CALCULATORPRIMER-CALCULATORCALCULATE · DECIDE · ACT
Drywall & Paint Calculators · reviewed September 1, 2026
Primer Calculator
Estimate primer gallons from surface square footage, number of coats, and the primer’s rated coverage.
Ready.
Enter your measurements and calculate.
Enter your measurements and calculate.
Worked example
Example
1,000 sq ft at 250 sq ft/gal requires four gallons for one coat.
References
Sources & assumptions
Last reviewed September 1, 2026. Defaults are starting points; product-specific inputs are editable wherever coverage varies.
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Related tools
FAQ
Common questions
Does primer cover as much as paint?
Often not. Product coverage varies.
Should new drywall be primed?
Follow the paint-system and substrate recommendations for your project.
Can I enter two coats?
Yes.
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Take this number one step further
Use the result as an input to a decision model that compares the next action rather than stopping at the calculation.