |
|||
kilogram (kg) |
2.205 lb |
|||
0.001102 ton |
pound (lb) |
453.6 g |
||
gram (g) |
0.002205 lb |
|
0.4536 kg |
|
0.03527 oz |
||||
milligram (mg) |
3.527×10-5
oz |
ounce (oz) |
28.35 g |
|
microgram (mg) |
3.527×10-8
oz |
2.835×104
mg |
Table 3 The relationship between English and SI (metric) volume units Both four and seven digits are given for each relationship. Four digits are usually adequate.
Metric |
English |
English |
Metric |
|
liter (L) |
1.057 qt |
gallon (gal) |
3.785 L |
|
0.2642 gal |
3785 mL |
|||
33.81 fl oz |
quart (qt) |
0.9463 L |
||
61.03 cu in. |
946.3 mL |
|||
milliliter (mL) |
0.03381 fl oz |
fluid ounce (fl oz) |
0.02957 L |
|
0.06103 cu in. |
29.57 mL |
|||
microliter (mL) |
3.381×10-5
fl oz |
cubic inch (cu in.) |
16.39 cm3
|
|
cubic centimeter (cm3) |
0.03381 fl oz |
16.39 mL |
||
0.06103 cu in. |
0.1634 L |
* There are three kinds of gallons, quarts, and fluid ounces: British, U.S. dry, and U.S. liquid. The values given here are for U.S. liquid gallons, quarts, and fluid ounces.