Paint Calculator Cost
A paint project's total cost is paint, primer, supplies, and labor added together. This paint calculator cost tool separates each line item so you can compare DIY to pro quotes, switch between interior and exterior scenarios, and see cost per square foot. It uses 2025 Sherwin-Williams, Benjamin Moore, and Behr retail pricing for paint and 2025 contractor rates for labor.
Paint Calculator Cost Formula
Total paint project cost has four components:
- Paint: wall sq ft × coats ÷ coverage (350 interior, 300 exterior) × price per gallon
- Primer (optional): wall sq ft ÷ 300 × $30/gal
- Supplies (DIY only): $60 interior, $100 exterior
- Labor: wall sq ft × labor rate per sq ft
Add them up for the total. Our paint calculator cost tool handles all four at once.
Interior Paint Calculator Cost
Interior paint calculator cost ranges from about $500 (DIY small bedroom) to $15,000+ (pro whole-house premium). The main drivers:
- Wall square footage: typical home sq ft × 3 for 8 ft ceilings
- Coats: 2 standard, 3 for dark-to-light changes
- Paint quality: economy $25/gal, standard $45/gal, premium $70/gal
- Labor: DIY free, pro $1.50-3.50 per sq ft of wall
A 1500 sq ft home interior (about 4,500 sq ft of wall) with standard paint and pro labor runs about $11,000-13,000. DIY the same job for $600-700 in materials.
Exterior Paint Calculator Cost
Exterior paint calculator cost runs higher per square foot than interior because:
- Coverage is lower (300 sq ft/gal instead of 350) - exterior surfaces are more absorbent
- Exterior paint costs about 15% more per gallon
- Labor is higher ($1.50-4.50/sq ft) because of ladder work, scraping, caulking, and weather delays
- Supplies cost more ($100 DIY) because you need extension ladders, drop cloths for landscaping, and more caulk
A 2000 sq ft home exterior costs roughly $4,000-8,000 pro, or $500-800 DIY for paint and supplies.
Cost per Gallon by Paint Quality
| Quality | Brand Examples | Price | Coverage | One-Coat? |
|---|---|---|---|---|
| Economy | Builder Basic, Glidden | $25/gal | 300 sq ft | No |
| Standard | Behr Premium Plus, Valspar Signature | $45/gal | 350 sq ft | Often |
| Premium | Sherwin-Williams Duration, Benjamin Moore Aura | $70/gal | 400 sq ft | Usually |
Premium paint usually saves money when you factor labor. Premium covers in 1 coat vs 2, cutting labor 40-50%. For pro jobs, the labor savings exceed the paint markup by 3-5x.
Cost per Square Foot
Total paint calculator cost per square foot of wall:
- DIY interior: $0.15-0.30 per sq ft (paint only)
- Pro interior: $1.80-4.00 per sq ft (paint + labor)
- DIY exterior: $0.25-0.45 per sq ft
- Pro exterior: $2.00-5.00 per sq ft
Divide your paint project total by wall sq ft (not home sq ft) for this metric.
When to Add Primer
Include primer ($30/gal) when:
- Painting new drywall (seals the paper face)
- Covering dark colors with light (reduces coats from 3 to 2)
- Painting over stains, water damage, or knots in wood
- Switching from oil-based to latex paint
Skip primer when painting the same color over an existing quality coat.
DIY vs Pro Paint Cost
For most homeowners, DIY saves 85-90% of total paint calculator cost. A 1500 sq ft interior:
- DIY: $600-700 total (paint + supplies)
- Pro basic: $8,000-9,000 total
- Pro standard: $11,000-13,000 total
- Pro premium: $15,000-18,000 total (with trim and ceilings)
DIY takes 2-4 weekends for a 1500 sq ft home. Pro takes 3-5 days. The math favors DIY unless you are time-constrained or need heavy drywall repair.