Avoid multiple trips to the hardware store with our precise Paint Calculator. Input your room dimensions and specify the number of doors and windows to subtract non-painted surfaces. The tool uses standard coverage rates (approx. 350-400 sq ft per gallon) to give you a reliable purchase estimate.
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Paint Calculator
Estimate how much paint you need for your walls.
Room Dimensions
Estimated Paint Needed
Gallons Needed
2
Exact: 1.62 gal
Total Area
568.0 sq ft
Includes 2 coats
In Liters
6.14 L
Buying Guide
We recommend rounding up to the nearest gallon to ensure you have enough for touch-ups. Calculations assume ~350 sq ft coverage per gallon.
Wall & Ceiling Paint Estimator
Calculate how many gallons of paint you need for any room. Account for doors, windows, and multiple coats.
1
Enter Dimensions
Enter the width and height of all walls in the room.
2
Subtract Features
Enter the number of standard doors and windows.
3
Calculate
Set the number of coats to see your total gallon requirement.
Key Features
Subsurface Subtraction
Automatically removes door and window area from the total.
Multiple Coats
Adjust based on whether you're doing one, two, or three coats of paint.
Ceiling Support
Toggleable option to include ceiling area in the calculation.
Frequently Asked Questions
A standard gallon of paint typically covers around 350 to 400 square feet.
Textured or porous surfaces (like new drywall) absorb more paint. Add 10% to the result for these surfaces.
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