Kilometers ↔ Astronomical Units Converter
Convert between kilometers and astronomical units instantly
📚 Kilometers ↔ Astronomical Units Conversion Details
Kilometers to AU Formula
To convert kilometers to astronomical units, divide by approximately 149.6 million km.
AU to Kilometers Formula
To convert astronomical units to kilometers, multiply by approximately 149.6 million km.
Bidirectional Conversion
This converter works both ways simultaneously:
- Type in kilometers → AU updates automatically
- Type in AU → kilometers updates automatically
- No buttons to click - works as you type
What is an Astronomical Unit?
1 AU is the average distance from Earth to the Sun, approximately:
- 149,597,870.7 kilometers
- 92,955,807.3 miles
- 8.317 light-minutes
🪐 How This Converter Works
This is a bidirectional converter that works in real-time:
- Kilometers → AU: When you type in the kilometers field, the AU field automatically updates
- AU → Kilometers: When you type in the AU field, the kilometers field automatically updates
- No swapping needed: Both conversions happen simultaneously
- Real-time: Updates happen as you type, no button clicks required
const AU_IN_KM = 149597870.7;
// Kilometers to AU:
AU = kilometers ÷ AU_IN_KM
// AU to Kilometers:
kilometers = AU × AU_IN_KM
// Example 1: Type "149597870.7" in kilometers
AU = 149597870.7 ÷ 149597870.7 = 1
// Example 2: Type "0.5" in AU
kilometers = 0.5 × 149597870.7 = 74798935.35
📊 Common Astronomical Distances
| Celestial Object | Distance (AU) | Distance (km) |
|---|---|---|
| 🌍 Earth to Sun | 1 AU | 149.6 million km |
| ♀ Venus to Sun | 0.723 AU | 108.2 million km |
| ♂ Mars to Sun | 1.524 AU | 227.9 million km |
| ♃ Jupiter to Sun | 5.203 AU | 778.5 million km |
| 🪐 Pluto to Sun | 39.48 AU | 5.9 billion km |
| ☄️ Voyager 1 | ~163 AU | ~24.4 billion km |
❓ Frequently Asked Questions
A: An astronomical unit is the average distance from Earth to the Sun, approximately 149,597,870.7 kilometers.
A: One AU equals exactly 149,597,870.7 kilometers.
A: AU provides a convenient scale for measuring distances within our solar system, making it easier to compare planetary distances.
A: It's the average distance. Earth's orbit is elliptical, so the actual distance varies between about 0.983 AU and 1.017 AU.