What is 40km in Miles?

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# What is 40 Kilometres (40km) in Miles (mi)?

What is 40km in mi? Convert 40 Kilometres (40km) to Miles (mi) and show formula, brief history on the units and quick maths for the conversion.

## Quick Reference for Converting Kilometres to Miles

Formula
mi = km / 1.61
Quick Rough Maths
To get the Miles, divide the number of Kilometres by 1.6
Kilometres (km) in 1 Mile
There are 1.61 Kilometres in 1 Mile
Miles (mi) in 1 Kilometre
There are 0.62 Miles in 1 Kilometre

## Unit Information

Kilometre
/ˈkɪləˌmiːtə,kɪˈlɒmɪtə/
Symbol: km
Unit System: SI

### What is the Kilometre?

The kilometre is a unit of length and is a multiple of the metre; an SI derived unit. It has the symbol km.

A kilometre is equal to 1000m, 1094 yards and 0.621 miles.

Kilometres is used to measure road distances in the US, though the UK is still using the imperial "sister" miles.

Mile
/mʌɪl/
Symbol: mi
Unit System: Imperial

### What is the Mile?

The mile is a unit of length in the imperial unit system with the symbol mi.

It was originally an English unit but was adopted by many countries who all had their own slight variation on definition. The English mile, however, is equal to 63,360 inches, 5280 ft or 1760 yards.

The UK still uses the mile on all roadway signs rather than the kilometre; its SI "equivalent". It used to have the symbol 'm' until SI was established and it was changed to avoid confusion with the unit metre.