Estimate paint for a room
You are painting the four walls of a rectangular room. Subtract doors and windows, choose a coat count, and estimate the paint volume.
Your experiment
Change any value to update the result. Use the stated units.
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Why it works
litres = [2(length + width) × height − openings] × coats / coverage
Assumptions and limits
Walls only: ceiling excluded. Flat rectangular walls, full coats and stated coverage. Texture, spills and product instructions can increase the quantity. Round up when choosing actual tins.