Acres to Square Feet
Convert acres to square feet instantly — one acre is 43560 square feet.
| Acres | Square Feet |
|---|---|
| 1 ac | 43560 ft² |
| 2 ac | 87120 ft² |
| 3 ac | 130680 ft² |
| 5 ac | 217800 ft² |
| 10 ac | 435600 ft² |
| 25 ac | 1089000 ft² |
| 50 ac | 2178000 ft² |
| 100 ac | 4356000 ft² |
How to use
- Enter a value in the Acres field.
- The Square Feet figure appears immediately — no button to press.
- Typing in the Square Feet field converts back to Acres the same way.
- Use the reference table for the values that come up most often.
Acres to Square Feet formula
To convert acres to square feet, multiply by 43560.
ft² = ac × 43560
Put another way, one acre is exactly 43,560 square feet.
Why this factor: the acre and the square foot are both defined against the square meter, so dividing one definition by the other gives 43560 directly. Both definitions are set out in full below.
To go the other way, divide by 43560 — or use the Square Feet to Acres converter, which is the same calculation reversed.
Worked example
Given 1000 ac, multiplying by 43560 yields 43560000 ft².
1000 ac × 43560 = 43560000 ft²
The converter above does this for any value you type, in either direction.
What is an acre?
An acre is the customary land area unit of the US and UK, historically a day's ploughing for one team of oxen.
Definition: One chain by one furlong — 43,560 square feet — which is exactly 4,046.8564224 square meters.
Where it is used: US and UK property and farmland, development parcels, and land sales.
Worth knowing: 640 acres make one square mile, the basis of the US Public Land Survey grid.
What is a square foot?
A square foot is the primary unit of floor area in the United States.
Definition: Exactly 0.09290304 square meter, following from the exact 0.3048 m foot.
Where it is used: US and Indian property listings, commercial leases, and paint and flooring coverage.
Acres vs Square Feet
The acre and the square foot belong to the same family of units, so converting between them is usually a matter of shifting a decimal point or applying a small whole-number factor.
Frequently asked questions
How many square feet are in an acre?
One acre equals 43560 square feet.
What is the formula to convert acres to square feet?
Multiply the number of acres by 43560. To reverse it, divide by 43560 instead.
How do I convert square feet back to acres?
Divide by 43560, which is the same as multiplying by 2.29568411e-05.
How many square feet are in 10 acres?
10 ac works out to 435600 ft².
Is there anything to watch out for with acres?
640 acres make one square mile, the basis of the US Public Land Survey grid.
How is the acre defined?
One chain by one furlong — 43,560 square feet — which is exactly 4,046.8564224 square meters.