How to convert square miles to acres
Formula: ac = mi² × 640
Worked example: 1 mi² → 1 × 640 = 640 ac
Square miles to acres conversion chart
| Square miles (mi²) | Acres (ac) |
|---|---|
| 1 mi² | 640 ac |
| 2 mi² | 1,280 ac |
| 3 mi² | 1,920 ac |
| 4 mi² | 2,560 ac |
| 5 mi² | 3,200 ac |
| 6 mi² | 3,840 ac |
| 7 mi² | 4,480 ac |
| 8 mi² | 5,120 ac |
| 9 mi² | 5,760 ac |
| 10 mi² | 6,400 ac |
| 12 mi² | 7,680 ac |
| 15 mi² | 9,600 ac |
| 20 mi² | 12,800 ac |
| 25 mi² | 16,000 ac |
| 30 mi² | 19,200 ac |
| 40 mi² | 25,600 ac |
| 50 mi² | 32,000 ac |
| 75 mi² | 48,000 ac |
| 100 mi² | 64,000 ac |
| 250 mi² | 160,000 ac |
| 500 mi² | 320,000 ac |
| 1,000 mi² | 640,000 ac |
What is a square mile?
The square mile equals 640 acres, about 2.59 km². It measures the area of US cities, counties and states, and in the public land survey a one-square-mile parcel is called a section.
What is an acre?
The acre equals 43,560 square feet, about 4,047 m² or 0.405 hectare. It is the US and UK unit for land, lots and farms. An American football field, end zones included, covers about 1.32 acres.