Length & Distance Converter

Worked example

1 km ≈ 0.6213711922 mi, because 1 mile is exactly 1.609344 km. 1000 m = 1 km exactly.

How it works

Numerila converts through the metre using exact internationally defined constants: the inch is exactly 0.0254 m, a foot is 12 inches, a yard is 3 feet, a mile is 5,280 feet (1,609.344 m) and the nautical mile is exactly 1,852 m. The international foot is used throughout, not the US survey foot. A negative input is converted mathematically in the same way as a positive one, rather than being rejected. That is useful for a signed measurement such as a displacement, a coordinate difference or a directional offset, rather than a literal negative physical distance.

A result written as a plain number is exact. A result starting with “≈” has been rounded to 10 significant figures, because its exact decimal never ends or is too long to read comfortably. When an exact value is long, its full digits are shown underneath. The calculation itself is never rounded: only the display is.