Surface Paint Calculator
Estimate paint litres for a rectangular ceiling, four exterior walls, or a rectangular fence.
Coverage and coats are editable assumptions. The initial examples are 10 m²/L for ceilings, 7 for exterior walls and 6 for fences, with 2 coats. They are not prescribed values. Use your product label and surface conditions. No costs or can counts are calculated. Inputs stay in your browser.
Painted area:
Estimated paint (L):
Ceiling = length × width. Exterior = 2 × (length + width) × height − openings. Fence = length × height × sides. Litres = area ÷ coverage × coats.
A QUICK WALKTHROUGH
How to use this tool
- Choose a surface, enter its dimensions, then set coverage and coats before calculating.
Surface
This rectangular model excludes roof gables, irregular surfaces and waste allowances. Calculate separate sections yourself. Coverage depends on your product and surface; this tool does not recommend it.
Coverage per litre (m²/L)
Coverage and coats are editable assumptions. The initial examples are 10 m²/L for ceilings, 7 for exterior walls and 6 for fences, with 2 coats. They are not prescribed values. Use your product label and surface conditions. No costs or can counts are calculated. Inputs stay in your browser.
Calculate
Ceiling = length × width. Exterior = 2 × (length + width) × height − openings. Fence = length × height × sides. Litres = area ÷ coverage × coats.
Coats
Length/width: 0.000001–10,000 m; height: 0.000001–1,000 m; coverage: 0.000001–1,000 m²/L; coats: whole numbers 1–20. Openings: 0–40,000,000 m² and smaller than wall area.
GOOD TO KNOW
Common questions
Coverage per litre (m²/L)
Are the defaults recommendations? No. They are editable examples; confirm coverage and coats for your product.