Paint coverage calculator
Four-wall room shell. We paint two long walls + two short walls using room length, width and ceiling height. Deduct square feet is one lump for doors, windows and big openings you are not coating. Coverage per gallon is your product data sheet defaulting to a common 350 ft²/gal planning number — change it.
Gross wall area416 sq ft
After deduct336 sq ft
Gallons (single coat math)0.96 gal
Second coat: multiply gallons or halve coverage number in your head — we do not auto-double.
Key takeaways
- Single-coat honesty in the footer.
- Deduct field handles doors/windows lump sum.
- Coverage per gallon fully editable.
- Pairs with QuoteIQ material lists after you pick SKU.
- Runs offline after load.
Who built this
ContractorHQ is edited by Bernard Guido — 25+ years in trade operations and software. These utilities follow the same quality bar as our reviews: fast pages, honest disclosure, and tools that stay useful without selling your data.
Frequently asked questions
Ceiling included?
Not by default — only the four vertical walls. Add ceiling square feet mentally into the deduct field as a negative deduct hack? Better: measure ceiling separately and add to gross in a spreadsheet.
Primer different coverage?
Change the coverage field when you switch products.
Spray vs brush?
Overspray changes real gallons; this is brush/roll planning math only.
Trim?
Not separated — either lowball the deduct or add a second worksheet line for base trim LF.