Interior room paint estimateLive calculation
Painting job calculator
Free paint cost calculator
Calculate in your browser
Enter room dimensions, openings, coats, paint coverage, paint price and labor rates to estimate paintable wall area, gallons and total job cost.
Free, no sign-up, and the entered values stay in your browser.
Formula
How the calculation works
Enter room dimensions, openings, coats, paint coverage, paint price and labor rates to estimate paintable wall area, gallons and total job cost.
Wall area = 2 × (length + width) × height − openings. Gallons = wall area × coats ÷ coverage.Measure each room separately. Paint coverage, surface condition, primer, trim and local labor rates can change the final price.
Use the result
Move from calculation to a customer document.
Confirm the measurements, rates, tax treatment and project scope before relying on an estimate. Keep the calculation with the customer record, then place the verified figures in an itemized estimate, quote or invoice.
These browser calculations support planning and pricing. They do not replace field measurements, supplier quotations, payroll, accounting, tax, lending or professional advice.
Frequently asked questions
Questions about free paint cost calculator
How much wall area does one gallon of paint cover?
Use the coverage shown on the selected product. The example begins at 350 square feet per gallon, but texture, porosity and application method can change coverage.
Does this paint calculator include ceilings and trim?
No. The wall formula covers a rectangular room after subtracting entered openings. Calculate ceilings, doors, trim and exterior surfaces separately.
Can painters use the result in an estimate?
Yes. Confirm measurements and product requirements, then add the material and labor figures to an itemized customer estimate.
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