Converter hub
Length Converter
Length conversions cover the metric system, US customary units and nautical measures. The inch is defined as exactly 2.54 centimetres, which fixes every other imperial length unit. Pick a pair below or open the page for the exact factor, a worked example and a full chart.
Units in this category
Length conversions cover the metric system, US customary units and nautical measures. The inch is defined as exactly 2.54 centimetres, which fixes every other imperial length unit.
| Unit | Symbol | Definition |
|---|---|---|
| Kilometers | km | The kilometre is 1,000 metres and is the standard road-distance unit in most countries. |
| Meters | m | The metre is the SI base unit of length, defined by the speed of light in vacuum. |
| Centimeters | cm | The centimetre is one hundredth of a metre and is common in clothing and furniture sizes. |
| Millimeters | mm | The millimetre is one thousandth of a metre and is the usual unit for engineering tolerances. |
| Miles | mi | The international mile is exactly 1,609.344 metres, or 5,280 feet. |
| Yards | yd | The yard is exactly 0.9144 metres, or three feet. |
| Feet | ft | The foot is exactly 0.3048 metres, or twelve inches. |
| Inches | in | The inch is defined as exactly 2.54 centimetres, which anchors the whole imperial length system. |
| Nautical Miles | nmi | The nautical mile is exactly 1,852 metres and equals one minute of latitude. |
All length conversions
Every listed pair has its own page with the formula, examples and a chart. Choose the starting unit:
Miles (mi)
Nautical Miles (nmi)
Frequently asked questions
How many length units are supported?
9 units, which gives 24 one-way conversions.
Are the factors exact?
They follow SI and international definitions. Where a unit is approximate by nature (for example Mach, months or fuel economy), the page says so.
Can I convert in both directions?
Yes. Every pair page has a swap link and the calculator accepts any decimal value.