Paint Calculator
Calculate how many gallons of paint you need for a room. Accounts for doors, windows, and multiple coats.
InputsLive
ft
ft
ft
Results
Gallons Needed
3
Exact Gallons2.24
Paintable Area392 sq ft
Total Wall Area432 sq ft
Estimated Cost$120.00
How to Use This Calculator
- Enter the room length and width in feet to calculate the wall perimeter.
- Set the wall height in feet (standard rooms are 8 ft).
- Enter the number of coats — 2 is typical for most paint jobs.
- Optionally enter the number of doors and windows to subtract unpaintable area (~20 sq ft each).
- Read the gallons needed and estimated cost based on your cost-per-gallon input.
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