Quick answer
1 acre = 43,560 sq ft. Convert with sq ft = acres × 43,560 or acres = sq ft ÷ 43,560. Use the acres to square feet converter or the square footage calculator.
Square footage acreage calculator formula
Square feet = Acres × 43,560 Acres = Square feet ÷ 43,560
| Acres | Square feet | Typical use |
|---|---|---|
| 0.25 | 10,890 | Small suburban lot |
| 0.5 | 21,780 | Larger residential lot |
| 1 | 43,560 | One acre |
| 2 | 87,120 | Small acreage |
| 5 | 217,800 | Hobby farm / large parcel |
Lawn & yard square footage
Measure length × width for rectangular lawns. For irregular yards, split into rectangles and triangles. Example: 50 × 100 = 5,000 sq ft ≈ 0.11 acres. Sod and seed are usually sold by the square foot or pallet coverage.
Roof square footage calculator
Roof area is larger than the house footprint because of pitch:
Roof sq ft = Footprint sq ft × Pitch multiplier Roofing squares = Roof sq ft ÷ 100
| Pitch | Multiplier | 1,200 sq ft footprint |
|---|---|---|
| 4:12 | 1.054 | 1,265 sq ft |
| 6:12 | 1.118 | 1,342 sq ft |
| 8:12 | 1.202 | 1,442 sq ft |
| 12:12 | 1.414 | 1,697 sq ft |
Add 10–15% for waste, hips, and valleys when ordering shingles.
Related tools
Area math: how to calculate square footage. Indoor projects: room square footage guide. Volume from area: square feet to cubic yards.