Convert lengths locally between metric and imperial units like metre, kilometre, mile, foot and inch. No upload, in your browser.
No. Everything runs in your browser - your file never leaves your device. How this is verifiable
Lengths are measured in two large systems: the metric one (metre, kilometre, centimetre, millimetre) and the Anglo-American one (mile, yard, foot, inch). When reading building plans, travel distances, screen sizes or American instructions you constantly switch between them. This converter takes a value in one unit and gives it exactly in another.
The conversion rests on fixed, internationally agreed definitions: one inch is exactly 2.54 centimetres, one foot exactly 0.3048 metres, one mile exactly 1609.344 metres (the 1959 agreement). Internally your value passes through the base unit metre - first from the source unit into metres, then from metres into the target unit. So any combination is possible and the result is exact up to the displayed rounding.
The whole calculation runs entirely locally in your browser, in pure JavaScript - nothing is uploaded and nothing is stored. Choose the source and target unit, enter a value, and the result updates instantly. The display rounds to six decimals; very small or very large ratios may therefore appear rounded.
| Input formats | Form inputs (no file) |
|---|---|
| Processing | Locally in your browser (JavaScript) |
| File upload | None |
Limitations: Converts lengths between metre, kilometre, centimetre, millimetre, mile, yard, foot and inch, using fixed international definitions (1 inch = 2.54 cm, 1 mile = 1609.344 m). The display rounds to six decimals.
No. The conversion runs entirely locally in the browser (pure JavaScript); your input never leaves your device and is not stored.
Exactly 2.54 centimetres. This definition has been fixed internationally since 1959, so the conversion is exact.
The statute mile of exactly 1609.344 metres. The nautical mile (1852 metres) is a different unit and is not included.
The display rounds to six decimals. Internally the calculation uses full precision; only the presentation is shortened.