Length Converter

Length converter for meters, feet, inches, kilometers, and miles

This length converter helps you convert a measurement from one unit to another in a single step. It supports the most commonly used length units across both metric and imperial systems: metres, kilometres, centimetres, millimetres, inches, feet, yards, and miles. Whether you are working on a DIY project, planning a trip, checking a product spec, or doing school work, it gives you an instant conversion without needing to remember the conversion factors.

To use it, enter the value you want to convert, select the unit you are converting from, then choose the unit you want to convert to. The result updates as soon as you click Convert. Both the converted value and a short summary of the conversion are displayed so you can double-check you selected the right units.

The metric system is built on powers of ten, which makes conversions within it straightforward. One kilometre is exactly 1,000 metres, one metre is exactly 100 centimetres, and one centimetre is exactly 10 millimetres. Imperial conversions are less consistent — a foot is 12 inches, a yard is 3 feet, and a mile is 1,760 yards — which is why a calculator is genuinely helpful rather than optional.

Cross-system conversions (for example, metres to feet or kilometres to miles) are based on the internationally agreed exact definition: one inch is exactly 2.54 centimetres. Every other cross-system conversion in this calculator derives from that single fixed relationship. So one foot equals exactly 30.48 cm, one yard equals exactly 91.44 cm, and one mile equals exactly 1.60934 km. These are not approximations — they are fixed by international agreement and used in engineering, manufacturing, and legal measurement worldwide.

A common source of confusion is mixing up units that sound similar across systems. Metres and yards are both roughly "human scale" units — a metre is about 3.28 feet, and a yard is about 0.914 metres — but they are not the same. Kilometres and miles both measure road-scale distances, but a mile is about 1.609 kilometres, so a 10-mile trip is roughly 16 kilometres. Having a converter on hand makes these comparisons immediate rather than approximate.

Assumptions and how to use this calculator

• Enter numeric values only. Commas are accepted for readability (e.g. 1,250 is treated as 1250).
• The "From" and "To" units can be the same — the calculator will return your original value as-is.
• Negative values are accepted but most practical length measurements are positive.
• Rounding is applied to the displayed result for readability. Very small values may show more decimal places.
• Conversion basis: 1 inch = 2.54 cm (exact). All other conversions derive from this definition.

Common questions

How do I convert meters to feet?

Enter your value in the input box, select Metres (m) as the From unit and Feet (ft) as the To unit, then click Convert. One metre equals approximately 3.28084 feet, so if you enter 10 metres the result will be around 32.81 feet.

How many kilometres in a mile?

One mile equals exactly 1.609344 kilometres. So to convert a distance in miles to kilometres, multiply by 1.609344. For example, 5 miles equals about 8.05 kilometres. Select Miles (mi) as From and Kilometres (km) as To to let the calculator handle it.

Is an inch always exactly 2.54 cm?

Yes. Since 1959 the international inch has been defined as exactly 2.54 centimetres by agreement between the UK, USA, Canada, Australia, New Zealand, and South Africa. All metric-imperial conversions used here derive from this single definition.

Can I convert centimetres to kilometres?

Yes. Select Centimetres (cm) as From and Kilometres (km) as To. The underlying conversion is 1 km = 100,000 cm. This is useful in technical or scientific contexts where measurements start in small units but distances span large ones.

What is the difference between metres and yards?

Both are used for similar real-world distances, but they are not equal. One yard equals exactly 0.9144 metres, so a yard is slightly shorter than a metre. In practice, a 100-yard sprint is about 91.4 metres, and a 100-metre race is about 109 yards.