How it works
A walkthrough, end to end.
- 1
Enter room perimeter and ceiling height.
- 2
Subtract door and window area.
- 3
Pick coverage per gallon and number of coats.
Reference
Paint coverage
Gallons = (paintable area × coats) / coverage per gallon. Standard coverage ≈ 350 sq ft/gal.
Use cases
What you can do with this.
Single room
Living room or bedroom.
Whole house
Sum each room's gallons.
Repaint planning
Two coats for color change.
Trim & ceilings
Compute separately with smaller coverage.
Rental turn
Quickly estimate touch-up gallons.
FAQ
Frequently asked.
Most paints cover 350 sq ft per gallon (1 coat, smooth surface). Textured walls cover less.
Subtract their area to avoid over-buying.
No. All math runs in your browser.
Add a primer coat for new drywall or color change.