Convert square feet to acres (sq ft to ac)
To convert square feet to acres, divide the value in square feet by 43,560. Use it to see how much of an acre a lot, garden or building footprint covers when it is measured in square feet. This square feet to acres converter works both ways: type square feet or acres into either box above and the other box, the worked formula and the chart below update as you type.
A square foot (sq ft or ft²) is the area of a square one foot on each side — exactly 0.09290304 square meters. It is the standard unit for home, office and flooring sizes in the US, and property in India, Canada and the UK is also widely advertised in square feet. One square foot is 0.0000229568 acres.
The acre (ac) is a unit of land equal to 43,560 square feet, or exactly 4,046.8564224 m². It began as the area a team of oxen could plough in a day and was later fixed as one furlong by one chain. Going the other way, one acre equals 43,560 square feet. Acres are used for land and farm sizes in the US, UK, India, Canada and Australia.
How to convert square feet to acres with this tool
- Type a number into the Square feet (sq ft) box — it starts at 10,000 sq ft as an example.
- Read the answer in the Acres (ac) box and in the result panel, which also shows the formula with your number.
- To go the other way, type into the acres box, or press the swap button to open the Acres to Square Feet converter with your value carried over.
- Choose how many decimal places you want, or tap a quick value such as 1,000 sq ft, 5,000 sq ft, 10,000 sq ft.
- Press Copy result to paste the conversion into a message, spreadsheet or note.
Square Feet to Acres converter features
Converts both ways
Type in the square feet box to get acres, or in the acres box to get square feet. The other box follows instantly.
Exact factor
Calculations use 1 ac = 43,560 sq ft, and rounding is applied only to the answer you see — choose Auto or 0–10 decimal places.
Formula with your number
The working is shown under the result, for example 10,000 sq ft ÷ 43,560 = 0.2296 ac, so you can check it or copy the method.
Quick values and chart
Tap common values like 1,000 sq ft, 5,000 sq ft, 10,000 sq ft, or read the square feet-to-acres table further down this page.
Square Feet to Acres formula
The formula is ac = sq ft ÷ 43,560. It is exact because an acre is defined as exactly 43,560 square feet.
The reverse formula is sq ft = ac × 43,560 — or use the Acres to Square Feet converter. Three worked examples:
- A 10,000 sq ft lot: 10,000 sq ft ÷ 43,560 = 0.2296 ac
- A 5,000 sq ft yard: 5,000 sq ft ÷ 43,560 = 0.1148 ac
- Two acres (87,120 sq ft): 87,120 sq ft ÷ 43,560 = 2 ac
Square Feet to Acres quick reference
The values people look up most often, worked out with the exact factor:
- 1 sq ft = 0.0000229568 ac
- 1 ac = 43,560 sq ft
- 1,000 sq ft = 0.02296 ac
- 5,000 sq ft = 0.1148 ac
- 10,000 sq ft = 0.2296 ac
- 21,780 sq ft = 0.5 ac
Quick tip: Divide by 43,560 — or, for a rough figure, by 44,000: 22,000 sq ft is about half an acre (exactly 0.5051 acres).
Related conversions: Square Feet to Square Meters, Hectares to Acres and the full area converter.
Square Feet to Acres conversion table
Values in acres are rounded to 4 decimal places (more for very small numbers). For any value not listed, type it into the converter above.
| sq ft | ac | sq ft | ac |
|---|---|---|---|
| 100 | 0.002296 | 21,780 | 0.5 |
| 500 | 0.01148 | 25,000 | 0.5739 |
| 1,000 | 0.02296 | 30,000 | 0.6887 |
| 2,000 | 0.04591 | 40,000 | 0.9183 |
| 2,500 | 0.05739 | 43,560 | 1 |
| 5,000 | 0.1148 | 50,000 | 1.1478 |
| 7,500 | 0.1722 | 87,120 | 2 |
| 10,000 | 0.2296 | 100,000 | 2.2957 |
| 15,000 | 0.3444 | 217,800 | 5 |
| 20,000 | 0.4591 | 435,600 | 10 |
Square Feet to Acres FAQ
How many acres is 20,000 sq ft?
20,000 square feet is 0.4591 acres: 20,000 sq ft ÷ 43,560 = 0.4591 ac.
How do I convert square feet to acres?
Divide the value in square feet by 43,560. For example, 100,000 sq ft ÷ 43,560 = 2.2957 ac. To convert back, multiply the value in acres by 43,560 — or use the Acres to Square Feet converter.
How many square feet are in one acre?
One acre is 43,560 square feet, because 1 ac × 43,560 = 43,560 sq ft.
What is 100,000 square feet in acres?
How many square feet make an acre?
Exactly 43,560 square feet, so 43,560 sq ft = 1 ac.