1 square mile to acres
1 mi² = 640 ac. Change the amount below, or read the formula and the reference table further down.
1 square mile equals
acres
1 mi² = 640 ac
The formula
Square miles and acres both measure area from the same zero, so a single multiplier does the job.
ac = mi² × 640
Going the other way? Convert acres to square miles.
Square miles to acres table
Values either side of 1 mi².
| Square miles (mi²) | Acres (ac) |
|---|---|
| -4 | -2,560 |
| -3.5 | -2,240 |
| -3 | -1,920 |
| -2.5 | -1,600 |
| -2 | -1,280 |
| -1.5 | -960 |
| -1 | -640 |
| -0.5 | -320 |
| 0 | 0 |
| 0.5 | 320 |
| 1 | 640 |
| 1.5 | 960 |
| 2 | 1,280 |
| 2.5 | 1,600 |
| 3 | 1,920 |
| 3.5 | 2,240 |
| 4 | 2,560 |
| 4.5 | 2,880 |
| 5 | 3,200 |
| 5.5 | 3,520 |
| 6 | 3,840 |
Questions people ask
- How many acres are in a square mile?
- One square mile equals 640 acres.
- How do I convert square miles to acres by hand?
- Multiply the number of square miles by 640. For a rough check, 640 is close enough for most everyday use.
- What is 1 square mile in acres?
- 1 square mile is 640 acres.
Calcuit generates this page from a unit table, so the factors here match every other page on the site.