Type one length and see it in all nine units at once, with a feet and inches box that turns a height into centimetres and metres.
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This length converter takes one value and shows it in nine units at the same time: millimetres, centimetres, metres, kilometres, inches, feet, yards, miles and nautical miles. Type a length once, pick the unit it is in, and every other unit fills in beside it, so you never convert the same number twice.
One value in, nine lengths out.
The metric side runs from millimetres for small parts and print work, through centimetres and metres for everyday measuring, up to kilometres for road distances. The imperial side covers inches, feet and yards, then miles for the long hauls.
Nautical miles sit in the list for sailors, pilots and map readers. One nautical mile is 1,852 metres, and it ties to the geometry of the Earth rather than to a ruler, which is why it never matches the road mile.
Yards deserve a word of their own, since they confuse people raised on metric. A yard is three feet, a touch shorter than a metre, and it still runs football fields, fabric counters and building plots in several countries. If a plan quotes yards and your tape reads metres, the two are close enough to look interchangeable and far enough apart to wreck a cut.
Heights get their own entry because people rarely state a height as a single number. A person is 5 feet 10 inches, not 70 inches, and typing the two parts separately removes the mental maths where mistakes creep in. That height works out to 70 inches, which is 177.8 centimetres.
Every factor here is an exact international definition, not a rounded shortcut, and an inch is 2.54 centimetres exactly, by agreement, not by measurement. A foot is 0.3048 metres, a yard is 0.9144 metres, and a mile is 1,609.344 metres, all fixed the same way.
Because the factors are exact, converting there and back returns your starting number. Rounded factors drift a little on every hop, and the drift grows on long distances, so a mile figure built on a rounded inch can land metres away from the truth.
One caution: this tool converts the unit, not the thing being measured. A screen sold as 55 inches is measured corner to corner, and a room measured in feet still needs its own tape work before any converter helps.
The tool runs in your browser alone. Your measurements are never uploaded or stored, you need no account, and there is no limit on how often you convert.
Exactly 2.54. The inch is defined as 2.54 centimetres by international agreement, so conversions built on it never drift.
Use the feet and inches entry. Type 5 in the feet box and 10 in the inches box, and the tool combines them into one height: 70 inches, or 177.8 centimetres, or 1.778 metres.
One nautical mile is 1,852 metres exactly, about 1.151 road miles. It belongs to navigation, where it matches one minute of latitude.
Because the unit you need is often not the first one you think of. A manual may want millimetres, a form may want centimetres, and a friend may think in feet, all from the same measurement.
From fractions of a millimetre up to thousands of miles. The factors are exact at any size, so a long distance converts as cleanly as a short one.
No. Everything happens on your device, in the browser, and nothing you type is uploaded, saved or shared anywhere.
Same rules as this one: free, in your browser, with nothing uploaded.
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