Paint Calculator

Enter your details below and get instant results

Enter the room length (ft) to calculate
Enter the room width (ft) to calculate
Enter the room height (ft) to calculate
Enter the number of windows to calculate
Enter the number of doors to calculate
Enter the number of coats to calculate
Enter the coverage (sq ft per gallon) to calculate

Paint Calculator

Our Paint Calculator helps you estimate the amount of paint needed for any room. Enter your room dimensions, number of windows and doors, and number of coats to get accurate paint quantity estimates.

How to Use

  • Enter room length and width
  • Enter room height
  • Enter number of windows and doors
  • Enter number of coats
  • Select paint coverage per gallon
  • Click Calculate to see paint needed
Lifestyle 2 views Updated: Jul 2026

Formula

Gallons = (Wall Area - (Window Area×Windows + Door Area×Doors)) × Coats / Coverage

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