# Earth measurements

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**Earth measurements** are used as the standard units of measure used in the United Federation of Planets.

*It is possible that the UFP does not actually use Earth measurements, but that their usage on screen is an example of "implicit translation" (such as the characters in the film*K-19: The Widowmaker

*speaking English when the viewer understands that they are "speaking" Russian.) This is implied by scenes such as the one where Kirk remarks to Abraham Lincoln that the*Enterprise

*could convert to minutes.*(TOS: "The Savage Curtain")

## Length

### Meter

A **meter** (m) is the fundamental SI unit of length, defined as the distance traveled by light in a vacuum in 1/299,792,458 second.

In the Imperial units system 1 foot ≡ 0.3048 m.

#### centimeter

A **centimeter** (cm) is an SI unit of length equal to 1/100 of a meter.

1 cm ≈ 0.39370 inches.

**See also:**Centimeter at Wikipedia

#### kilometer

A **kilometer** (km) is an SI 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.

**See also:**Millimeter at Wikipedia

### Micron

A **micron** is another name for **micrometer** (µm), an SI unit of length equal to 1 millionth of a meter (1 ×10^{−6} m).

1 mil ≡ 25.4 μm.

**See also:**Micrometer at Wikipedia

### Mile

A **mile** (mi) was originally one thousand paces, or 5,000 Roman feet (~4,850 Imperial feet). A later British reform changed the mile to 5,280 Imperial feet so that it would equal eight furlongs.

1 mi ≡ 1.609344 km.

### Foot

A **foot** (ft, plural **feet**) is an Imperial unit of length equal to twelve inches, or one third of a yard.

1 ft ≡ 0.3048 m.

### Inch

An **inch** (in) was originally based on the width of the average man's thumb, or the length of three barleycorns. It was later redefined based on SI units.

1 in ≡ 2.54 cm.

### Light year

(*Main Article: Light year*)

One light year is the distance that light travels in one Earth year. It is approximately equal to 9.46^{15} meters, or 5.88 ×10^{12} miles.

## 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.

## Time

See: Time measurements

## 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:**Milliliter at Wikipedia

### cc

A **cc** (**cubic centimeter**, official cm^{3}) 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.

**See also:**cc at Wikipedia**See also:**Drug dosage

### cubic meter

During a sensor sweep of the Neutral zone, the USS *Enterprise*-E found 25 particles of dust per cubic meter. (*Star Trek: First Contact*)

## Units

### Gross

A **gross** is equal to a dozen dozen.