1 acre = 43560 square feet
An acre is exactly 43,560 square feet — the figure comes from a chain by a furlong, the medieval one-day ploughing measure it descends from.
Formula ft² = ac × 43560
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| Acre | Square foot |
|---|---|
| 1 ac | 43560 ft² |
| 2 ac | 87120 ft² |
| 3 ac | 130680 ft² |
| 4 ac | 174240 ft² |
| 5 ac | 217800 ft² |
| 10 ac | 435600 ft² |
| 15 ac | 653400 ft² |
| 20 ac | 871200 ft² |
| 25 ac | 1089000 ft² |
| 50 ac | 2178000 ft² |
| 100 ac | 4356000 ft² |
| 500 ac | 21780000 ft² |
| 1000 ac | 43560000 ft² |
| Square foot | Acre |
|---|---|
| 1 ft² | 0.000023 ac |
| 2 ft² | 0.000046 ac |
| 3 ft² | 0.000069 ac |
| 4 ft² | 0.000092 ac |
| 5 ft² | 0.000115 ac |
| 10 ft² | 0.00023 ac |
| 15 ft² | 0.000344 ac |
| 20 ft² | 0.000459 ac |
| 25 ft² | 0.000574 ac |
| 50 ft² | 0.001148 ac |
| 100 ft² | 0.002296 ac |
| 500 ft² | 0.011478 ac |
| 1000 ft² | 0.022957 ac |
| Situation | From | To |
|---|---|---|
| Quarter acre | 0.25 acres | 10,890 ft² |
| Half acre | 0.5 acres | 21,780 ft² |
| One acre | 1 acre | 43,560 ft² |
| Large garden | 2.5 acres | 108,900 ft² |
| Small farm | 10 acres | 435,600 ft² |
| One square mile | 640 acres | 27,878,400 ft² |
An acre is about 208.7 ft on each side, because the square root of 43,560 is 208.71.
Land is sold by the acre in the US. A football field including end zones is 57,600 ft², about 1.32 acres.
An acre is a measure of area, not a shape. Do not confuse it with the hectare, which is 2.47 acres.
The acre was defined as a furlong by a chain, 660 ft by 66 ft, which is 43,560 square feet.
Related guides: Imperial vs metric: differences and quick conversion tricks