Square miles to acres

acres = square miles × 640

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How to convert square miles to acres

One square mile is 640 acres, so multiply the number of square miles by 640. For example, 20 square miles is 20 × 640 = 12,800 acres. To go back, divide by the same number, or multiply by 0.0015625.

Quick estimate

Multiplying by about 600 gets within 6.3% of the exact answer, which is enough to check that a result makes sense.

Where it comes up

Area conversions come up when buying flooring, paint or turf, comparing house and flat sizes, and measuring land and gardens.

square miles	acres
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
11 mi2	7,040 ac
12 mi2	7,680 ac
13 mi2	8,320 ac
14 mi2	8,960 ac
15 mi2	9,600 ac
16 mi2	10,240 ac
17 mi2	10,880 ac
18 mi2	11,520 ac
19 mi2	12,160 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
60 mi2	38,400 ac
70 mi2	44,800 ac
75 mi2	48,000 ac
80 mi2	51,200 ac
90 mi2	57,600 ac
100 mi2	64,000 ac
120 mi2	76,800 ac
150 mi2	96,000 ac
200 mi2	128,000 ac
250 mi2	160,000 ac
300 mi2	192,000 ac
400 mi2	256,000 ac
500 mi2	320,000 ac
750 mi2	480,000 ac
1,000 mi2	640,000 ac
1,500 mi2	960,000 ac
2,000 mi2	1,280,000 ac
5,000 mi2	3,200,000 ac
10,000 mi2	6,400,000 ac

Questions

How many acres are in a square mile?

640 acres.

How do I convert square miles to acres in a spreadsheet?

Put the value in A1 and type =A1*640, then fill the formula down the column.

Are the values in the table exact?

They are calculated from the exact definitions of the units and rounded only for display. Open any row for the full working.