Convert square feet to acres
1 ft² = 0.0000229568411387 ac — exactly. Both units are defined against the SI, so this factor is a fraction, not an approximation.
0.000 022 956 841 138 7ac
As a fraction: 1/43560
More converter tools
Readable results
Ranges, ± tolerances, feet/inches and clock durations work in the value field.
Unit picker
Export this result
1 ft² = 0.0000229568411387 ac
Show this value in all 25 area units
- Square kilometers km² 9.290304e-8
- Square hectometers hm² 0.000 009 290 304
- Square decameters dam² 0.000 929 030 4
- Square meters m² 0.092 903 04
- Square decimeters dm² 9.290 304
- Square centimeters cm² 929.0304
- Square millimeters mm² 92 903.04
- Square micrometers µm² 92 903 040 000
- Square nanometers nm² 9.290304e+16
- Hectares ha 0.000 009 290 304
- Ares a 0.000 929 030 4
- Decares daa 0.000 092 903 04
- Square inches in² 144
- Square feet ft² 1
- Square yards yd² 0.111 111 111 111
- Square miles mi² 3.58700642792e-8
- Acres ac 0.000 022 956 841 138 7
- Roods ro 0.000 091 827 364 554 6
- Square rods rd² 0.003 673 094 582 19
- Sections section 3.58700642792e-8
- Townships twp 9.96390674421e-10
- Roofing squares sq 0.01
- Circular mils cmil 183 346 494.442
- Barns b 9.290304e+26
- Tsubos 坪 0.028 103 169 6
Every row is Square foot (ft²) converted through the square meter, in exact rational arithmetic.
How to convert square feet to acres
Multiply the number of square feet by 0.0000229568411387 to get acres.
Acre: Exactly 4840 square yards — historically a day of ploughing.
Square foot to Acre conversion table
| Square feet (ft²) | Acres (ac) |
|---|---|
| 1 ft² | 0.000 022 956 841 |
| 2 ft² | 0.000 045 913 682 |
| 3 ft² | 0.000 068 870 523 |
| 5 ft² | 0.000 114 784 21 |
| 10 ft² | 0.000 229 568 41 |
| 20 ft² | 0.000 459 136 82 |
| 25 ft² | 0.000 573 921 03 |
| 50 ft² | 0.001 147 842 1 |
| 100 ft² | 0.002 295 684 1 |
| 250 ft² | 0.005 739 210 3 |
| 500 ft² | 0.011 478 421 |
| 1000 ft² | 0.022 956 841 |
Acre to Square foot conversion table
| Acres (ac) | Square feet (ft²) |
|---|---|
| 1 ac | 43 560 |
| 2 ac | 87 120 |
| 3 ac | 130 680 |
| 5 ac | 217 800 |
| 10 ac | 435 600 |
| 20 ac | 871 200 |
| 25 ac | 1 089 000 |
| 50 ac | 2 178 000 |
| 100 ac | 4 356 000 |
| 250 ac | 10 890 000 |
| 500 ac | 21 780 000 |
| 1000 ac | 43 560 000 |
Frequently asked
How many acres are in a square foot?
One square foot equals 0.00002295684114 acres (ft² → ac). That figure is exact, not rounded.
How do you convert square feet to acres?
Multiply the number of square feet by 0.0000229568411387 to get acres.
What is 1 ac in square feet?
One acre is 43560 square feet.
What is 10 ft² in ac?
10 ft² = 0.000 229 568 41 ac.
What exactly is a acre?
Exactly 4840 square yards — historically a day of ploughing.