astronomical unit to kilometer Converter
Convert AU to km and back with a live reference table.
1 AU = 149598000 km\n5 AU = 747989000 km\n10 AU = 1495980000 km\n25 AU = 3739950000 km\n50 AU = 7479890000 km\n100 AU = 14959800000 km
Why this conversion matters
Astronomical units describe solar-system distances; kilometers are useful when you need the actual scale behind the shorthand. The widget keeps the direction explicit so you can enter either side of the pair without doing the reciprocal by hand. It is built for quick checks where a calculator, specification sheet, recipe, map, or lab note uses the other unit.
For the default example, 1 AU converts to 149598000 km. Switching the direction shows the inverse relationship, so 149598000 km converts back to 1 AU with the same factor.
Formula and privacy note
The calculation uses 1 AU = 149598000 km. Forward conversion multiplies by that factor, and reverse conversion divides by it. Results are rounded to six significant figures for readable estimates, so very small scientific units and large planning units stay scannable. Check the unit labels before copying a result, especially when similar abbreviations appear in the same project. The reference table is generated from the same constant, and everything runs locally in your browser.
Frequently Asked Questions
What factor does this converter use?
It uses the standard factor 1 AU = 149598000 km, then applies the reciprocal for the reverse direction.
Why are results rounded?
The main result is rounded to six significant figures so very large and very small values stay readable while preserving the useful precision for quick checks.
Can I convert both directions?
Yes. Choose AU to km or km to AU from the direction menu and the output updates immediately.
Is this converter private?
Yes. The conversion runs entirely in your browser, and the value you enter is not uploaded or stored.
Browse the full set of free, private, in-browser tools.