Paint Calculator — best
Calculate how much paint you need for a room.
Wall area
45.00 m²
Paint needed (L)
9.00 L
Paint needed (gal)
2.38 gal
How to use Paint Calculator
Enter Room Dimensions
Input your room's length, width, and height in feet or meters using the input fields labeled 'Length', 'Width', and 'Height'. The calculator accepts decimal values for precise measurements.
Select Paint Coverage Rate
Choose your paint type from the dropdown menu or enter the coverage rate in square feet per gallon. Standard latex paint covers 350-400 sq ft/gallon; premium paint covers 250-350 sq ft/gallon. The default value is 350 sq ft/gallon.
Specify Number of Coats
Use the 'Number of Coats' selector to choose 1, 2, or 3 coats. Most rooms require 2 coats for even coverage. Select the appropriate number using the radio buttons or dropdown.
Adjust for Windows and Doors
Toggle the 'Include Windows/Doors' checkbox and enter the number of windows and doors. Each window equals approximately 10 sq ft and each door equals 20 sq ft. The calculator automatically deducts these areas.
View Your Paint Estimate
Click the 'Calculate' button to instantly see results displayed in the 'Results' panel. View total square footage, gallons needed, and cost estimate if you entered your paint price per gallon.