Acres to Square Miles Converter

One acre is 0.0015625 square miles, which is 1/640 of a square mile. Put the other way, a square mile holds 640 acres, so even a large 1,000-acre ranch is only about 1.56 square miles.

To convert acres to square miles, divide by 640. For example, 320 acres equals exactly 0.5 square miles.

To go from square miles back to acres, multiply by 640. For example, 3 square miles equals exactly 1,920 acres.

Common values in acres converted to square miles, rounded to 6 decimal places.

In a spreadsheet, divide by 640: with acres in cell A2, use =A2/640. Excel's CONVERT function also has area units, according to Microsoft's documentation: =CONVERT(A2,"uk_acre","mi2") uses the international acre, which Microsoft labels uk_acre, and "us_acre" is the U.S. survey acre.

The two acres differ by about two parts per million, so the results only differ in the sixth significant figure or later. For a whole column of large values, rounding the result to a sensible number of figures keeps the sheet readable; the Significant Figures Calculator shows how. Land loans and prices are quoted for the acreage itself, as in the Land Loan Payment Calculator.

The reverse conversion comes first, then every converter that shares a unit with this page, then the converters that show many area units at once.

• Square Miles to Acres Converter: 1 square mile equals exactly 640 acres
• Hectares to Acres Converter: 1 hectare is about 2.471054 acres
• Square Feet to Acres Converter: 1 square foot is about 0.0000229568 acres
• Square Yards to Acres Converter: 1 square yard is about 0.000206612 acres
• Acres to Square Meters Converter: 1 acre equals exactly 4,046.8564224 square meters
• Acres to Square Kilometers Converter: 1 acre equals exactly 0.0040468564224 square kilometers
• Perches to Acres Converter: 1 perch equals exactly 0.00625 acres
• Guntha to Acres Converter: 1 guntha equals exactly 0.025 acres
• Square Miles to Square Km Converter: 1 square mile equals exactly 2.589988110336 square kilometers
• Square Miles to Square Feet Converter: 1 square mile equals exactly 27,878,400 square feet
• Land Area Converter: acres, hectares, ares, cents, gunthas, perches and more at once
• Acreage Converter: acres to square feet, square miles, hectares and more at once
• Area Converter: any area in 16 units, from square millimeters to square miles