DIY CalculatorAn acre is 43,560 square feet — about the size of a square 208.7 feet on each side, or roughly 90% of an American football field without the end zones.
Good to know
- Acres = square feet ÷ 43,560.
- 1 hectare = 2.471 acres.
- A typical suburban lot is 0.2–0.5 acres.
- For legal boundaries, rely on a survey rather than tape measurements.
Common sizes converted
| Size | Square feet | Square yards | Square meters | Acres |
|---|---|---|---|---|
| 10 × 10 ft | 100 | 11.11 | 9.29 | 0.002 |
| 12 × 12 ft | 144 | 16 | 13.38 | 0.003 |
| 12 × 15 ft | 180 | 20 | 16.72 | 0.004 |
| 15 × 20 ft | 300 | 33.33 | 27.87 | 0.007 |
| 20 × 25 ft | 500 | 55.56 | 46.45 | 0.011 |
| 50 × 100 ft | 5,000 | 556 | 465 | 0.115 |
| 100 × 200 ft | 20,000 | 2,222 | 1,858 | 0.459 |
How to use this calculator
- Measure the length and width (or the diameter of a round area). Use any unit — feet, inches, yards or meters.
- Split odd shapes into rectangles, circles and triangles, and add each one with “Add another area”.
- Optionally enter a price to estimate the cost.
Add this calculator to your website
Run a landscaping supply, garden center or DIY blog? Paste this code into your page to let visitors use the acreage calculator right there. It is free, has no ads, and resizes itself to fit.
More calculators
Frequently asked questions
How many feet are in an acre?
An acre is an area, not a length: 43,560 square feet. A square acre measures about 208.7 feet on each side.
How do I calculate acreage of an irregular lot?
Split it into rectangles and triangles, calculate each area in square feet, add them together and divide by 43,560.