Painting Estimate Calculator

Build Accurate Painting Estimates in Seconds

Painting estimates that are too low cut into your margins. Estimates that are too high lose you the job. This calculator helps you find the right number based on real project dimensions, your actual paint cost, and your labor rate.

How the Calculator Works

Interior wall area — Enter the total paintable wall surface in square feet. This is not the floor area — it’s the actual wall space. For a standard room, multiply perimeter by ceiling height and subtract doors and windows.

Number of coats — Most interior repaints require 2 coats. New drywall or dramatic color changes may need 3.

Exterior perimeter — Enter the linear footage around the building’s exterior. The calculator assumes a standard 9-foot wall height with a 20% waste factor for trim, corners, and overlaps.

Paint cost per gallon — Use your actual supplier cost. Premium paints run $45–$75/gallon; standard grades $25–$45/gallon.

Labor rate — Your burdened hourly rate including all employee costs, or your own target billable rate.

Paint Coverage Standards

This calculator uses 350 square feet per gallon as the coverage rate — a conservative industry standard that accounts for typical surface texture and brush/roller absorption. Smoother surfaces may yield 400 sqft/gallon; rough or porous surfaces may need more.

What to Add to Your Quote

This calculator covers paint and direct labor. Your final client quote should also include:

• Prep work (patching, sanding, taping, masking)
• Primer if needed
• Cleanup and disposal
• Travel / mobilization
• Your margin

Add these as line items in your quoting software for a complete, professional estimate.