Square Miles to Acres

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

mi²
ac
1 square miles (mi²) = 639.999434129 acres (ac)
Round to:
Acres + Sq Feet:639 acres 4e4 sq ft
Step-by-Step Solution
1Write the conversion factor:
1 square mile = 639.999434129 acres
2Multiply the value by the conversion factor:
1 × 639.999434129 = 639.999434129
3Result:
1 square miles (mi²) = 639.999434129 acres (ac)
↔ Acres to Square Miles

How to Convert square miles to acres

To convert square miles to acres, multiply the value by 639.999434129.

The Formula

acres = square miles × 639.999434129

Key Fact

1 square mile = 639.999434129 acres

Tip: To convert acres back to square miles, divide by 639.999434129.

square miles to acres Table

square milesacres
1 mi²639.999434129 ac
2 mi²1279.99886826 ac
5 mi²3199.99717065 ac
10 mi²6399.99434129 ac
20 mi²12799.9886826 ac
25 mi²15999.9858532 ac
50 mi²31999.9717065 ac
100 mi²63999.9434129 ac
250 mi²159999.858532 ac
500 mi²319999.717065 ac
1000 mi²639999.434129 ac

1 square mile in Other Units

Unit1 mi² =
Square Miles to Square Kilometers2.58998811 km²
Square Miles to Hectares258.998811 ha
Square Miles to Square Meters2589988.11 m²
Square Miles to Square Centimeters2.58998811e10 cm²
Square Miles to Square Millimeters2.58998811e12 mm²
Square Miles to Acres639.999434129 ac
Square Miles to Square Yards3097601.33329 yd²
Square Miles to Square Feet27878411.9996 ft²
Square Miles to Square Inches4.01448959948e9 in²
Square Miles to Ares25899.8811 a
Square Miles to Barns2.58998811e34 b

Related Conversions

Square Meters to Square FeetSquare Feet to Square MetersAcres to HectaresHectares to AcresAcres to Square MetersSquare Meters to AcresSquare Kilometers to Square MilesSquare Miles to Square KilometersSquare Feet to Square InchesSquare Inches to Square Feet