Paint Calculator
Calculate paint quantity for walls (and optionally the ceiling). Enter the total wall run and height, deduct doors and windows, choose the number of coats and your product’s coverage — the calculator returns total paint and can count.
Paint Calculator
Paint & Wall
Perimeter of the room — or sum of wall lengths for partial painting.
Needed only if “Include ceiling” is on.
Check the paint can — most walls: 350–400 ft²/gal (9–10 m²/L) per coat.
Paint needed
5.54gal
Cans to buy
6 × 1 gal
Total 6 gal
Paintable area
970 ft²
Gross area
1,040 ft²
Deductions: 70 ft²
Calculation breakdown
- 1Gross area:
130 × 8 = 1,040 ft² - 2Deductions:
2 doors × 20 ft² (1.86 m²) + 2 windows × 15 ft² (1.39 m²) - 3Net area × coats:
970 × 2 = 1,940.1 ft² - 4÷ coverage:
1,940.1 ÷ 350 ft²/gal = 5.54 gal
- Buy a little extra for touch-ups; tinted paint from different batches rarely matches perfectly.
- Ceiling paint is usually a separate flat product — if included, it shares the coverage value entered.
Gross area = Wall run × Wall height (+ Ceiling area if included).
Net area = Gross − (Doors × 20 ft²) − (Windows × 15 ft²) (metric: 1.86 m² / 1.39 m²).
Paint = Net area × Coats ÷ Coverage. Cans = Paint ÷ Can size, rounded up.