Paint calculator for wall coverage

Length

Height / width

Coats

Coverage (area per volume unit)

Openings (same area units)

Waste (%)

Calculate Copy result

— Enter dimensions and calculate.

• 20 × 8 wall, 20 openings, 2 coats, 350 coverage, 10% waste → 0.88 theoretical → buy 1.00
• Net area = length × height − openings
• Purchase rounds up to the next quarter unit

For estimating and planning. Use the product label coverage; not a substitute for licensed professional judgment.

Method: net area = L×W − openings; theoretical = (net × coats ÷ coverage) × (1 + waste%). Purchase rounds up to the next quarter unit. Example: 20×8 wall, 20 openings, 2 coats, 350 coverage, 10% waste → 0.88 theoretical → buy 1.00.