Acres to square miles

square miles = acres × 0.0015625

How to convert acres to square miles

One acre is 0.0015625 square miles, so multiply the number of acres by 0.0015625. For example, 20 acres is 20 × 0.0015625 = 0.03125 square miles. To go back, divide by the same number, or multiply by 640.

Quick estimate

Multiplying by about 0.002 gets within 28.0% 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.

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
11 ac	0.0171875 mi2
12 ac	0.01875 mi2
13 ac	0.0203125 mi2
14 ac	0.021875 mi2
15 ac	0.0234375 mi2
16 ac	0.025 mi2
17 ac	0.0265625 mi2
18 ac	0.028125 mi2
19 ac	0.0296875 mi2
20 ac	0.03125 mi2
25 ac	0.0390625 mi2
30 ac	0.046875 mi2
40 ac	0.0625 mi2
50 ac	0.078125 mi2
60 ac	0.09375 mi2
70 ac	0.109375 mi2
75 ac	0.1171875 mi2
80 ac	0.125 mi2
90 ac	0.140625 mi2
100 ac	0.15625 mi2
120 ac	0.1875 mi2
150 ac	0.234375 mi2
200 ac	0.3125 mi2
250 ac	0.390625 mi2
300 ac	0.46875 mi2
400 ac	0.625 mi2
500 ac	0.78125 mi2
750 ac	1.171875 mi2
1,000 ac	1.5625 mi2
1,500 ac	2.34375 mi2
2,000 ac	3.125 mi2
5,000 ac	7.8125 mi2
10,000 ac	15.625 mi2

Questions

How many square miles are in a acre?

0.0015625 square miles.

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

Put the value in A1 and type =A1*0.0015625, 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.