Paint Calculator
Calculate how much paint you need for a room
Measurements
What is Paint Calculator?
The Paint Calculator estimates how many gallons or liters of paint you need based on room dimensions. It accounts for doors, windows, and the number of coats, so you buy the right amount without waste or shortage.
How to use
- Enter the room dimensions: length, width, and wall height.
- Specify the number of doors and windows to subtract their area from the paintable surface.
- Choose the number of coats and paint coverage rate, then view the total paint needed in gallons or liters.
Result
A room is 12 ft x 14 ft with 8 ft ceilings, 2 doors, and 3 windows. Total wall area is 416 sq ft minus ~77 sq ft for openings = 339 sq ft. At 350 sq ft per gallon with 2 coats, you need about 2 gallons.