(covers information from several alternate timelines)

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

*It is possible that the UFP did 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 Edit

### MeterEdit

A **meter** (**m**) was 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.

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#### NanometerEdit

A **nanometer** (**nm**) was an SI unit of length equal to one billionth of a meter (1 ×10^{−9} m).

1 nm ≈ 0.00000000003937 inches.

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#### MillimeterEdit

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

1 mm ≈ 0.03937 inches.

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#### CentimeterEdit

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

1 cm ≈ 0.3937 inches.

*Lucille Harewood's height was given in centimeters on her medical status display at Royal Children's Hospital in an alternate reality 2259. ( Star Trek Into Darkness)*

In 2374, Odo tricked Miles O'Brien and Julian Bashir into believing that they were still a couple of centimetres shorter than normal after being shrunk and regrown again. (DS9: "One Little Ship")

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#### KilometerEdit

A **kilometer** (**km**) was an SI unit of length equal to one thousand meters.

1 km ≈ 0.62137 miles.

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### Micron Edit

A **micron** was 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.

The absorption depth of osmium alloy was at least twenty-thousand particles per micron. (ENT: "The Catwalk")

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### Mile Edit

(*Main article: 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.

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### Nautical mile Edit

A **nautical mile** was based on the length of one minute of arc of a great circle.

1 nautical mile ≡ 1,852 m (∼6,076.12 ft)

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### FootEdit

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

1 ft ≡ 0.3048 m.

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### Inch Edit

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

1 in ≡ 2.54 cm.

A passage from Alice's Adventures in Wonderland described Alice being only ten inches high. (DIS: "Context Is for Kings")

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### Light year Edit

(*Main article: Light year*)

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

## Mass Edit

### Kilogram Edit

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

In the Imperial units system, 1 pound ≡ 0.45359237 kg.

*Lucille Harewood's weight was given in kilograms on her medical status display at Royal Children's Hospital in an alternate reality 2259.* (*Star Trek Into Darkness*)

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#### Gram Edit

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

1 ounce ≡ 28.349523125 g.

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#### Milligram Edit

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

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## Time Edit

See: Time measurements

## Volume Edit

### Liter Edit

A **liter** (**L** or **l**) was 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.

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#### Milliliter Edit

A **milliliter** (**ml**) was 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.

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### cc Edit

A **cc** (**cubic centimeter**, official **cm ^{3}**) was a measure of volume equal to one cubic centimeter (cm

^{3}), which was also equal to one milliliter (ml). The cc was a common term for milliliters used in measuring the dosage of liquid medicines by volume.

1 cubic inch ≡ 16.387064 ml ≡ 16.387064 cc.

**See also:**Drug dosage

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### Cubic meter Edit

When the crew was forced to take shelter in the ship's catwalk, T'Pol allowed Doctor Phlox fifteen cubic meters of space for his medical supply. Phlox later discussed this with T'Pol and she allowed him five more cubic meters to what Phlox answered, "*my Edosian slugs thank you.*" (ENT: "The Catwalk")

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 Edit

### Gross Edit

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