Painting · US pricing
Interior Painting Estimate Calculator
Measure paintable wall area, round paint quantities to whole gallons, and compare one, two, and three coats.
Job assumptions
Replace the example inputs with your actual costs. Results update as you edit.
Estimate and analysis
A share link includes the prices and assumptions you entered.
Create faster painting quotes with custom software
Connect your painting quotes, job schedules, and customer follow-ups in one workflow.
Explore Custom Software ↗How many gallons of paint should a contractor include in a bid?
Multiply the perimeter by wall height and room count, subtract opening area, then multiply by coats and the waste factor. Divide by paint coverage and round the final quantity up.
Worked example
A 12-by-14-foot room with eight-foot walls has 416 square feet of wall area. Subtract 36 square feet of openings. Two coats with 10% waste need 836 square feet of coverage. At 350 square feet per gallon, budget three gallons.
How this calculator works
- Choose the scope and enter your unit costs, crew or schedule assumptions.
- Read the estimated costs and the result based on the inputs above.
- Compare scenarios before copying or printing your estimate.
Group rooms with similar dimensions or calculate separate quotes for different rooms. Use coverage from the product label and adjust for rough walls or a major color change. Preparation time is charged once.
Last reviewed: November 12, 2026 · Deepak Softech
Frequently asked questions
Does this include ceilings and trim?
The wall calculation does not include ceilings or trim. Include additional labor and materials separately if they are in scope.
Why round up after multiplying by coats?
The same paint can cover several walls. Rounding the total avoids overstating gallons by rounding every wall separately.
Related pricing calculators
Plumbing Job Estimate Calculator
Price a plumbing job with labor, materials, permits, overhead, and contingency. Check what happens if the job runs long.
Open Free Tool
Pressure Washing Pricing Calculator
Build a driveway, patio, or exterior washing quote with productivity, setup time, operating costs, and a minimum service fee.
Open Free Tool
Mobile Car Detailing Pricing Calculator
Compare three detailing packages by profit per labor hour, including add-on revenue and delivery costs.
Open Free ToolFree Tool by Deepak Softech · Browse all tools