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About this tool
Convert astronomical units to kilometers instantly. Free, bidirectional, and fully in-browser.
1 astronomical unit equals 149597870.7 kilometers — enter any astronomical unit value to convert it to kilometers instantly. This Astronomical unit to Kilometer converter is a client-side tool: it applies a single multiplication (km = AU × 149597870.7) in your browser, updates the moment you type, and works in both directions — edit either field, or press swap, to convert kilometers back to astronomical units. A reference table lists common astronomical unit values already converted, and nothing you enter is sent to a server.
Open Astronomical unit to Kilometer Converter on AltFTool — it loads instantly in your browser.
Type the value you want to convert into the Astronomical unit field.
Read the equivalent in kilometers in the result field, and copy it if needed.
Use the decimal-places slider for more or less precision, or press swap to convert kilometers to astronomical units.
The result updates as you type, and the swap button flips the conversion to kilometer → astronomical unit without reloading.
The conversion uses the precise factor (km = AU × 149597870.7), so the number matches a manual calculation to the decimal places you choose.
A slider sets 0–10 decimal places, and very small or very large results switch to scientific notation instead of rounding to zero.
Everything runs locally in your browser — no upload, no account, no limit on conversions.
One astronomical unit is 149597870.7 kilometers. Multiply the astronomical unit value by 149597870.7 to convert. For example, 10 AU = 1495978707 km.
km = AU × 149597870.7. This tool applies it automatically and shows a worked example: 10 AU = 1495978707 km.
Yes. Press the swap button, or type into the kilometer field, and the tool converts kilometers to astronomical units using the inverse of the same relationship.
It uses the standard distance and length definition (km = AU × 149597870.7), not a rounded approximation, so results are exact to the number of decimal places you select.
Yes. The converter is a browser-side script with no network calls: your values are never uploaded, and once the page has loaded it keeps working without a connection.
Add the Astronomical unit to Kilometer Converter widget to your blog or website — free, responsive, no signup. Just keep the “Widget by AltFTool” credit link visible.
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