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Area Conversion: square feet to acres, acres to square feet

Use the online conversion calculators to convert between square feet (ft2) and and acres (ac).

Conversion Calculators

Enter your value in one of the conversion calculators below to convert ft2 to acres or convert acres to ft2.

Convert ft2 to acres

Convert acres to ft2

How to convert ft2 to acres: Use the conversion calculator on the left-hand side titled "Convert ft2 to acres". Enter a value in the ft2 field and click on the "Calculate acres" button. Your answer will appear in the acres field.

How to convert acres to ft2: Use the conversion calculator on the right-hand side titled "Convert acres to ft2". Enter a value in the acres field and click on the "Calculate square feet" button. Your answer will appear in the ft2 field.

Definitions

Below are definitions relating to these conversion formulas:

Unit Symbol Measurement System Description
square inches in2 US Customary Units (and Imperial)  
square feet ft2 US Customary Units (and Imperial) 1 ft2 = 144 in2
square yards yd2 US Customary Units (and Imperial) 1 yd2 = 9 ft2
acres ac US Customary Units (and Imperial) 1 ac = 4,840 yd2
square miles mi2 US Customary Units (and Imperial) 1 mi2 = 640 ac
square millimeters mm2 Metric System
square centimeters cm2 Metric System 1 cm2 = 100 mm2
square decimeters dm2 Metric System 1 dm2 = 100 cm2
square meters m2 Metric System 1 m2 = 100 dm2
hectares ha Metric System 1 ha = 10,000 m2
square kilometer km2 Metric System 1 km2 = 100 ha