Acres to Square Miles

Convert acres (ac) to square miles (mi²) with formulas, examples, and conversion tables.

Acres (ac)

Square Miles (mi²)

mi²

1 ac = 0.001563 mi²

Full precision:0.0015625 mi²

Step-by-Step Solution

To convert 1 acres to square miles, we divide by 639.999 because one square mile equals exactly 639.999 acres.

1 square mile = 639.999 acres

Since there are 639.999 acres in every square mile, we divide our value by this factor:

1 ÷ 639.999 = 0.001563 square miles

So 1 acres = 0.001563 square miles.

✓Quick check: 0.001563 × 639.999 = 1 acres

How to Convert Acres to Square Miles

To convert acres to square miles, divide the value by 639.999.

Square Miles = Acres ÷ 639.999

1 square mile = 639.999 acres

Tip: To convert square miles back to acres, multiply by 639.999.

Example 1: 1 ac = 0.001563 mi²
1 ÷ 639.999 = 0.001563

Example 2: 5 ac = 0.007813 mi²
5 ÷ 639.999 = 0.007813

Example 3: 10 ac = 0.015625 mi²
10 ÷ 639.999 = 0.015625