Cost Estimator

Interior Painting Cost Calculator - Interior Paint Cost Estimator & Calculator

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: December 15, 2024

Accurate paint quantity calculations
Multiple paint quality options
Complete cost breakdown with labor

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Interior Painting Calculator
Calculate paint, materials, and labor costs for interior painting

Area Breakdown

Wall Area

360 sq ft

Ceiling Area

180 sq ft

Total Paintable Area:

540 sq ft

Paint Needed:

4 gallons

Primer Needed:

2 gallons

Cost Breakdown

Paint & Primer:$190
Supplies & Materials:$104
Labor Cost:$408.57
Total Cost:$702.57

Est. Time:

8.2 hours

Cost per sq ft:

$1.3

Painting Tips:

  • • Use primer for new drywall or dramatic color changes
  • • Premium paint covers better and lasts longer
  • • Two coats recommended for even coverage
  • • Professional painters: $2-6 per sq ft installed
  • • Remove furniture and protect floors before painting
  • • Allow 2-4 hours drying time between coats

Interior Painting Calculator Types & Features

Interior Paint Cost Calculator
Calculate complete interior painting project costs

Cost breakdown

Paint + Labor + Supplies

Complete cost analysis for budgeting interior painting projects

Paint Estimator Calculator
Estimate gallons of paint needed for your project

Paint quantity

Gallons Needed

Calculates paint and primer based on coverage rates

Cost per Square Foot Calculator
Calculate painting costs per square foot

Price per sq ft

$/sq ft Analysis

Compare pricing and estimate by square footage

Room Painting Cost Calculator
Calculate costs for painting individual rooms

Room-by-room

Per Room Estimate

Detailed estimates for bedrooms, living rooms, and more

Interior Wall Painting Calculator
Calculate costs for walls, ceilings, and trim

Surface options

Walls + Ceiling + Trim

Separate calculations for different surfaces

Painting Labor Cost Calculator
Estimate professional painter labor costs

Time estimate

Hours × Rate

Calculate labor hours and professional painting costs

Quick Example Result

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

How Our Interior Painting Cost Calculator Works

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.

Interior Painting Cost Formulas

Wall Area = 2(L × H) + 2(W × H) - Openings
Paint Gallons = (Total Area × Coats) ÷ 350
Labor Hours = (Total Area × Coats) ÷ 175 + Prep
Total Cost = Paint + Supplies + (Hours × Rate)
Cost per Sq Ft = Total Cost ÷ Total Area

These 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.

🎨 Room Painting Diagram

Shows wall layout with door/window openings and paintable surfaces

Professional Painting Standards

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.

  • Paint coverage: 350-400 sq ft per gallon per coat
  • Primer coverage: 300-350 sq ft per gallon
  • Professional painting rate: 150-200 sq ft per hour
  • Industry standard: 2 coats for even coverage
  • Prep time: 30-45 minutes per room average
  • Drying time: 2-4 hours between coats

Sources & References

  • Painting and Decorating Contractors of America (PDCA) - Professional Painting Standards and GuidelinesIndustry standards for paint application and estimating
  • Master Painters Institute (MPI) - Paint Coverage and Performance StandardsTechnical guidelines for paint coverage rates and quality
  • Sherwin-Williams - Paint Calculator and Coverage GuideLeading paint manufacturer's coverage and estimation tools

Need help with other home improvement projects? Check out our drywall calculator and board and batten calculator.

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Interior Painting Cost Calculator Examples

Interior Paint Cost Calculator Example
Calculate painting costs for a 15ft × 12ft bedroom with standard paint

Room Specifications:

  • Dimensions: 15ft × 12ft × 8ft
  • Doors: 2
  • Windows: 2
  • Paint quality: Standard ($35/gal)
  • Coats: 2
  • Ceiling: Yes

Calculation Steps:

  1. Wall area: 2(15×8) + 2(12×8) = 432 sq ft
  2. Subtract openings: 432 - 72 = 360 sq ft
  3. Ceiling: 15 × 12 = 180 sq ft
  4. Total: 360 + 180 = 540 sq ft
  5. Paint: (540 × 2) ÷ 350 = 4 gallons
  6. Calculate paint, supplies, and labor costs

Result: 4 gallons paint + supplies + labor = $702.57 total

Estimated time: 8.2 hours • Cost per sq ft: $1.3

Small Room Example

10ft × 10ft room, walls only, basic paint

$300-500 total cost

Large Room Example

20ft × 18ft living room, premium paint

$1,200-2,000 total cost

Frequently Asked Questions

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