Unit Conversions & Measures
Astronomical Units to Kilometers Converter
Convert astronomical units to kilometers with the exact factor, the working shown step by step and a plain-English explanation.
Your inputs
Change any value to update the result instantly.
Kilometers
149,597,870 km
Conversion factor
1 au = 149,597,870.7 km
Value in meter (internal base unit)
149,597,870,000 m
Reverse conversion check
149,597,870 km = 1 au
Rounded for everyday use
149,600,000 km
What this calculator does
Converts a measurement given in astronomical units into kilometres using the defined conversion factor.
What your result means
The same quantity expressed in km instead of au. Nothing about the measurement itself changes.
Formula and working
km = au × 149,597,870.7
- 1
Start with your value
1 au
- 2
Convert to meter
1 × 149,597,870,700 = 149,597,870,000 m
- 3
Convert into kilometers
149,597,870,000 ÷ 1,000 = 149,597,870 km
- 4
Result
1 au = 149,597,870 km
Frequently asked questions
Symbols and assumptions
- au
- Input unit — astronomical unit
- km
- Output unit — kilometre
- m
- Base unit used internally for length and distance
- • Both units measure length and distance, so the physical quantity is unchanged by the conversion.
- • The relationship is exactly linear: 1 au = 149,597,870.7 km.
- • Values are converted through the SI base unit for this quantity rather than pair by pair.
Sources and review
Reviewed 2026-09-22 · Next review 2027-09-22
- • A unit conversion changes how a number is expressed, not how it was measured — the answer can never be more accurate than the value entered.
- • Displayed figures are rounded for readability; the full stored precision of the km value is used in every onward calculation.
Important limitation
This is an educational estimate based only on the values and formula shown. Verify current rates, rules, units, and professional standards before relying on the result. It is not personalized financial or investment advice.
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