Unit Conversion TablesSI and customary units, exact factors where defined
Metre to customary
- 1 m
- 3.280840 ft
- 1 m
- 39.37008 in
- 1 m
- 1.093613 yd
- 1 km
- 0.6213712 mi
Customary to metre
- 1 in
- 25.4 mm exact
- 1 ft
- 0.3048 m exact
- 1 yd
- 0.9144 m exact
- 1 mi
- 1.609344 km exact
Nautical
- 1 nmi
- 1852 m exact
- 1 nmi
- 1.150779 mi
- 1 fathom
- 1.8288 m
- 1 cable
- 185.2 m
Small scale
- 1 mm
- 1000 µm
- 1 µm
- 1000 nm
- 1 Å
- 0.1 nm
- 1 mil
- 25.4 µm
Values marked exact are defined by the international yard and pound agreement of 1959. Others are rounded to seven significant figures.