BrowserTools

Length Converter

Meters, miles, feet, inches, km and more

By Guga — BrowserTools maintainer, Tbilisi, Georgia Updated 2026-09-21
Free Private No uploads
What is Length Converter?

Nine length units, each stored as its exact legal factor against the metre, which makes this one of the few converters where the arithmetic is genuinely lossless. An inch is 0.0254 m, a foot 0.3048 m, a yard 0.9144 m, a statute mile 1609.344 m and a nautical mile exactly 1852 m — all of them definitions rather than measurements, which is why a mile comes out as precisely 5280 feet. Type a number, choose the two units, and the tile grid underneath shows that length in every other unit at the same time, so you can sanity-check a figure against something you already know. Printed to eight decimal places, with scientific notation once a result leaves the range where decimal places are readable. There is no US survey foot, no thou, no furlong, and no chain here.

Convert lengths and distances between millimeters, centimeters, meters, kilometers, inches, feet, yards, miles and nautical miles — all updating in real time as you type.

Private Length Converter In Your Browser

Length Converter is processed locally with client-side JavaScript. Your files never touch a server, and there is no queue to wait in.

Step-by-Step

How to use Length Converter

1

Enter the measurement in the Value field.

2

Select the source measure from From unit — the nine options run from Millimeter up to Nautical mile.

3

Move to To unit and choose the measure you want; the arrow icon flips source and target in one click.

4

Scroll the All length units panel to see the same length expressed nine ways, and tap any tile to make it your target.

Key Capabilities
  • Nine units from millimetre to kilometre plus nautical mile
  • Every factor is the exact legal definition, including 1609.344 m to the statute mile
  • Simultaneous readout of the entered length in all nine units
  • A nautical mile held at its defining 1852 m rather than a rounded figure
Common Use Cases
  • A cyclist checking a route distance given in miles against the kilometre figure their bike computer shows.
  • A sailor converting a charted distance in nautical miles to kilometres, knowing the 1852 m convention is the one that matters.
  • A DIYer translating a furniture dimension from a US product page into millimetres for a European supplier.
Clear Answers

Frequently Asked Questions

Is a nautical mile the same as a mile?
No, and the gap is about 15%. A nautical mile is fixed by international agreement at exactly 1852 m, while a statute mile is 1609.344 m. One nautical mile therefore equals 1.15077945 statute miles, which is why air and sea distances run longer on the odometer than the chart says.
Why is 1 mile exactly 5280 feet?
Because the foot and the inch are exact too. The mile is defined as 5280 international feet of 0.3048 m each, and 5280 x 0.3048 comes to exactly 1609.344 m with nothing left over. That exactness is unusual — a converter built on rounded factors like 1.61 would not reproduce it.
Does this handle the older US survey foot?
No. It uses the international foot of 0.3048 m. The survey foot of 1200/3937 m differs by roughly 0.61 mm, which accumulates to about 8 metres across a mile. That matters only when reconciling property boundaries surveyed before the US adopted the international foot in 1866; for anything else the two are interchangeable.
How many cm are in an inch?
Exactly 2.54. Ten inches is 25.4 cm, and a 30 cm ruler runs about 11.8 inches. A centimetre is 0.3937008 inches, so a 12-inch foot comes to 30.48 cm precisely. Both figures follow from the legal definition of the inch, not from a rounded 2.5.

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