Home made clearer
Buy enough paint for the room.
Use room size, coats, openings, and your paint's label coverage for a clear estimate.
Your room
ft
ft
ft
coats
Openings and paint details
doors
windows
sq ft
%
Formula
Wall area = 2 × (room length + room width) × wall height. We subtract 20 sq ft for each door and 15 sq ft for each window, multiply by coats and your waste allowance, then divide by the coverage printed on your paint label. The result rounds up to whole gallons.
References
- Sherwin-Williams: how to calculate wall area and openings
- Benjamin Moore: paint coverage and room example
Coverage varies by product and surface. Check the selected product's label before buying.