Square Feet to Acres Calculator

By Vinod Kondeti · Updated October 14, 2026

An acre is exactly 43,560 square feet, according to NIST's unit tables. Lot listings mix acres and square feet, so enter square feet here to compare them, or to size a lawn for seed and fertilizer.

Area (ft²)

Cost estimate (optional, enter your local prices)

Price per acre ($)

Acres	–
Square meters	–
Hectares	–
Square yards	–
Estimated cost	–

Working: –

How do I measure for a acres project?

Get the lot area in square feet from a plat, survey or listing.
To go the other way, multiply acres by 43,560.
An acre does not have to be square. A square acre would be about 208.71 ft on each side.

How is the acres amount calculated?

Rectangle: length × width
Circle: π × (diameter ÷ 2)²
Triangle: ½ × base × height
Square yards = ft² ÷ 9; m² = ft² × 0.09290304; acres = ft² ÷ 43,560
Cost = ft² × your price per ft² (flooring: boxes × price per box)

Acres calculator questions

How many square feet are in an acre?

43,560 ft², which is 4,046.86 m² or 0.4047 hectares.

How many acres is a 10,000 sq ft lot?

10,000 ÷ 43,560 = 0.2296 acres.

Sources

Estimates only. Use the coverage or bag size printed on your product. Read the square footage guide for worked examples.