 Convert Kilometres (km) to Astronomical Units (AU) | km in AU
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# Let's convert Kilometres (km) to Astronomical Units (AU)

This quick and easy calculator will convert Kilometres (km) to Astronomical Units (AU) and show formula, brief history on the units and quick maths for the conversion.

## Quick Reference for Converting Kilometres to Astronomical Units

Formula
AU = km / 149598000
Quick Rough Maths
To get the Astronomical Units, divide the number of Kilometres by 149.6 million
Kilometres (km) in 1 Astronomical Unit
There are 149598000 Kilometres in 1 Astronomical Unit
Astronomical Units (AU) in 1 Kilometre
There are 0 Astronomical Units 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.

Astronomical Unit
/astrəˈnɒmɪk(ə)l ˈjuːnɪt/
Symbol: AU
Unit System: Astronomical system of units

### What is the Astronomical Unit?

The astronomical unit is a unit of length and is used in the Astronomical system of units and denoted by the symbol au.

It represents the average distance between the Earth and the Sun which is approximately 150 million kilometres (or 93 million miles).

It's used mostly to express distances within our Solar System.