What is a Length Converter?
> Length Converter turns any distance between metric and imperial units — centimetres, metres, kilometres, inches, feet, yards, miles, and nautical miles. Enter a value, pick your units, and read the result with the exact factor shown (1 inch = 2.54 cm exactly). It runs in your browser and works offline. ---
### H2: Convert length between metric and imperial — with the math shown
Length conversions come up constantly and rarely at a convenient moment: a furniture listing gives dimensions in inches when your room is measured in centimetres, a running route is in kilometres but your treadmill shows miles, or a school worksheet asks how many millimetres are in a metre. Most of the time you just want the number — and you want to trust it.
This converter handles the nine units people actually use: metre, centimetre, millimetre, and kilometre on the metric side, and inch, foot, yard, mile, and nautical mile on the imperial and marine side. Type a value, choose what you're converting *from* and *to*, and the answer appears instantly. A swap button flips the direction, and the all-units table expands a single value into every unit at once, so "1 metre" becomes 100 cm, 1000 mm, 3.28084 ft, and 39.3701 in on one screen.
What sets this tool apart is that it shows the exact conversion factor behind each result. An inch is 2.54 centimetres by international definition — not an approximation — and the tool states that relationship so you can verify the answer instead of trusting a black box. The same goes for a mile (1609.344 m exactly) and a nautical mile (1852 m exactly).
Everything runs on your own device. The math uses fixed, defined conversion factors, so there's nothing to upload, no account to create, and no internet connection required once the page has loaded — handy on a plane, in a workshop, or anywhere with patchy signal. Values are rounded only for display; the exact figure is always available if you need more decimal places.
---
