How to convert acres to square feet
To convert acres to square feet, multiply by 43,560. One acre is exactly 43,560 square feet, a figure that comes up whenever land listings, building plans and lawn-care quotes use different units.
Acre to Square Foot conversion table
| Acre (ac) | Square Foot (ft²) |
|---|---|
| 0.1 ac | 4,356 ft² |
| 0.5 ac | 21,780 ft² |
| 1 ac | 43,560 ft² |
| 2 ac | 87,120 ft² |
| 3 ac | 130,680 ft² |
| 4 ac | 174,240 ft² |
| 5 ac | 217,800 ft² |
| 10 ac | 435,600 ft² |
| 20 ac | 871,200 ft² |
| 25 ac | 1,089,000 ft² |
| 50 ac | 2,178,000 ft² |
| 100 ac | 4,356,000 ft² |
| 500 ac | 21,780,000 ft² |
| 1,000 ac | 43,560,000 ft² |
About the units
Acre (ac)
An acre equals 43,560 square feet (4,046.8564224 m²) and is used for land in the US and UK.
Square Foot (ft²)
A square foot equals exactly 0.09290304 m² and is the standard unit for US home sizes.
How to use this converter
- Type the number of acres (ac) in the input box.
- The result in square feet appears instantly — no button needed.
- See the same value in every other area unit just below.
- Use “Swap units” to convert square feet back to acres.
When you’ll use the acre to square foot conversion
A property listing says the lot is 0.35 acres, but the builder’s plans are drawn in square feet. Converting gives about 15,246 ft², so you can see how much room is left after the house footprint.
A lawn-care company prices treatments per 1,000 square feet and your yard is a quarter acre. Converting to 10,890 ft² lets you check the quote.
💡 For a quick estimate in your head, multiply by about 44,000 (the exact factor is 43,560).
Watch out for these mix-ups
- Assuming an acre is a square of a fixed side length — it can be any shape.
- Confusing acres with hectares, which are about 2.47 times larger.
- Using the gross lot size when setbacks and easements reduce usable land.
- Rounding 43,560 to 40,000 for estimates that matter.
Tips for better results
- Ask for the survey plat to see the lot’s real dimensions.
- Subtract the house, driveway and paths to estimate lawn area.
- Use the area converter if you also need hectares or square meters.
💡 Practical tip: An acre is roughly three quarters of an American football field including the end zones — a handy mental picture.
Frequently asked questions
How many square feet are in one acre?
One acre equals 43,560 square feet. 43,560 is the exact factor used by this converter.
How do I convert acres to square feet?
Multiply the value in acres by 43,560. To go the other way, multiply square feet by 0.0000229568411387.
What is 10 ac in ft²?
10 ac = 435,600 ft². Also, 5 ac = 217,800 ft² and 100 ac = 4,356,000 ft².
What is the difference between a acre and a square foot?
An acre equals 43,560 square feet (4,046.8564224 m²) and is used for land in the US and UK. A square foot equals exactly 0.09290304 m² and is the standard unit for US home sizes.
Is this tool free and private?
Yes — the Acre to Square Foot is completely free with no sign-up, and it runs entirely in your browser, so the values you enter are never uploaded to our servers.
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