How to use the Length Converter
- 1 Type the value you want to convert. Decimals are fine.
- 2 Choose the unit you are converting from, such as feet.
- 3 Choose the unit you want to see, such as centimetres. The answer appears straight away.
- 4 Check the table below for the same length in every other unit, or press the swap button to reverse the conversion.
Features
Exact factors
Conversions use the international definitions: 1 inch is exactly 2.54 cm, 1 foot is 0.3048 m, 1 yard is 0.9144 m and 1 mile is 1,609.344 m.
All units at once
The table shows your value in ten units, including micrometres and nautical miles, so you do not have to convert twice.
Clean results
Answers are shown to sensible precision without long strings of digits, and very small values switch to scientific notation.
When to use it
Height and body measurements
Convert a height of 5 feet 7 inches by entering 5.58 feet, or enter 170 cm and read the result in feet.
Furniture, rooms and plots
Check whether a 2.4 metre sofa fits an 8 foot wall, or convert room sizes from a builder's plan.
Travel and sport
Turn kilometres on a map into miles, or a 10k race into miles before you train.
Construction and DIY
Builders' plans, tile sizes and pipe lengths often mix units. Convert millimetres from a drawing into inches for a measuring tape, or feet from a supplier's list into metres for your order.
Frequently asked questions
How many centimetres are in an inch?
Exactly 2.54 centimetres. This has been the international definition since 1959.
How do I convert feet and inches together?
Convert the inches to a fraction of a foot first: divide by 12 and add it to the feet. 5 feet 6 inches is 5.5 feet, which is 167.64 cm.
What is the difference between a mile and a nautical mile?
A mile is 1,609.344 metres. A nautical mile, used at sea and in aviation, is 1,852 metres, based on one minute of latitude.
How many feet are in a metre?
One metre is about 3.2808 feet, because one foot is exactly 0.3048 metres.
Is this converter accurate enough for engineering?
The factors are exact; results are rounded for display to about ten significant figures, which is more precision than most measuring tools provide.
How many kilometres are in a mile?
One mile is exactly 1.609344 kilometres, so 5 miles is about 8.05 km and a 10 km race is about 6.21 miles. To estimate in your head, multiply miles by 1.6.
Reviewed by ToolsUnlocked Team · Last updated