Acres to Square Feet Converter
Convert acres to square feet instantly. 1 acre = 43,560 ft² exactly. Formula, table and the medieval origin of the acre.
Written by Rahman · Last reviewed
Quick answer
One acre equals exactly 43,560 square feet. Multiply acres by 43,560 to get square feet, so a quarter-acre suburban US lot is exactly 10,890 sq ft.
| Square metre (m²) | 4046.856422 |
| Square kilometre (km²) | 0.004046856422 |
| Square centimetre (cm²) | 40468564.22 |
| Square millimetre (mm²) | 4046856422 |
| Hectare (ha) | 0.4046856422 |
| Acre (ac) | 1 |
| Square mile (mi²) | 0.0015625 |
| Square yard (yd²) | 4840 |
| Square foot (ft²) | 43560 |
| Square inch (in²) | 6272640 |
ac to ft² conversion table
| ac | ft² |
|---|---|
| 1 ac | 43560 ft² |
| 2 ac | 87120 ft² |
| 3 ac | 130680 ft² |
| 4 ac | 174240 ft² |
| 5 ac | 217800 ft² |
| 6 ac | 261360 ft² |
| 7 ac | 304920 ft² |
| 8 ac | 348480 ft² |
| 9 ac | 392040 ft² |
| 10 ac | 435600 ft² |
| 20 ac | 871200 ft² |
| 30 ac | 1306800 ft² |
| 40 ac | 1742400 ft² |
| 50 ac | 2178000 ft² |
| 60 ac | 2613600 ft² |
| 70 ac | 3049200 ft² |
| 80 ac | 3484800 ft² |
| 90 ac | 3920400 ft² |
| 100 ac | 4356000 ft² |
| 250 ac | 10890000 ft² |
| 500 ac | 21780000 ft² |
| 1000 ac | 43560000 ft² |
How to convert ac to ft²
The acre originated in medieval England as the area a yoke of oxen could plough in a single day: a practical, not geometric, definition. It was later standardised as a rectangle 1 furlong (660 ft) by 1 chain (66 ft), and 660 × 66 = 43,560 exactly, which is why the modern figure is a clean whole number despite its agricultural origin.
A US football field, including both end zones, covers almost exactly 1.32 acres (57,600 sq ft), a commonly used size reference for judging how large a given acreage actually is, since most people have a rough intuitive sense of a football field's footprint but not of an acre as an abstract number, and it holds up as a mental anchor for smaller residential lots too.