Convert Square Miles to Acres

Q: How many acres are in a square mile?

There are 640 acres in one square mile.

Q: How many square miles are in a acre?

There are 0.0015625 square miles in one acre.

1 square mile = 640 acres. Type any value below to convert in either direction — the calculation happens in your browser.

square miles

acres

Square Miles to Acres formula

Multiply the number of square miles by 640 to get acres.

acres = square miles × 640

To go the other way: divide the number of acres by 640, or multiply by 0.0015625.

square miles = acres ÷ 640

Square Miles to Acres conversion table

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
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

Acres to Square Miles conversion table

Acres	Square Miles
1 ac	0.0015625 mi²
2 ac	0.003125 mi²
3 ac	0.0046875 mi²
4 ac	0.00625 mi²
5 ac	0.0078125 mi²
6 ac	0.009375 mi²
7 ac	0.0109375 mi²
8 ac	0.0125 mi²
9 ac	0.0140625 mi²
10 ac	0.015625 mi²

About the square mile

A square mile is about 2.59 square kilometres and is used for US counties, states and land surveys.

About the acre

An acre is 43,560 square feet, about 4,047 square metres — roughly a US football field without the end zones.

Frequently asked questions

How many acres are in a square mile?

There are 640 acres in one square mile.

How many square miles are in a acre?

There are 0.0015625 square miles in one acre.

Is this conversion exact?

The ratio between the square mile and the acre is fixed by definition, so the conversion is exact — the figures shown here are rounded for readability only.

What is 10 square miles in acres?

10 square miles equals 6,400 acres.

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