Area Formulas
Rectangle: A = length × width
Circle: A = π × (diameter/2)²
Triangle: A = (base × height) / 2
Trapezoid: A = (base1 + base2) / 2 × height
Unit conversions:
1 sq ft = 144 sq in = 0.0929 sq m = 0.1111 sq yd
1 acre = 43,560 sq ft
Coverage Reference
| Material | Coverage per Unit |
|---|---|
| Interior paint (1 gal) | ~350–400 sq ft |
| Tile (12×12 box of 20) | 20 sq ft |
| Hardwood flooring (1 box) | ~20 sq ft |
| Carpet (sold by sq yd) | ÷ 9 = sq yd needed |
| Mulch (2 cu ft bag, 3" deep) | ~8 sq ft |