Length Converter●
From picometres to nautical miles. Convert metric, imperial and technical lengths in one place.
Length
Use a decimal point (2.54), scientific notation (1e3), or feet + inches (5 ft 11 in).
Feet + inches detected. The source unit is set to feet. Swap converts the value to the other unit.
Fractional results are rounded to the nearest 1/16 inch.
Length conversions
Choose a conversionAll equivalent units
The same value, in every supported unit.
Everyday lengths. Clearly measured.
Use metres and feet for heights, or kilometres and miles for distances. You can also enter feet and inches together, such as 5 ft 11 in, and choose fractional inches in Precision.
- 1 in
- 2.54 cm
- 1 ft
- 12 in
- 1 nmi
- 1,852 m
Calculation details & precision
Length conversions use metres as the base unit. The international inch is exactly 0.0254 m; a foot is 12 inches, an international mile is 1,609.344 m, and an international nautical mile is 1,852 m.
Automatic displays up to 12 significant digits. Choose 2, 4 or 6 decimal places in Precision for a shorter result. Displayed results are rounded; very large or small values use scientific notation.
Common questions
How many centimetres are in an inch?
One international inch is exactly 2.54 centimetres. To convert centimetres to inches, divide by 2.54.
Which foot and mile are used?
The international foot is exactly 0.3048 metres. The international mile is 1,609.344 metres. Historical survey units are not included.
How is a nautical mile different from a mile?
One international nautical mile is exactly 1,852 metres. An international mile is exactly 1,609.344 metres. Choose “Nautical miles (nmi)” for nautical distances; “Nanometres (nm)” is a very small metric unit.
What does thou / mil mean here?
Thou and mil both mean one thousandth of an inch (0.001 in), or exactly 0.0254 mm. Here mil is a length unit, not the angular unit used in some other contexts.