Interior House Painting Cost Calculator: Estimate Your Project

Want to estimate your interior painting costs before getting quotes? This guide gives you the formulas and factors to calculate a realistic budget for your project.

Basic Cost Formula

Total Cost = Wall Square Footage × Cost Per Sq Ft

But there's more to it. Let's break it down step by step.

Step 1: Calculate Your Wall Square Footage

For Each Room:

Wall Area = (Room Length + Room Width) × 2 × Wall Height

Then subtract:

• Windows: ~15 sq ft each
• Doors: ~20 sq ft each

  Example: 12x14 Bedroom, 9' Ceilings

  - Perimeter: (12 + 14) × 2 = 52 feet

• Wall area: 52 × 9 = 468 sq ft
• Minus 1 window (-15) and 1 door (-20)
• Paintable area: 433 sq ft

  Quick Reference: Common Room Sizes

  Step 2: Choose Your Price Point

  Price Per Square Foot Guide

Step 3: Add-Ons and Extras

Trim Work

Specialty Items

Step 4: Calculate Your Total

Formula:

Total = (Wall Sq Ft × Base Rate) + Ceiling + Trim + Extras

Example Calculation

3-Bedroom, 2-Bath Home (1,500 sq ft)

Add-ons:

• Ceilings: +$2,400
• Baseboards (200 LF): +$300
• Grand Total: ~$11,640

  Realistic range: $8,000 - $14,000

  Room-by-Room Cost Calculator

  Bedroom Costs

  Bathroom Costs

  Living Areas

  Factors That Increase Costs

  Add 15-25% for:

• High ceilings (10-12 feet)
• Extensive wall repairs
• Dark to light color changes
• Multiple accent walls

  Add 25-40% for:

• Very high ceilings (12+ feet)
• Significant damage
• Textured ceilings
• Premium paint products

  Add 40-60% for:

• Cathedral ceilings
• Major renovations
• Specialty finishes
• Lead paint remediation

  Factors That Reduce Costs

  Save 10-15%:

• Off-season booking (winter)
• Minimal color changes
• Empty home (no furniture moving)
• Bundle multiple rooms

  Save 15-25%:

• Builder-grade paint
• Walls only (no ceiling/trim)
• Simple prep needs
• Cash payment (some contractors)

  DIY vs. Professional Cost Comparison

  DIY Materials Only

Professional (Labor + Materials)

When to Get Professional Quotes

Use these estimates to:

Set a realistic budget

Understand pricing ranges

Identify outlier quotes

Plan your project

But always get professional quotes for:

• Accurate room measurements
• Wall condition assessment
• Paint recommendations
• True project timeline

  Get Your Accurate Quote

  Ready to move from estimates to exact pricing? Pro House Painters provides free, detailed quotes including:

  - Professional room measurements

• Wall condition assessment
• Paint brand recommendations
• Complete pricing breakdown
• Accurate timeline

  Call (860) 926-3009 for your free in-home estimate!