Length converter
The metric system measures length in metres. Imperial units — inches, feet, yards and miles — are defined exactly in metres (1 inch = 2.54 cm). Traditional Thai units such as the wa, sok and khuep are also fixed in metres (1 wa = 2 m).
Common conversions
1 millimetre equals
| centimetre (cm) | 0.1 |
|---|---|
| decimetre (dm) | 0.01 |
| metre (m) | 0.001 |
| kilometre (km) | 0.000001 |
| micrometre (µm) | 1,000 |
| nanometre (nm) | 1,000,000 |
| inch (in) | 0.0393701 |
| foot (ft) | 0.00328084 |
| yard (yd) | 0.00109361 |
| mile (mi) | 6.21371 × 10^-7 |
| nautical mile (NM) | 5.39957 × 10^-7 |
| wa (Thai) (wa) | 0.0005 |
| sok (Thai) (sok) | 0.002 |
| khuep (Thai) (khuep) | 0.004 |
| sen (Thai) (sen) | 0.000025 |
| yot (Thai) (yot) | 6.25 × 10^-8 |
| light-year (ly) | 1.057 × 10^-19 |
Every Length conversion
millimetre (mm)
centimetre (cm)
metre (m)
kilometre (km)
inch (in)
foot (ft)
yard (yd)
mile (mi)
nautical mile (NM)
wa (Thai) (wa)
sok (Thai) (sok)
khuep (Thai) (khuep)
About Length units
- centimetre (cm)
- One hundredth of a metre, used for heights and everyday objects.
- metre (m)
- The SI base unit of length.
- kilometre (km)
- 1,000 metres, used for road distances.
- inch (in)
- Exactly 2.54 cm. Used for screen sizes, waistlines and pipes.
- foot (ft)
- 12 inches or 30.48 cm, used for height and room sizes.
- yard (yd)
- 3 feet or 0.9144 m.
- mile (mi)
- 5,280 feet or 1.609344 km, used for road distances in the US and UK.
- nautical mile (NM)
- 1,852 m, used at sea and in aviation.
- wa (Thai) (wa)
- Thai unit: 1 wa = 4 sok = 2 m.
- sok (Thai) (sok)
- Thai unit: 1 sok = 2 khuep = 50 cm.
- khuep (Thai) (khuep)
- Thai unit: 1 khuep = 25 cm.
- sen (Thai) (sen)
- Thai unit: 1 sen = 20 wa = 40 m.
- yot (Thai) (yot)
- Old Thai unit: 1 yot = 400 sen = 16 km.
- light-year (ly)
- The distance light travels in a year.
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