Calculadora de Galões de Tinta — Formula
## How to Calculate Paint Gallons with Deductions
### Formula
**Net Area = (Perimeter × Height) - (Doors × 21 sq ft) - (Windows × 15 sq ft)**
**Gallons = (Net Area × Coats) / Coverage Rate**
A standard door opening is about 3 ft × 7 ft = 21 sq ft. A standard window is about 3 ft × 5 ft = 15 sq ft. One gallon of paint covers approximately 350 sq ft.
### Formula
**Net Area = (Perimeter × Height) - (Doors × 21 sq ft) - (Windows × 15 sq ft)**
**Gallons = (Net Area × Coats) / Coverage Rate**
A standard door opening is about 3 ft × 7 ft = 21 sq ft. A standard window is about 3 ft × 5 ft = 15 sq ft. One gallon of paint covers approximately 350 sq ft.
Exemplo Resolvido
A 14×14 ft room (56 ft perimeter), 8 ft ceiling, 2 doors, 4 windows, 2 coats.
- Gross wall area = 56 × 8 = 448 sq ft
- Door deductions = 2 × 21 = 42 sq ft
- Window deductions = 4 × 15 = 60 sq ft
- Net paintable area = 448 - 42 - 60 = 346 sq ft
- Gallons = 346 × 2 / 350 = 1.98 → 2 gallons