Square miles to acres
Multiply square miles by 640 to get acres.
10 mi² = 6,400 ac
How to convert square miles to acres
The acre is exactly 43 560 square feet (4046.8564224 m²). The square mile is exactly 2 589 988.110336 m² (1609.344 m squared).
Worked example — 10 mi²: 10 × 640 = 6,400 ac.
Square miles to acres table
| Square miles | Acres |
|---|---|
| 0.5 mi² | 320 ac |
| 1 mi² | 640 ac |
| 2 mi² | 1,280 ac |
| 5 mi² | 3,200 ac |
| 10 mi² | 6,400 ac |
| 25 mi² | 16,000 ac |
| 50 mi² | 32,000 ac |
| 100 mi² | 64,000 ac |
| 500 mi² | 320,000 ac |
Reverse and related
About square miles and acres
Square mile (mi²)
1 mi² = 640 acDefinition. Exactly 2 589 988.110336 m² (1609.344 m squared)
History and origin
The square mile is a square one mile on each side, built from the statute mile. It equals about 2.59 square kilometres, or 640 acres.
Current use
Square miles measure land, counties and regions in the United States and United Kingdom.
Source: NIST Handbook 44, Appendix C (area); 1959 yard-and-pound agreement
Acre (ac)
1 ac = 0.0015625 mi²Definition. Exactly 43 560 square feet (4046.8564224 m²)
History and origin
The acre began as the area a yoke of oxen could plough in a day, later fixed as 43 560 square feet, or one furlong by one chain. It equals about 4047 square metres.
Current use
Acres are the customary measure for land, farm plots and larger properties in the United States and United Kingdom.
Source: NIST Handbook 44, Appendix C (area); 1959 yard-and-pound agreement
Where people use this
Square miles: land and county area. Acres: land and farm plots, US real estate. 1 square mile is exactly 640 acres.
Every value is carried to full double precision; the display is rounded.
Both units are defined in NIST Handbook 44, Appendix C (area); 1959 yard-and-pound agreement.
Questions people ask
How many acres in a square mile?
One square mile is exactly 640 acres.
How many acres is 2 square miles?
2 square miles is 1280 acres.
How many acres is half a square mile?
Half a square mile is 320 acres.