Paint Calculator
Calculate exactly how much paint you need for any room. Includes windows, doors, number of coats, and cost estimation.
Enter Room Dimensions
Most rooms need 2 coats. Dark colors may need 3.
Standard latex paint covers 350–400 sq ft per gallon
Results
Enter your room dimensions and click Calculate to see results.
How to Use This Calculator
- 1Enter your room dimensions — length, width, and ceiling height.
- 2Specify the number of windows and doors to subtract from the wall area.
- 3Choose the number of coats (2 is standard for most projects).
- 4Click Calculate to see wall area, paint needed in gallons, and estimated cost.
Related Painting Guides
How to Calculate Paint Needed
Learn how to calculate exactly how much paint you need for any room, including walls, ceilings, and trim.
Interior vs Exterior Paint Guide
Understand the differences between interior and exterior paints and how to choose the right type for your project.
Paint Coverage per Gallon Guide
Learn how much area a gallon of paint covers and what factors affect paint coverage rates.
This calculator provides estimates only. Actual materials needed may vary based on specific project conditions. Always consult a professional for critical projects.