Millimetres to Metres Converter
Convert millimetres to metres — divide by a thousand. Results update as you type; exact factors shown.
One millimetre is 0.001 metres — see the exact factor, not a rounded rule of thumb.
How the millimetres to metres converter works
Every length is converted through the metre, the SI base unit of length. The inch has been defined as exactly 25.4 mm since the 1959 international yard and pound agreement, so a foot is exactly 0.3048 m, a yard 0.9144 m and a statute mile 1,609.344 m. The nautical mile is 1,852 m by international definition.
The UK is metric for most trade and science but keeps miles, pints, stone and mpg (with the imperial gallon) in daily life.
Common length conversions
| From | To | Units |
|---|---|---|
| 10 mm | 0.01 m | millimetres to metres |
| 50 mm | 0.05 m | millimetres to metres |
| 100 mm | 0.1 m | millimetres to metres |
| 250 mm | 0.25 m | millimetres to metres |
| 500 mm | 0.5 m | millimetres to metres |
| 900 mm | 0.9 m | millimetres to metres |
| 1,000 mm | 1 m | millimetres to metres |
| 1,200 mm | 1.2 m | millimetres to metres |
| 2,400 mm | 2.4 m | millimetres to metres |
| 3,000 mm | 3 m | millimetres to metres |
| 6,000 mm | 6 m | millimetres to metres |
| 10,000 mm | 10 m | millimetres to metres |
Units in this converter and their exact factors
| Unit | Symbol | One unit in metres |
|---|---|---|
| millimetre | mm | 0.001 metre |
| centimetre | cm | 0.01 metre |
| metre | m | 1 metre |
| kilometre | km | 1,000 metre |
| inch | in | 0.0254 metre |
| foot | ft | 0.3048 metre |
| yard | yd | 0.9144 metre |
| mile | mi | 1,609.344 metre |
| nautical mile | nmi | 1,852 metre |
FAQFrequently asked questions about length conversion
How many mm in a metre?
1,000.
What is 2,400 mm in metres?
2.4 m.
What is 900 mm?
0.9 m — a standard doorway width.
Why do drawings use mm?
Australian and UK construction drawings dimension in millimetres throughout, so every figure is a whole number on the same scale.
What is 6,000 mm?
6 m — a common steel and timber stock length.
Where these figures come from
- BIPM — The International System of Units (SI Brochure, 9th edition) — definitions of the base and derived units.
- NIST Special Publication 811 — Guide for the Use of the International System of Units — the exact conversion factors used here.
- National Physical Laboratory (NPL) — United Kingdom's national measurement authority.
Last checked: September 2026. Conversion factors are fixed by definition and do not change with tax years or regulations.