Paint Usage Calculator
Estimate topcoat/primer liters, buckets and cost from room size, openings, coats and coverage.
- Enter L×W×H, door/window counts and areas
- Optional ceiling, coats, coverage, waste, primer and price
- Wall area = 2(L+W)H − openings (+ceiling)
- Liters = area × coats ÷ coverage × (1+waste%)
- Buckets = ceil(liters ÷ bucket size)
Typical coverage ~8.6–12 m²/L; two topcoats are common. Primer helps on new or patched walls. Runs locally in your browser.