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Free interior painting cost calculator. Calculate paint, labor, and total costs for interior painting. Get accurate estimates per square foot. Our calculator uses professional painting standards to estimate paint quantities, material costs, labor hours, and total project expenses based on room dimensions, paint quality, and finishing options.
Last updated: February 2, 2026
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Wall Area
360 sq ft
Ceiling Area
180 sq ft
Total Paintable Area:
540 sq ft
Paint Needed:
4 gallons
Primer Needed:
2 gallons
Est. Time:
8.2 hours
Cost per sq ft:
$1.3
Painting Tips:
Cost breakdown
Paint + Labor + Supplies
Complete cost analysis for budgeting interior painting projects
Paint quantity
Gallons Needed
Calculates paint and primer based on coverage rates
Price per sq ft
$/sq ft Analysis
Compare pricing and estimate by square footage
Room-by-room
Per Room Estimate
Detailed estimates for bedrooms, living rooms, and more
Surface options
Walls + Ceiling + Trim
Separate calculations for different surfaces
Time estimate
Hours × Rate
Calculate labor hours and professional painting costs
For a 15ft × 12ft room with 8ft ceilings, standard paint, 2 coats:
Total Area
540 sq ft
Paint Needed
4 gal
Total Cost
$702.57
Cost/sq ft
$1.3
Our interior painting cost calculator uses professional painting industry standards to estimate paint quantities, material costs, and labor expenses. The calculation accounts for room dimensions, door and window openings, paint quality, number of coats, and professional painter hourly rates to provide accurate budget estimates for your interior painting project.
Wall Area = 2(L × H) + 2(W × H) - OpeningsPaint Gallons = (Total Area × Coats) ÷ 350Labor Hours = (Total Area × Coats) ÷ 175 + PrepTotal Cost = Paint + Supplies + (Hours × Rate)Cost per Sq Ft = Total Cost ÷ Total AreaThese formulas calculate paintable wall area by measuring all walls and subtracting door/window openings. Paint coverage averages 350 sq ft per gallon per coat. Professional painters cover approximately 175 sq ft per hour including prep work. Total costs include paint, primer, supplies (brushes, rollers, tape), and labor.
Shows wall layout with door/window openings and paintable surfaces
Professional interior painting follows specific standards for quality results. Proper surface preparation includes cleaning, patching holes, and priming when needed. Two coats of paint provide optimal coverage and durability. Paint quality affects both coverage rate and longevity, with premium paints requiring fewer coats but costing more upfront.
Need help with other home improvement projects? Check out our drywall calculator and board and batten calculator.
Get Custom Calculator for Your PlatformResult: 4 gallons paint + supplies + labor = $702.57 total
Estimated time: 8.2 hours • Cost per sq ft: $1.3
10ft × 10ft room, walls only, basic paint
$300-500 total cost
20ft × 18ft living room, premium paint
$1,200-2,000 total cost
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Suggested hashtags: #InteriorPainting #HomeImprovement #Painting #DIY #Calculator