Paint Calculator
Estimate how many gallons of paint you need.
Interactive calculator
Result
Gallons needed
1.4
Paintable area
233
What it is
A gallon of paint covers about 350 sq ft per coat on a smooth wall. Subtract doors and windows from the wall area.
The formula
Gallons = (Wall area − openings) × coats ÷ 350 ft²/gallon
Why it matters
Understanding paint calculator helps you make a better-informed decision before you commit money or time.
Worked examples
Try the example
Use the defaults above as a starting point — then adjust the inputs to match your situation.
Common pitfalls
- Double-check the units on every input — most errors come from mixing units.
- Round at the end, not in the middle of the formula.
Frequently asked questions
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