Add the numbers for your scenario.
01Everyday toolCalculated result
Length Converter
Convert miles, km, feet, inches, metres and more.
100% FreeRuns instantlyNo watermark
- 1Enter detailsAdd the numbers for your scenario.
- 2CalculateVootkit updates the result instantly.
- 3ReviewCheck totals, notes and breakdowns.
Private by designProcessed on your device where possible.
Works on any deviceDesktop, tablet and mobile browsers.
No installationOpen the page and start working.
Always free coreUse the free plan for everyday tasks.
How to use Length Converter
Vootkit updates the result instantly.
02Check totals, notes and breakdowns.
03Copy the answer into your workflow.
04Your files stay private
Your work is processed locally in your browser where possible and is never added to a Vootkit upload library.
Learn more about privacyLength is the conversion people get almost right and then get wrong by a fraction — because the factors everyone remembers are rounded, and rounding compounds. An inch is not about 2.5 cm; it is exactly 25.4 mm, by international agreement since 1959.
What Length Converter does
Converts between metric, imperial and nautical units using the exact defined factors rather than the approximations. A mile is exactly 1609.344 m, a yard exactly 0.9144 m, a foot exactly 0.3048 m.
Includes nautical miles at exactly 1852 m — a different unit from the statute mile, defined as one minute of latitude, and the reason aviation and shipping speeds are quoted in knots rather than mph.
Exact factors, in metres
| Kilometre | 1000 |
|---|---|
| Mile | 1609.344 — exact by definition |
| Nautical mile | 1852 — exact, one minute of latitude |
| Yard | 0.9144 — exact |
| Foot | 0.3048 — exact |
| Inch | 0.0254 — exactly 25.4 mm |
| Centimetre / millimetre | 0.01 / 0.001 |
| Default conversion | Miles → kilometres |
Detailed steps
- Enter the value.
- Pick the unit you have and the unit you want.
- Read the result — all other units are shown alongside.
Worth knowing
A nautical mile is not a mile. At 1852 m it is about 15% longer than the statute mile, which is why a boat doing 20 knots is moving at roughly 23 mph. Converting the two as though they were the same is a common and occasionally expensive error in navigation and shipping paperwork.
Frequently Asked Questions
Is an inch exactly 2.54 cm?
Yes, exactly — since the 1959 international yard and pound agreement, which defined the inch as precisely 25.4 mm. Before that the US and UK inches differed very slightly, which caused real problems in engineering.
What is a nautical mile for?
It equals one minute of latitude, so it maps directly onto a chart — 60 nautical miles is one degree of latitude. That makes navigation arithmetic trivial, which is why marine and aviation distances use it and speeds are given in knots.
Why not just multiply by 1.6 for miles?
For rough mental arithmetic it is fine. Over a marathon it is out by about 150 m, and in anything engineering or legal the rounding is not acceptable — the exact factor is 1.609344.
Which units are metric here?
Metre, kilometre, centimetre and millimetre. Mile, yard, foot and inch are imperial/US customary, and the nautical mile belongs to neither system.
Is Length Converter free?
Yes. The Vootkit free plan includes 5 tool runs a day. Upgrade to Vootkit Pro for unlimited daily use, an ad-free workspace and saved workflows.
Are my files uploaded?
No. Length Converter runs entirely in your browser — your file is processed on your own device and never sent to a server. There is nothing for us to store or delete.
Do I need to install anything?
No. Length Converter works in any modern browser on desktop, tablet or phone. Open the page and start.
How often can I use it? Is there a daily limit?
On the free plan you get 5 tool runs a day. When you reach the limit you'll see a prompt to upgrade, and it resets the next day. Vootkit Pro removes the cap entirely for unlimited daily use.
Recently viewed
This tool processes everything locally in your browser. You can disconnect from the internet after the page loads and it will still work.