Instantly convert between millimetres (mm), centimetres (cm), metres (m), kilometres (km), inches (in), feet (ft), yards (yd) and miles (mi). This free online length converter uses official international conversion factors to provide fast, accurate, and reliable results for everyday use, education, engineering, construction, travel, and science.
Supports instant conversions between both metric and imperial units with high precision.
Select the unit of the value you entered.
A Length Converter allows you to convert measurements between the world's most commonly used units of length and distance. It supports both the metric system (millimetres, centimetres, metres and kilometres) and the imperial system (inches, feet, yards and miles), making it ideal for everyday calculations and professional work.
Whether you're converting your height, measuring furniture, planning construction work, calculating travel distances or solving engineering problems, this converter provides instant and accurate results using official international conversion factors.
mm
cm
m
km
in
ft
yd
mi
A Length Converter allows you to quickly convert measurements between the most commonly used metric and imperial units. This calculator supports millimetres (mm), centimetres (cm), metres (m), kilometres (km), inches (in), feet (ft), yards (yd), and miles (mi), making it suitable for everything from everyday measurements to engineering and scientific calculations.
Whether you're measuring your height, converting construction plans, comparing international product dimensions, planning journeys, or completing school assignments, this converter provides instant and accurate results using internationally recognised conversion factors.
mm
cm
m
km
in
ft
yd
mi
The metric system is the international standard used in most countries and includes millimetres, centimetres, metres and kilometres. The imperial system uses inches, feet, yards and miles and remains common in the United States and is still widely used in the United Kingdom for height, road distances and construction.
This converter lets you switch between both systems instantly without needing to remember conversion formulas.
| Conversion | Value |
|---|---|
| 1 inch | 2.54 cm |
| 1 foot | 30.48 cm |
| 1 yard | 0.9144 m |
| 1 mile | 1.609344 km |
| 1 metre | 100 cm |
| 1 kilometre | 1,000 m |
| Metric | Imperial |
|---|---|
| 10 mm | 0.394 in |
| 100 mm | 3.94 in |
| 50 cm | 19.69 in |
| 100 cm | 3 ft 3.37 in |
| 170 cm | 5 ft 6.9 in |
| 180 cm | 5 ft 10.9 in |
| 1 km | 0.621 mi |
| 10 km | 6.214 mi |
Convert dimensions for building, DIY and renovation projects.
Measure products and engineering components accurately.
Convert road distances between kilometres and miles.
Perfect for maths, physics and engineering studies.
This calculator automatically uses internationally recognised conversion factors, ensuring accurate and consistent results every time.
How many centimetres are in an inch?
One inch equals exactly 2.54 centimetres.
How many feet are in a metre?
One metre equals approximately 3.28084 feet.
How many kilometres are in a mile?
One mile equals exactly 1.609344 kilometres.
Can I convert height measurements?
Yes. The converter is ideal for converting between centimetres, feet and inches.
Are these conversions accurate?
Yes. The calculator uses official international conversion standards for all supported units.
If you regularly convert measurements, you may also find our Weight Converter (kg ⇄ lbs ⇄ st), Speed Converter (mph ⇄ km/h), Temperature Converter (°C ⇄ °F), Volume Converter (L ⇄ UK/US Gallons), Mileage Calculator and Scientific Calculator useful.
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Last Updated: August 2026
Quickly calculate percentages and changes.
Simple calculator for everyday math.
Calculate sale prices and savings instantly.
Split bills and calculate tips easily.
Simplify and scale ratios instantly.
Calculate mean, median and mode instantly.
Quickly access our most popular calculators. Fast, accurate, and free — no signup required.
Browse essential calculators for finance, everyday maths, and scientific calculations — all in one place.
✔ Free • ✔ Fast • ✔ No signup required • ✔ No DATA collected
Built for personal use, now shared for free — simple, fast, and private calculators for everyone.
Last Updated: August 2026