Welcome to our Length Converters page, your one-stop collection of free online tools for converting between the most common length and distance units. Length conversions come up everywhere in daily life: reading product dimensions on an overseas shop, checking your height in feet and inches, measuring a plot of land in metres, or converting running distances between kilometres and miles. Our tools handle the maths for you using the official international conversion factors, and show your result the moment you type. There is no sign-up, no software to install and no charge – each converter works straight in your browser on any device.
The two systems most people need to move between are metric and imperial. Metric units such as millimetres, centimetres, metres and kilometres are used in most of the world and in science, while imperial units such as inches, feet, yards and miles remain common in the United States, the United Kingdom and a few other countries. Mixing the systems up can cause costly mistakes, so it pays to convert properly rather than guess. Choose the converter below that matches the units you are starting from, enter your value, and take the accurate result.
Our Length Converters
- Universal Length Converter – the all-in-one tool for converting between many length units on a single page.
- Inch to Millimetre Converter – ideal for DIY projects, engineering drawings and product specifications.
- Inch to Kilometre Converter – turn inch measurements into kilometres instantly.
- Kilometre to Metre Converter – move quickly between two of the most widely used metric length units.
How to Use These Converters
Using any of our length converters is straightforward. Open the tool that fits your units, type the number you want to convert, and your answer appears immediately. All four tools accept decimal values, so you can convert precise measurements such as 2.75 inches or 1.609 kilometres. Results are rounded sensibly to keep them readable while remaining accurate enough for school projects, work calculations and everyday decisions. If you need a different pairing of units, the Universal Length Converter covers the widest range of options in one place.
Frequently Asked Questions
How do I convert inches to millimetres?
Multiply the number of inches by 25.4. One inch is exactly 25.4 millimetres. Our Inch to Millimetre Converter does this for you instantly.
How many metres are in a kilometre?
There are exactly 1,000 metres in a kilometre. Our Kilometre to Metre Converter multiplies any kilometre value by 1,000 straight away.
Can I convert decimal measurements?
Yes. All of our length converters accept decimal values, so measurements such as 5.5 inches or 2.25 kilometres are no problem.
Are these length converters free?
Yes, every converter on this page is completely free to use, with no registration, no limits and no software to download.
Will the converters work on my phone?
Yes. The tools are responsive and work in any modern mobile browser, so you can convert measurements wherever you are.