Length Converter
Convert length units in seconds, from nanometres and micrometres to millimetres, centimetres, metres, plus inches, feet, and yards fast.
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SIMILAR TOOLS
What this converter does
A tape measure marked in centimetres, a manual that lists inches, a screw sized in millimetres: lengths arrive in two systems that rarely line up. This tool moves a measurement between them, covering metres down to nanometres alongside the imperial inch, foot, and yard, so it fits anything from a bookshelf to a microchip feature.
How to use it
- Type your length into the value box.
- Set From to the unit you have, and To to the unit you want. It opens on metres to centimetres.
- Press Calculate.
The result reads back in plain words, like "30 cm is equal to 0.984252 ft." Use Swap to flip the two units, and Reset to clear.
How it works
Internally, every unit is pinned to the metre. The tool converts your figure to metres first, then out to the unit you asked for, using the standard factors, like the inch defined as 2.54 centimetres and the yard as 0.9144 metres. Displayed results are rounded to nine significant figures.
Common length conversions
A few you are likely to reach for:
| Conversion | Value |
|---|---|
| 1 inch | 2.54 cm (25.4 mm) |
| 1 foot | 30.48 cm (12 inches) |
| 1 yard | 0.9144 m (3 feet) |
| 1 metre | 100 cm, about 39.37 inches |
| 1 centimetre | 10 mm, about 0.39 inch |
| 1 millimetre | 1,000 micrometres (µm) |
Length or Distance: which one you need
You may have noticed there is no kilometre or mile here, and that is deliberate. This tool is built for the size of a thing: how tall, how wide, how long an object or a material is, where metres, centimetres, and inches do the work.
The moment you are measuring how far apart two things are, a journey, a route, the gap between towns, you want kilometres or miles, and those live in the Distance Converter. Same underlying maths, but it stretches up to the units travel actually uses. So: Length for the size of something, Distance for how far away it is.
Questions people ask
How many centimetres are in an inch?
Exactly 2.54 centimetres, or 25.4 millimetres. It is a defined value, not a rounded one.
How do I convert feet to metres?
Multiply the number of feet by 0.3048. One foot is 30.48 centimetres, so 6 feet is about 1.83 metres.
What is the difference between the Length and Distance converters?
Length covers object-scale units, from nanometres up to yards, with no kilometre or mile. Distance adds kilometres and miles for measuring how far apart things are. Use Distance for journeys and geography.
How many millimetres are in a centimetre?
Ten. A centimetre is 10 millimetres, and a metre is 100 centimetres or 1,000 millimetres.
Is an inch exactly 2.54 cm?
Yes. Since the international agreement of 1959, the inch has been defined as exactly 2.54 centimetres, which makes inch-to-metric conversions precise.
References
- National Institute of Standards and Technology (NIST), Office of Weights and Measures. The International System of Units (SI) and unit definitions. https://www.nist.gov/pml/owm/metric-si/si-units
Okan Atalay is a results driven senior operations manager and a graduate of Industrial Engineering from Bilkent University. With over 22 years of experience in textile manufacturing and integrated operations, he has led large scale business process improvements and strategic planning initiatives. Currently, he serves as a top mathematics expert for a global ed tech platform, where he applies his analytical expertise to solve complex mathematical problems. At Eon Tools, he reviews converter and maths tools.