Length Converter
Metric and imperial lengths, from millimetres to miles and nautical miles. The inch has been defined as exactly 2.54 cm since the 1959 international yard and pound agreement.
0.3937007874 in
1 cm = 0.3937007874 in
1 centimetre in every length unit
millimetre10 mm
metre0.01 m
kilometre0.00001 km
inch0.39370079 in
foot0.032808399 ft
yard0.010936133 yd
mile0.0000062137 mi
nautical mile0.0000053996 nmi
micrometre10,000 µm
centimetre to inch table
| centimetre (cm) | inch (in) |
|---|---|
| 1 | 0.39370079 |
| 2 | 0.78740157 |
| 5 | 1.9685039 |
| 10 | 3.9370079 |
| 20 | 7.8740157 |
| 50 | 19.685039 |
| 100 | 39.370079 |
| 250 | 98.425197 |
| 500 | 196.85039 |
| 1,000 | 393.70079 |
Units and factors
| Unit | Symbol | In metres |
|---|---|---|
| millimetre | mm | 0.001 |
| centimetre | cm | 0.01 |
| metre | m | 1 |
| kilometre | km | 1,000 |
| inch | in | 0.0254 |
| foot | ft | 0.3048 |
| yard | yd | 0.9144 |
| mile | mi | 1,609.344 |
| nautical mile | nmi | 1,852 |
| micrometre | µm | 0.000001 |
Single conversions
Questions people ask
How do I convert centimetres to inchs?
Multiply by 0.3937007874. For example 10 cm = 3.9370079 in.
What is the base unit for length?
The converter uses the metre as its internal base. Every unit is converted to metres and then to the target unit, so any pair of units works.
Where do the conversion factors come from?
From the legal definitions published in NIST Special Publication 811 and the SI Brochure (BIPM). Where a unit is defined exactly, the factor is exact.