Convert square miles to acres
Square miles to acres. Enter a value to convert, or use the square miles to acres chart further down the page.
1 square mile equals 640 acres. Going the other way, 1 acre = 0.0015625 square miles.
How to convert square miles to acres
To convert square miles to acres, multiply the square mile value by 640. You can also divide by 0.0015625 to get the same answer.
ac = mi² × 640
Worked example
Convert 15 mi² to acres:
15 mi² = 9,600 ac
square miles to acres conversion chart
Use this square miles to acres table for quick reference without typing anything.
| square miles (mi²) | acres (ac) |
|---|---|
| 0.01 mi² | 6.4 ac |
| 0.1 mi² | 64 ac |
| 1 mi² | 640 ac |
| 2 mi² | 1,280 ac |
| 3 mi² | 1,920 ac |
| 5 mi² | 3,200 ac |
| 10 mi² | 6,400 ac |
| 20 mi² | 12,800 ac |
| 50 mi² | 32,000 ac |
| 100 mi² | 64,000 ac |
| 1,000 mi² | 640,000 ac |
What is a square mile?
A square mile is exactly 640 acres, or about 2.59 square kilometers. It is the unit used for US county and city areas.
What is an acre?
The acre is exactly 4,046.8564224 square meters, historically the area one ox team could plough in a day. It is the standard unit of land area in the US and UK.
Frequently asked questions
How many acres are in a square mile?
1 square miles equals 640 acres. Going the other way, 1 acres is 0.0015625 square miles.
How do you convert square miles to acres?
To convert square miles to acres, multiply the square mile value by 640. You can also divide by 0.0015625 to get the same answer.
What is 10 square miles in acres?
10 square miles equals 6,400 acres. The conversion chart on this page lists the other values people look up most often.
Related area conversions
Convert square miles to other units
- acres to square miles
- square miles to square meters
- square miles to square feet
- square miles to hectares
- square miles to square kilometers
- square miles to square yards
- square miles to square inches
- square miles to square centimeters
Convert other units to acres
- square meters to acres
- square feet to acres
- hectares to acres
- square kilometers to acres
- square yards to acres
- square inches to acres
- square centimeters to acres
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