Paint Calculator
Estimate gallons of paint needed using wall area, coverage per gallon, and number of coats.
Use Paint Calculator
How to use this tool
- Enter or select the required input.
- Choose any options that apply to your task.
- Run the tool and review the result before downloading or copying it.
Inputs stay in this browser. Core processing stays in your browser; continued use may require a free account depending on access settings.
About Paint Calculator
Estimate gallons of paint needed using wall area, coverage per gallon, and number of coats with a focused online interface designed to help you complete this task quickly on Costovia.
How to use Paint Calculator
- Enter the project measurements or cost assumptions requested by the calculator.
- Adjust optional rates, quantities or waste factors to match your situation.
- Run the calculation and review the estimate before budgeting or requesting quotes.
Example
Example: enter your own values for a real scenario and use Paint Calculator to estimate gallons of paint needed using wall area, coverage per gallon, and number of coats. Change one assumption at a time to see how the result changes.
What to check
Results are estimates based on the values you enter and may not reflect local labor, tax, permit, material or market conditions.
Frequently asked questions
What does Paint Calculator do?
Estimate gallons of paint needed using wall area, coverage per gallon, and number of coats.
How do I use the paint calculator?
Enter the values, text or files requested by Paint Calculator, choose any relevant options, run the tool, and review the result before copying or downloading it.
Is this result guaranteed for professional decisions?
No. The tool uses the inputs you provide. Verify important financial, legal, medical, technical or professional decisions with an authoritative source.
Related tools
Paint coverage and gallon planning
The calculator uses paintable area, coverage per gallon and the number of coats. The transparent relationship is area × coats ÷ coverage per gallon, rounded to a practical purchase quantity where the tool indicates.
Improve the estimate
- Subtract doors, windows or areas that will not be painted when appropriate.
- Use the coverage rate shown by the actual paint manufacturer for the surface and application method.
- Increase the number of coats when primer, color change or porous surfaces require it.
Worked example
For 1,200 sq ft, two coats and 350 sq ft of coverage per gallon, the raw calculation is about 6.86 gallons before project-specific allowances.
References and safety
General coatings information is available from the American Coatings Association. For renovation work that may disturb lead-based paint, review the U.S. EPA Renovation, Repair and Painting Program.
Reviewed 30 September 2026. Always follow the product label and local safety requirements.