## Length Calculator

# Length Converter

Length conversion calculator – convert different length units.

Mm, cm, m, km, in, ft, yd and mi conversion calculator.

## Metric Measurement System

The metric measurement system known as the** International System of Units (SI)**, is an international decimal system of weights and measures. It is used all over the world and it is easy to use.

Four base units of metric measurement system are:

*meter (*for length**m**)*kilogram (*for mass ( weight converter)**kg**)*second (*for time**s**)*ampere (*for electromagnetism (amp converter)**A**)

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

All other length units and distance measurements in the metric system comes from the meter. Here is an ecample

**1 km= 1000 m -> 1m = 1000 mm**

### Imperial or American Measurements

Imperial measurements have a less logical explanation but it is widely used in the U.S.

A yard (**yd**) can be defined as the length of a pendulum that causes its arc to swing in exactly 1 second.

The Nautical mile (**mi**) is the distance across 1′ (1/60 of a degree) around the earths surface.

The inch (**in**) is a unit of length in Imperial / the US metric system. The measure comes from **the width of a human thumb**.

**1 in = 2.54 cm**

The foot (**ft**) is a unit of length in an Imperial / US metric system. It’s a measurement based on the human body. The unit was standardized in the 1950s, and since then it is equal to 0.3048 m.

1 ft = 0.3048 m = 304.8 mm

## Length Conversion Table

A length conversion table is an a table where length measurement units are converted to other units.

The conversion table have the conversion factors between each unit of length.

The table consists of a few common units from the Metric system of measurement and from the Imperial system of measurement.

The table can be used directly to convert units without using any calculators or converters.