Earth measurements are used as the standard unit of measurement in the United Federation of Planets.

## Length

### Kilometer

A kilometer (km) is an SI (System Internationale) unit of length equal to one thousand meters.

1 km ~ 0.62137 miles

### Millimeter

A millimeter (mm) is an SI unit of length equal to 1/1,000 of a meter.

1 mm ~ 0.03937 inches

### Inch

An inch (in) was originally based on the width of an average person's thumb. It was later refined based on SI units.

1 inch ~ 2.54 cm

## Mass

### Kilogram

A kilogram (kg) is the fundamental SI unit of mass.

In the Imperial units system 1 pound ≡ 0.45359237 kg.

#### Gram

A gram (g) is an SI unit of mass equal to 1/1,000 of a kilogram.

1 ounce ≡ 28.349523 g.

#### Milligram

A milligram (mg) is an SI unit of mass equal to 1/1,000 of a gram.

See also: Orders of magnitude (mass)#10-6 to one kg article at Wikipedia, the free encyclopedia.

## Volume

### Liter

A liter (L or l) is a derived SI unit of volume, equal to 1/1,000 cubic meters (1 cubic decimeter).

In the Imperial units system 1 gallon ≡ 4.54609 L (~277.42 cubic inches).

In the US system, 1 gallon ≡ 231 cubic inches ≡ 3.785411784 l.

#### milliliter

A milliliter (ml) is an SI unit of volume equal to 1/1,000 of a liter.

In the Imperial system 1 fluid ounce ≡ 28.4130625 ml.

In the US system, 1 fluid ounce ≡ 29.5735295625 ml.

See also: Litre#SI prefixes applied to the litre article at Wikipedia, the free encyclopedia.

### cc

A cc (cubic centimeter, official cm3) is a measure of volume equal to one cubic centimeter (cm), which is also equal to one milliliter (ml). The cc is a common term for milliliter used in measuring the dosage of liquid medicines by volume.

1 cubic inch ≡ 16.387964 ml ≡ 16.387964 cc.