astronomical unit to km

1 AU = 149,597,870.7 km (exact, IAU 2012), or 1.495978707×10¹¹ m — the mean Earth-Sun distance.

Conversion formula

1 AU = 149,597,870.7 km (exact, IAU 2012), or 1.495978707×10¹¹ m — the mean Earth-Sun distance.

Conversion table

1 au149598000 km
2 au299196000 km
3 au448794000 km
4 au598391000 km
5 au747989000 km
6 au897587000 km
7 au1047190000 km
8 au1196780000 km
9 au1346380000 km
10 au1495980000 km
15 au2243970000 km
20 au2991960000 km
25 au3739950000 km
50 au7479890000 km
100 au14959800000 km
1000 au149598000000 km

Reverse conversion table

1 km6.68459e-9 au
2 km1.33692e-8 au
3 km2.00538e-8 au
4 km2.67383e-8 au
5 km3.34229e-8 au
6 km4.01075e-8 au
7 km4.67921e-8 au
8 km5.34767e-8 au
9 km6.01613e-8 au
10 km6.68459e-8 au
15 km1.00269e-7 au
20 km1.33692e-7 au
25 km1.67115e-7 au
50 km3.34229e-7 au
100 km6.68459e-7 au
1000 km0.00000668459 au

Key facts

1 astronomical unit149,597,870.7 km (exact)
1 AU1.495978707×10¹¹ m
1 AU499.0 light-seconds (≈)
1 AU1.581×10⁻⁵ light-years (≈)

Frequently asked questions

How many km is 1 AU?

1 astronomical unit equals exactly 149,597,870.7 km, the mean distance from Earth to the Sun.

What is an astronomical unit used for?

The AU measures distances within the Solar System; it equals 149,597,870.7 km by IAU definition.

Reverse conversion

Printable A4 conversion cheat sheet — see the Downloads page

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