Paint Calculator - Free Online Tool
Professional-grade paint calculator calculator for accurate material estimation. Get instant results with industry-standard formulas and proper wastage allowances.
Calculate Your Paint Calculator Requirements
Length of the room
Width of the room
Height from floor to ceiling
Standard doors are about 20 sq ft each
Average windows are about 15 sq ft each
Check if you plan to paint the ceiling
Your Calculation Results
Enter your measurements above to see calculation results here.
Results will update automatically as you type.
How the Paint Calculator Calculation Works
Paint coverage is calculated based on surface area minus doors and windows, divided by paint coverage rate per gallon.
Formula:
Paint Needed = (Total Surface Area - Doors/Windows) ÷ Coverage per GallonMost quality paints cover 350-400 sq ft per gallon. We use 350 sq ft for conservative estimates and account for surface texture.
Example Calculation
Real-World Scenario:
Painting a room that is 12 ft × 10 ft with 9 ft ceilings, with one door and two windows.