Interior Painting Cost Calculator
Estimate the total cost of painting a room including paint, labor, and supplies.
Published by:
isCalculator Editorial Team
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How to use this tool?
This calculator estimates the total cost of painting a rectangular room based on its dimensions, number of windows/doors, coats, and material/labor rates. All measurements are in feet and US dollars.
- Enter Room Dimensions – Provide the room’s length, width, and height in feet (e.g., 12, 10, 8).
- Specify Openings – Enter the number of windows and doors (these subtract area).
- Set Painting Details – Choose the number of coats (at least 1) and the paint cost per gallon.
- Add Labor & Supplies – Enter the labor rate per square foot and a fixed supplies cost.
- Click “Calculate Cost” – The form validates inputs and shows a breakdown of paint, labor, supplies, and total cost.
Note: All inputs must be positive numbers (non-negative for windows, doors, and costs). The calculator assumes standard window (15 sq ft) and door (21 sq ft) sizes, and one gallon covers 350 sq ft per coat.
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Frequently Asked Questions
Measure the length, width, and height of the room in feet. Include windows and doors to subtract their area.
One gallon of paint typically covers 350 square feet with one coat. Our calculator uses this standard.
This calculator is for a single room. For multiple rooms, calculate each separately and sum the totals.