Convert Square Inches to Acres

Enter the area in square inches below to get the value converted to acres.

Results in Acres:
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1 sq in = 1.5942E-7 ac

How to Convert Square Inches to Acres

Calculators can be used to convert measurements from one unit to another

To convert a square inch measurement to an acre measurement, multiply the area by the conversion ratio. One square inch is equal to 1.5942E-7 acres, so use this simple formula to convert:

acres = square inches × 1.5942E-7

The area in acres is equal to the square inches multiplied by 1.5942E-7.

For example, here's how to convert 5 square inches to acres using the formula above.
5 sq in = (5 × 1.5942E-7) = 7.9711E-7 ac

Square inches and acres are both units used to measure area. Keep reading to learn more about each unit of measure.

Square Inches

One square inch is equal to the area of a square with sides that are 1 inch in length.

The square inch is a US customary and imperial unit of area. A square inch is sometimes also referred to as a square in. Square inches can be abbreviated as sq in, and are also sometimes abbreviated as in². For example, 1 square inch can be written as 1 sq in or 1 in².


One acre is defined as the area equal to a space that is one chain (66 ft) by one furlong (660 ft), or 10 square chains. That's equal to 43,560 square feet for those unfamiliar with those units of measure.

The acre is a US customary and imperial unit of area. Acres can be abbreviated as ac, for example 1 acre can be written as 1 ac.

Try our acreage calculator to find the area of a plot of land in acres by locating the boundaries on a map.

Square Inch Measurements and Equivalent Acre Conversions

Common square inch values converted to the equivalent acre value
Square Inches Acres
1 sq in 0.00000015942 ac
2 sq in 0.00000031885 ac
3 sq in 0.00000047827 ac
4 sq in 0.00000063769 ac
5 sq in 0.00000079711 ac
6 sq in 0.00000095654 ac
7 sq in 0.000001116 ac
8 sq in 0.0000012754 ac
9 sq in 0.0000014348 ac
10 sq in 0.0000015942 ac
11 sq in 0.0000017536 ac
12 sq in 0.0000019131 ac
13 sq in 0.0000020725 ac
14 sq in 0.0000022319 ac
15 sq in 0.0000023913 ac
16 sq in 0.0000025508 ac
17 sq in 0.0000027102 ac
18 sq in 0.0000028696 ac
19 sq in 0.000003029 ac
20 sq in 0.0000031885 ac
21 sq in 0.0000033479 ac
22 sq in 0.0000035073 ac
23 sq in 0.0000036667 ac
24 sq in 0.0000038261 ac
25 sq in 0.0000039856 ac
26 sq in 0.000004145 ac
27 sq in 0.0000043044 ac
28 sq in 0.0000044638 ac
29 sq in 0.0000046233 ac
30 sq in 0.0000047827 ac
31 sq in 0.0000049421 ac
32 sq in 0.0000051015 ac
33 sq in 0.0000052609 ac
34 sq in 0.0000054204 ac
35 sq in 0.0000055798 ac
36 sq in 0.0000057392 ac
37 sq in 0.0000058986 ac
38 sq in 0.0000060581 ac
39 sq in 0.0000062175 ac
40 sq in 0.0000063769 ac

More Square Inch Area Conversions

US Customary
Convert to Square Miles
1 sq in is equal to 2.491E-10 square miles
Convert to Square Yards
1 sq in is equal to 0.000772 square yards
Convert to Square Feet
1 sq in is equal to 0.006944 square feet
SI Units
Convert to Square Kilometers
1 sq in is equal to 6.4516E-10 square kilometers
Convert to Square Meters
1 sq in is equal to 0.000645 square meters
Convert to Square Centimeters
1 sq in is equal to 6.4516 square centimeters
Convert to Square Millimeters
1 sq in is equal to 645.16 square millimeters
Other Metric Units
Convert to Hectares
1 sq in is equal to 6.4516E-8 hectares
Convert to Ares
1 sq in is equal to 6.4516E-6 ares