---
title: "Astronomical units to Kilometers — AU to km converter"
description: "1 astronomical unit = 149,597,870 kilometers. Conversion table, the exact formula, and a calculator for any value."
url: https://atoneplace.net/convert/astronomical-units-to-km/
site: "At One Place"
---

# Astronomical units to kilometers

**1 astronomical unit in kilometers: 1 AU = 149,597,870 km**

km = AU × 149,597,870.7

To convert astronomical units to kilometers, multiply by 149,597,870.7. The table below gives the values people look up most often, and the converter works for any number.

## Astronomical units to kilometers table

*Common astronomical unit values converted to kilometers.*

| Astronomical units | Kilometers |
| --- | --- |
| 1 AU | 149,597,870 |
| 2 AU | 299,195,740 |
| 3 AU | 448,793,610 |
| 4 AU | 598,391,480 |
| 5 AU | 747,989,350 |
| 10 AU | 1,495,978,700 |
| 15 AU | 2,243,968,100 |
| 20 AU | 2,991,957,400 |
| 25 AU | 3,739,946,800 |
| 30 AU | 4,487,936,100 |
| 40 AU | 5,983,914,800 |
| 50 AU | 7,479,893,500 |
| 75 AU | 11,219,840,000 |
| 100 AU | 14,959,787,000 |
| 250 AU | 37,399,468,000 |
| 500 AU | 74,798,935,000 |
| 1,000 AU | 149,597,870,000 |

## How the conversion works

The relationship is km = AU × 149,597,870.7. Both units measure length, so the conversion is a fixed factor that never changes.

## Common questions

### How many kilometers are in one astronomical unit?

One astronomical unit equals 149,597,870 kilometers. km = AU × 149,597,870.7.

### How do you convert astronomical units to kilometers?

Use km = AU × 149,597,870.7. So 10 AU is 1,495,978,700 km.

### How many astronomical units are in one kilometer?

One kilometer equals 6.685 × 10^-9 astronomical units, which is the reverse of the conversion above.

## Related pages

- [Kilometers to Astronomical units](https://atoneplace.net/convert/km-to-astronomical-units/)
- [Astronomical units to Meters](https://atoneplace.net/convert/astronomical-units-to-meters/)
- [Astronomical units to Centimeters](https://atoneplace.net/convert/astronomical-units-to-cm/)
- [Astronomical units to Millimeters](https://atoneplace.net/convert/astronomical-units-to-mm/)
- [Astronomical units to Miles](https://atoneplace.net/convert/astronomical-units-to-miles/)
- [Astronomical units to Yards](https://atoneplace.net/convert/astronomical-units-to-yards/)
- [Astronomical units to Feet](https://atoneplace.net/convert/astronomical-units-to-feet/)
- [Astronomical units to Inches](https://atoneplace.net/convert/astronomical-units-to-inches/)

## Sources

- Guide for the Use of the International System of Units (SP 811) — NIST (https://www.nist.gov/pml/special-publication-811) [Public domain (US Government)]
- The International System of Units (SI Brochure) — Bureau International des Poids et Mesures (https://www.bipm.org/en/publications/si-brochure)
- Calculated on this page — At One Place (/about/)