Acres to Square kilometers
1 acre ≈ 0.004047 km². Edit either value to convert instantly.
Conversion formula
km² = acre × (4,046.8564224) × (0.000001)1 acre ≈ 0.00404686 km²
acre (acre)
An international acre is exactly 43,560 square international feet, or 4,046.8564224 m²; old US survey acres differ slightly.
Source: NIST — Revised Unit Conversion Factors for the international foot
square kilometer (km²)
One square kilometer equals exactly 1,000,000 m².
Source: BIPM SI Brochure, 9th edition — SI prefixes and accepted non-SI units
Conversion table
| acre | km² |
|---|---|
| ≈ 0.00404686 | |
| ≈ 0.00809371 | |
| ≈ 0.0202343 | |
| ≈ 0.0404686 | |
| ≈ 0.0607028 | |
| ≈ 0.0809371 | |
| ≈ 0.101171 | |
| ≈ 0.121406 | |
| ≈ 0.161874 | |
| ≈ 0.182109 |
| acre | km² |
|---|---|
| ≈ 0.202343 | |
| ≈ 0.242811 | |
| ≈ 0.28328 | |
| ≈ 0.323749 | |
| ≈ 0.364217 | |
| ≈ 0.404686 | |
| ≈ 0.607028 | |
| ≈ 0.647497 | |
| ≈ 0.687966 | |
| ≈ 0.728434 |
Frequently asked questions
How many square kilometers are in 1 acre?
1 acre ≈ 0.004047 km². km² = acre × (4,046.8564224) × (0.000001)
How do I convert acre to km²?
km² = acre × (4,046.8564224) × (0.000001)
Is 1 acre bigger than 1 square kilometer?
1 acre ≈ 0.004047 km².
Related conversions
All quantities
LengthMass / weightVolumeTemperatureSpeedTimePressureEnergyPowerData 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