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
0.62137119 mi

mile (mi)

1.609 km
1.609344 km (exact)

3281 ft
3280.8399 ft

1609 m
1609.344 m (exact)

meter (m)

3.281 ft
3.2808399 ft

39.37 in.
39.370079 in.

yard (yd)

0.9144 m (exact)

1.094 yd
1.0936133 yd

91.44 cm (exact)

centimeter (cm)

0.3937 in.
0.39370079 in.

0.03281 ft
0.032808399 ft

foot (ft)

30.48 cm (exact)

millimeter (mm)

3.937 x 10-2 in.
3.9370079 x 10-2 in.

0.3048 m (exact)

micrometer (mm)

3.937 x 10-5 in.
3.9370079 x 10-5 in.

nanometer (nm)

3.937 x 10-8 in.
3.9370079 x 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)
1.1023113 ton (short)

ton (ton)

0.9072 metric tons
0.90718474 metric tons

2205 lb
2204.6226 lb

907.2 kg
907.18474 kg

kilogram (kg)

2.205 lb
2.2046226 lb

0.001102 ton
0.0011023113 ton

pound (lb)

453.6 g
453.59237 g

gram (g)

0.002205 lb
0.0022046226 lb

 

0.4536 kg
0.45359237 kg

0.03527 oz
0.035273962 oz

milligram (mg)

3.527 x 10-5 oz
3.5273962  x 10-5 oz

ounce (oz)

28.35 g
28.349523 g

microgram (mg)

3.527 x 10-8 oz
3.5273962  x 10-8 oz

2.835 x 104 mg
2.8349523  x 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
1.056718 qt

gallon * (gal)

3.785 L
3.785306 L

0.2642 gal
0.2641795 gal

3785 mL
3785.306 mL

33.81 fl oz
33.81498 fl oz

quart * (qt)

0.9463 L
0.9463264 L

61.03 cu in.
61.02545 cu in.

946.3 mL
946.3264 mL

milliliter (mL)

0.03381 fl oz
0.03381497 fl oz

fluid ounce * (fl oz)

0.02957 L
0.02957270 L

0.06103 cu in.
0.06102545 cu in.

29.57 mL
29.57270 mL

microliter (mL)

3.381 x 10-5 fl oz
3.381497 x 10-5 fl oz

cubic inch (cu in.)

16.39 cm3
16.387064 cm3 (exact)

cubic centimeter (cm3)

0.03381 fl oz
0.03381497 fl oz

16.39 mL
16.387064 mL (exact)

0.06103 cu in.
0.06102545 cu in.

0.1634 L
0.16387064 L (exact)

* 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.