Astronomical Units to km
One astronomical unit is the mean Earth–Sun distance, defined as exactly 149,597,870.7 km. Mars sits at 1.5 AU, Jupiter at 5.2 and Neptune at 30.
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Common values
Formula
km = AU × 149597870.7
AU suits distances inside the solar system; light years take over between stars. One light year is about 63,241 AU.
Frequently asked questions
QHow many km is 1 AU?
1 AU is 149597870.7 km, and 10 AU is 1495978707 km. Type any value in the box above to convert instantly.
QAnd how many AU is 1 km?
1 km is 0 AU. This converter works both ways, so typing in the right box updates the left one.
QWhere is this unit used?
AU suits distances inside the solar system; light years take over between stars. One light year is about 63,241 AU.
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Traditional units (geun, doe, majigi and so on) vary by region and product.