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Square Miles to Acres

Convert square miles (mi²) to acres (ac). Type in either box; the other updates as you go.

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1 mi² = 640 ac

1 square mile equals640 ac
1 acre equals0.0015625 mi²
Formulaac = mi² × 640

How to convert square miles to acres

To convert square miles to acres, multiply the number of square miles by 640.

ac = mi² × 640

Example

Convert 5 square miles to acres:

5 mi² × 640 = 3,200 ac

Square Mile to acre conversion chart

Square Miles (mi²)Acres (ac)
1 mi²640 ac
2 mi²1,280 ac
3 mi²1,920 ac
4 mi²2,560 ac
5 mi²3,200 ac
6 mi²3,840 ac
7 mi²4,480 ac
8 mi²5,120 ac
9 mi²5,760 ac
10 mi²6,400 ac
12 mi²7,680 ac
15 mi²9,600 ac
20 mi²12,800 ac
25 mi²16,000 ac
30 mi²19,200 ac
40 mi²25,600 ac
50 mi²32,000 ac
60 mi²38,400 ac
70 mi²44,800 ac
75 mi²48,000 ac
80 mi²51,200 ac
90 mi²57,600 ac
100 mi²64,000 ac
150 mi²96,000 ac
200 mi²128,000 ac
250 mi²160,000 ac
500 mi²320,000 ac
1,000 mi²640,000 ac

Going the other way? See the acres to square miles chart.

About the units

Square Mile (mi²)

A square mile is 640 acres, about 2.59 square kilometers.

Acre (ac)

An acre is 43,560 square feet, about 4,047 square meters. US and UK land is measured in acres.

Frequently asked questions

How many acres are in a square mile?

There are 640 acres in a square mile.

How many square miles are in an acre?

There are 0.0015625 square miles in an acre.

How do you convert square miles to acres?

To convert square miles to acres, multiply the number of square miles by 640.

What is 5 square miles in acres?

5 square miles equals 3,200 acres.

Convert between square feet, square meters, acres, hectares and other units of area. Open the area converter to see a value in every unit at once.