Convert between metric, imperial, and nautical units instantly.
Result
3.28084ft
1 Metre in all units
Millimetre1,000
Centimetre100
Metre1
Kilometre0.001
Inch39.370079
Foot3.28084
Yard1.093613
Mile0.000621
Nautical mile0.00054
Conversions are calculated using standard metric and imperial definitions.
The Length Converter transforms measurements between 20+ units—metres, feet, inches, kilometres, miles, yards, and more—in real time. Whether you're sizing furniture, planning construction, or working across measurement systems, this tool handles imperial, metric, and specialized units all in one place.
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What is the Length Converter?
A length converter is a tool that translates distance or dimension measurements between different units without requiring manual calculation. It works across metric (millimetre to kilometre), imperial (inch to mile), nautical, and specialty units, letting you switch systems instantly. Users paste a number and unit, select a target unit, and get the converted value in seconds.
How it works
The converter stores exact conversion factors for each unit pair. When you enter a length value and choose a source unit, the tool divides by that unit's base factor, then multiplies by the target unit's factor—translating both to a common reference (usually metres) in between. All conversions happen client-side, so results appear instantly without uploading data or waiting for a server.
Examples
Input
Result
Notes
5 miles
8.047 kilometres
Common for runners and drivers comparing road distances across regions
180 centimetres
5 feet 11 inches
Height conversions when shopping for clothes or medical records across countries
1200 metres
3937 feet
Construction and surveying where site plans use different unit conventions
How to use the Length Converter
Enter the length value you want to convert (e.g., 10, 2.5, or 100)
Select the current unit from the dropdown menu (metres, feet, miles, etc.)
Choose the target unit you need to convert to
View the result instantly—no buttons or refreshes needed
Copy the converted value or enter a new measurement to continue
Benefits
Covers 20+ units across metric, imperial, and nautical systems in one tool
Instant live conversion as you type—no waiting, no clicking
Works offline in your browser; no data upload or account required
Handles decimals and large numbers; no limits on input size
Mobile-friendly interface works on phones, tablets, and desktops
Tips & common mistakes
Common mistakes
Confusing feet with foot marks; 5 feet (height) ≠ 5 feet per second (speed)
Forgetting to check decimal places—0.5 km is NOT the same as 5 km
Mixing imperial and metric without converting both (e.g., adding 10 feet to 5 metres directly)
Assuming online converters store your data; most (including this one) do not
Tips
Bookmark this tool for recurring work—DIY projects, travel planning, or professional measurement
If comparing very large or very small lengths, use scientific notation (1e6 for 1 million) to avoid typos
Many converters round decimals; for precision work (engineering, surveying), note how many decimal places are shown
Nautical mile conversions are useful for aviation and maritime navigation; distinguish them from statute miles in road travel
Frequently asked questions
What's the difference between a metre and a yard?
A metre is 1.094 yards or 39.37 inches. The metre is the SI unit of length; yards are imperial. A metre is slightly longer—roughly a 10% difference.
How many feet are in a kilometre?
1 kilometre = 3,281 feet. A kilometre is a thousand metres; each metre is about 3.28 feet, so multiply by 1,000 to get the full conversion.
Why do I need a length converter when I can calculate it myself?
Manual calculations risk arithmetic errors, especially with awkward ratios (1 inch = 2.54 cm). A tool prevents mistakes and saves time when you convert frequently or work across unit systems daily.
Can I convert between metric and imperial in real time?
Yes—that's the main point of a length converter. Pick any metric unit (millimetre, centimetre, metre, kilometre) as the source and any imperial unit (inch, foot, yard, mile) as the target, and the conversion happens instantly.
Is a nautical mile the same as a regular mile?
No. A nautical mile is 1.852 kilometres or 1.151 statute miles. It's based on Earth's circumference and used in shipping and aviation; road distances use statute miles.
Does this converter work offline?
Yes, the converter runs in your browser and requires no internet connection after the initial page load. All conversions happen locally on your device.