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.
Privacy Protected
Wall & Ceiling Paint Estimator
Calculate how many gallons of paint you need for any room. Account for doors, windows, and multiple coats. Fast, free, and 100% private browser tool.
Share Tool
Select files or drag & drop here
Processed 100% locally in your browser. Your files never touch an external server.
Choose File to Begin
100% Client-Side Privacy•No File Size Limits•Free Forever
About Wall & Ceiling Paint Estimator
FusioFiles 100% Client-Side Privacy Guarantee
Your files and data never leave your browser — processed directly on your device.
Zero Server UploadsExecution occurs entirely in browser memory via WebAssembly and HTML5 Canvas.
HIPAA & GDPR ReadySafe for confidential tax forms, medical records, financial sheets, and legal contracts.
Zero Cloud LatencyInstant results with no upload delays, server queues, or third-party tracking.
Automatic RAM PurgeBuffers and caches are automatically wiped clean the instant you close the tab.
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.
Related Tools
View allLast updated on