What does the Length Converter work out?

Convert metres, feet, miles, inches and more at once. It is one of the Unit Converters tools on Mondo Knows.

Do I need to sign up, and is my data stored?

No sign-up, and nothing you type is sent anywhere. The calculation runs in your own browser, so the figures stay on your device and the page works offline once loaded.

Mondo Knows Tools

Length Converter

Convert metres, feet, miles, inches and more at once. Use the free length converter below to get an instant answer, with the formula shown so you can check the maths and trust the result. Free, private, and no sign-up.

Value

Unit you have

Unit for the big answer

Mondo says

1 m =

3.28084

Nanometre (nm)1,000,000,000

Micrometre (µm)1,000,000

Millimetre (mm)1,000

Centimetre (cm)100

Metre (m)1

Kilometre (km)0.001

Inch (in)39.3701

Foot (ft)3.28084

Yard (yd)1.09361

Mile (mi)0.000621371

Nautical mile (nmi)0.000539957

Fathom (ftm)0.546807

Rod (rd)0.198839

Furlong (fur)0.00497097

Astronomical unit (AU)6.6846e-12

Light year (ly)1.0570e-16

16 units. The bold row is the unit you picked for the big answer.

How it works

One measurement, every unit of length at the same time: metric on one side, imperial on the other, and the nautical and astronomical units that turn up in odd places. Useful when a spec sheet gives you one figure and a plan needs another.

The formula

Every unit is defined by how many base units it is worth, so the conversion is value x factor(from) / factor(to).

Length Converter: common questions

What does the Length Converter work out?: Convert metres, feet, miles, inches and more at once. It is one of the Unit Converters tools on Mondo Knows.
How is the Length Converter calculated?: One measurement, every unit of length at the same time: metric on one side, imperial on the other, and the nautical and astronomical units that turn up in odd places. Useful when a spec sheet gives you one figure and a plan needs another. The maths is short enough to check by hand: Every unit is defined by how many base units it is worth, so the conversion is value x factor(from) / factor(to).
Do I need to sign up, and is my data stored?: No sign-up, and nothing you type is sent anywhere. The calculation runs in your own browser, so the figures stay on your device and the page works offline once loaded.

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Estimates for general guidance only. This is not financial, medical or legal advice. Everything runs in your browser and nothing you type is stored.