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Convert Square Miles to Acres

Convert square miles to acres instantly (Square Miles to Acres). 1 mi² = 640 ac.

Converter

square mile (mi²)
acre (ac)

mi² to ac conversion table

Square milesAcres
1 mi²640 ac
2 mi²1280 ac
5 mi²3200 ac
10 mi²6400 ac
25 mi²16000 ac
50 mi²32000 ac
100 mi²64000 ac
1000 mi²640000 ac

Formula

ac = mi² × 640

Worked example

25 mi² × 640 = 16000 ac

Popular conversion examples

Choose an example to open this converter with the value filled in. These are useful examples, not a claim about search rankings.

  • 1 mi² to ac

    640 ac. Open the full square miles to acres converter.

    convertly.website/square-miles-to-acres/?value=1
  • 5 mi² to ac

    3200 ac. Open the full square miles to acres converter.

    convertly.website/square-miles-to-acres/?value=5
  • 100 mi² to ac

    64000 ac. Open the full square miles to acres converter.

    convertly.website/square-miles-to-acres/?value=100
  • 10 mi² to ac

    6400 ac. Open the full square miles to acres converter.

    convertly.website/square-miles-to-acres/?value=10
  • 1 ac to mi²

    0.0015625 mi². Open the full acres to square miles converter.

    convertly.website/acres-to-square-miles/?value=1
  • 10 ac to mi²

    0.015625 mi². Open the full acres to square miles converter.

    convertly.website/acres-to-square-miles/?value=10

About square miles and acres

Square mile (mi²)

A square mile is 640 acres (about 2.59 square kilometers). It is used for the area of cities, parks and counties in the US and UK.

Acre (ac)

The international acre is exactly 4,046.8564224 square meters, or 43,560 square feet. It is used for land area in the US and UK.

Both are units of area; the base unit used internally is m².

Notes

mi² to ac FAQs

How do I convert square miles to acres?

Multiply the number of square miles by 640 to get acres. For example, 25 mi² × 640 = 16000 ac.

How many acres are in one square mile?

1 mi² = 640 ac and 1 ac = 0.0015625 mi². To go the other way, use the acres to square miles converter.

How many acres are in 10 square miles?

10 mi² = 6400 ac, rounded to 6 significant digits. Change the value in the converter above for any other amount.

Is the mi² to ac conversion exact?

Yes. The factor 640 follows directly from the unit definitions (A square mile is 640 acres (about 2.59 square kilometers); the international acre is exactly 4,046.8564224 square meters, or 43,560 square feet), so the only rounding is in the digits you choose to display.

What is the difference between square miles and acres?

A square mile is 640 acres (about 2.59 square kilometers). It is used for the area of cities, parks and counties in the US and UK. The international acre is exactly 4,046.8564224 square meters, or 43,560 square feet. It is used for land area in the US and UK.

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