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## User Guide

This metric, imperial and si unit length measuring converter and conversion scale can be used to convert any measurement of length from one unit of length to another.

### Conversion Factors

The following units and associated conversion factors in metres (SI units for length) are used by this length converter:

- nanometre (nm) – 0.000000001 m
- micrometre (µm) – 0.000001 m
- thousandth of an inch (thou) – 0.0000254 m
- millimetre (mm) – 0.001 m
- centimetre (cm) – 0.01 m
- inch (in) – 0.0254 m
- foot (ft) – 0.3048 m
- yard (yd) – 0.9144 m
- metre (m) – 1 m
- kilometre (km) – 1,000 m
- mile (mi) – 1,609.344 m
- nautical mile (nmi) – 1,852 m
- astronomical unit (AU) – 149,597,870,700 m
- light year (ly) – 9,460,730,472,580,800 m
- parsec (pc) – 30,856,775,814,671,900 m

## Tool Help

### How precise is the conversion?

The converted answer is displayed to a precision of 9 significant figures

### What does an answer that looks like 2.67e+16 mean?

These are standard form numbers, which are used when there too many zeros either size of the decimal point, therefore a length that is displayed as 2.67e+16 is short for 2,670,000,000,000,000,000 or 6.898e-8 is short for 0.00000006898.

### Convert cable length to nautical miles

*What is cable length? One cable is equal to how many nautical miles?*

1 cable length (international) = 1/10 nautical mile (international)

It is an obsolete unit of length, this glossary of nautical measures explains a little of the history of the cable length.