This page offers information on the metric system and metric conversion. The following related pages may also be of interest:
For accuracy, the converters below use the official conversion rates (which are up to 13 digits). However, for ease of use, the reference table (chart) under each converter rounds off to the nearest 2nd digit.
Length Conversion
For length, there is no difference between USA and Imperial measures.
Imperial/USA unit

Metric (SI) unit


Metric (SI) unit

Imperial/USA unit

Inch

2.54 centimeters


Centimeter

0.39 inches

Foot

30.48 centimeters


Meter

3.28 feet

Yard

0.91 meters


Meter

1.09 yards

Mile

1.61 kilometers


Kilometer

0.62 miles

Weight (or mass) conversion
Imperial/USA unit

Metric (SI) unit


Metric (SI) unit

Imperial/USA unit

Ounce (weight)

28.35 grams


Gram

0.035 ounces

Pound

0.45 kilograms


Kilogram

2.21 pounds

UK ton (2240 pounds)

1.02 metric tons


Metric ton (1000 kg.)

0.98 UK tons

US ton (2000 pounds)

0.91 metric tons


Metric ton (1000 kg.)

1.10 US tons

The USA and Imperial systems of measurement use the same ounce and pound. The USA ton (also known as the "short ton" is 2000 pounds, the UK ton (also known as the "long ton") is 2240 pounds, and the metric ton is 1000 kg.
In the metric (SI) system, the term mass is used instead of weight. Weight is a measure of how heavy something is, whereas mass is a measure of the amount of matter. To illustrate, something that weighs 60 pounds on the earth would only weigh about 10 pounds on the moon (due to the lower gravity of the moon), whereas something the has a mass of 60 Kilograms on the earth would still have a mass of 60 kilograms on the moon (as the amount of matter is unchanged). Consequently, the statement that 1 kilogram is 2.21 pounds is true here on earth but not elsewhere (a point mainly of interest to scientists).
Temperature Conversion
