Paint Calculator Cost

How We Calculate Your Paint Costs

The total cost of your paint project comes down to four basic components:

• Paint: We calculate this by multiplying your wall square footage by your desired number of coats. We then divide that number by the standard coverage rate (350 for interior, 300 for exterior) and multiply by the price per gallon.
• Primer: If your walls need primer, we divide your total wall area by 300 and multiply by the standard $30 per gallon rate.
• Supplies: We estimate $60 for basic interior supplies and $100 for exterior tools for DIY projects.
• Labor: We multiply your wall square footage by current professional labor rates to give you an accurate contractor estimate.

Estimating Interior Paint Costs

Interior painting costs range from about $500 for a simple DIY bedroom project to well over $15,000 for a professional, whole-house premium job. Your total depends heavily on your wall square footage, the number of coats required, the quality of paint you select, and whether you hire a professional.

For example, painting the interior of a 1,500-square-foot home with standard paint costs about $11,000 to $13,000 if you hire a professional crew. If you tackle the exact same job yourself, you will only spend $600 to $700 on materials.

Estimating Exterior Paint Costs

Exterior painting generally costs more per square foot than interior work. Exterior surfaces absorb more moisture, which drops the typical coverage rate to roughly 300 square feet per gallon. Exterior paint also costs about 15% more per gallon than interior formulas.

Professional labor rates also increase to $1.50 to $4.50 per square foot. Exterior work requires tall ladders, heavy scraping, extensive caulking, and built-in buffer time for weather delays. A typical 2,000-square-foot home exterior costs between $4,000 and $8,000 for professional painting, or $500 to $800 if you buy the supplies and do it yourself.

Understanding Paint Quality and Prices

• Economy ($25 per gallon): This basic builder-grade paint covers about 300 square feet. It rarely finishes the job in one coat.
• Standard ($45 per gallon): Reliable options like Behr Premium Plus or Valspar Signature cover 350 square feet and provide solid performance.
• Premium ($70 per gallon): High-end paints like Sherwin-Williams Duration or Benjamin Moore Aura cover up to 400 square feet.

Buying premium paint often saves you money in the long run. Because premium paint typically requires just one coat, it cuts your required labor time in half. For professional jobs, the massive savings on labor easily offset the higher price tag on the paint itself.

Average Cost Per Square Foot

When calculating these metrics, always divide your total project cost by the actual wall square footage you plan to paint, rather than your home's total floor plan size.

• DIY Interior: $0.15 to $0.30 per square foot (paint only).
• Professional Interior: $1.80 to $4.00 per square foot (paint and labor).
• DIY Exterior: $0.25 to $0.45 per square foot (paint only).
• Professional Exterior: $2.00 to $5.00 per square foot (paint and labor).

When Do You Need Primer?

You should budget for primer (around $30 per gallon) if you plan to paint over bare drywall, cover a dark wall with a light color, block out severe water stains or wood knots, or transition from an oil-based paint to a latex paint. You can usually skip the primer if you are applying a fresh coat of the exact same color over high-quality existing paint.

DIY vs. Hiring a Professional

Doing the work yourself saves you 85% to 90% of the total project cost. For a standard 1,500-square-foot interior, a DIY approach costs roughly $600 to $700. Hiring a professional for the same space ranges from $8,000 for a basic job up to $18,000 for a premium finish that includes ceilings and detailed trim work.

The decision usually comes down to your available free time. A DIY project of this size takes two to four weekends of hard work, while an experienced professional crew finishes the job in just three to five days.