Kilometers to Astronomical units
1 km ≈ 6.685 × 10⁻⁹ au. Edit either value to convert instantly.
Conversion formula
au = km × (1,000) × (1 / 1.495978707 × 10¹¹)1 km ≈ 6.68459 × 10⁻⁹ au
kilometer (km)
One kilometer equals exactly 1,000 m.
Source: BIPM SI Brochure, 9th edition — SI prefixes and accepted non-SI units
astronomical unit (au)
One astronomical unit equals exactly 1.495978707 × 10¹¹ m.
Source: BIPM SI Brochure, 9th edition — SI prefixes and accepted non-SI units
Conversion table
| km | au |
|---|---|
| ≈ 6.68459 × 10⁻⁹ | |
| ≈ 1.33692 × 10⁻⁸ | |
| ≈ 3.34229 × 10⁻⁸ | |
| ≈ 6.68459 × 10⁻⁸ | |
| ≈ 1.00269 × 10⁻⁷ | |
| ≈ 1.33692 × 10⁻⁷ | |
| ≈ 1.67115 × 10⁻⁷ | |
| ≈ 2.00538 × 10⁻⁷ | |
| ≈ 2.67383 × 10⁻⁷ | |
| ≈ 3.00806 × 10⁻⁷ |
| km | au |
|---|---|
| ≈ 3.34229 × 10⁻⁷ | |
| ≈ 4.01075 × 10⁻⁷ | |
| ≈ 4.67921 × 10⁻⁷ | |
| ≈ 5.34767 × 10⁻⁷ | |
| ≈ 6.01613 × 10⁻⁷ | |
| ≈ 6.68459 × 10⁻⁷ | |
| ≈ 0.00000100269 | |
| ≈ 0.00000106953 | |
| ≈ 0.00000113638 | |
| ≈ 0.00000120323 |
Frequently asked questions
How many astronomical units are in 1 kilometer?
1 km ≈ 6.685 × 10⁻⁹ au. au = km × (1,000) × (1 / 1.495978707 × 10¹¹)
How do I convert km to au?
au = km × (1,000) × (1 / 1.495978707 × 10¹¹)
Is 1 kilometer bigger than 1 astronomical unit?
1 km ≈ 6.685 × 10⁻⁹ au.
Related conversions
All quantities
Mass / weightVolumeTemperatureAreaSpeedTimePressureEnergyPowerData storageFuel economyAngleFrequencyForceTorqueDensityData transfer rateAccelerationElectric chargeElectric currentVoltageCapacitanceAbsorbed doseDynamic viscosityElectrical resistanceIlluminanceKinematic viscosityLuminanceMagnetic flux densityMass flow rateRadioactivityVolumetric flow rateElectrical conductanceEquivalent doseInductanceMagnetic fluxMolar concentrationSolution mass concentrationAmount of substanceAngular velocityCountLuminous fluxLuminous intensityMagnetic field strengthMagnetomotive forceAbsorbed dose rateRadiation exposureThermal conductivity