How to Convert Acres to Square Kilometers
Converting acres to square kilometers is useful for US agricultural land to metric geographic measurements.
20.00 Acres = 0.0809 Square Kilometers
To convert acres to square kilometers, multiply by 0.004046856422. One acre equals exactly 0.004046856422 square kilometers.
Step-by-Step
- Start with your value: 20.00 Acres
- Multiply by 0.004046856422
- Result: 0.0809 Square Kilometers
Formula: km² = ac × 0.004046856422
💡 Memory Tip: 1 acre ≈ 43,560 ft² ≈ 4,047 m² ≈ 0.405 ha. About 90% of an American football field including end zones.
Acres to Square Kilometers Quick Reference
| Acres | Square Kilometers | Common Reference |
|---|---|---|
| 0.25 | 0.001012 | Suburban lot |
| 1 | 0.004047 | Standard acre |
| 5 | 0.020234 | Small farm |
| 40 | 0.161874 | Large farm parcel |
| 640 | 2.59 | 1 square mile |
Understanding Acres and Square Kilometers
What is a Acre?
An acre is an imperial unit of area equal to 4,046.86 m² or 43,560 ft². Originally the amount of land tillable by one man with one ox in one day, the acre is widely used in the US, UK, and Commonwealth countries for real estate and agricultural land.
What is a Square Kilometer?
A square kilometer (km²) is a metric unit of area equal to 1,000,000 square meters or 100 hectares. It is used for measuring large geographic areas such as cities, lakes, national parks, and countries.
Learn more about Acres on Wikipedia →
Key Facts
- 1 Acre = 0.004046856422 Square Kilometers
- 1 Square Kilometer = 247.10538147 Acres
- ac is the symbol for Acres
- km² is the symbol for Square Kilometers
Key Conversion Facts
- 1 Acre = 0.004046856422 Square Kilometers
- 1 Square Kilometer = 247.10538147 Acres
- Formula: km² = ac × 0.004046856422
- Reverse formula: ac = km² × 247.10538147
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Frequently Asked Questions
20 Acres equals 0.0809 Square Kilometers. Multiply by 0.004046856422.
km² = ac × 0.004046856422
For 20 Acres: 20 × 0.004046856422 = 0.0809 km²
Multiply your acres value by 0.004046856422. For a quick estimate, use 0.004 as the multiplier. Example: 20 ac × 0.004 ≈ 0.08 km² (exact: 0.0809).
1 Square Kilometer = 247.10538147 Acres. To convert square kilometers back to acres, multiply by 247.10538147.
An acre is an imperial unit of area equal to 4,046.86 m² or 43,560 ft². Originally the amount of land tillable by one man with one ox in one day, the acre is widely used in the US, UK, and Commonwealth countries for real estate and agricultural land.