Paint Cost Estimator
Estimate total paint cost for a room or house
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Paint Cost Estimator helps you estimate total paint cost for a room or house without a spreadsheet. Type Total Sq Ft, Gallons Needed and Price per Gallon ($) into Paint Cost; each keystroke re-runs the math. Paint Cost displays each intermediate figure as well. Paint Cost shines when speed matters. Paint Cost runs in your browser. Home & Garden data stays in the tab. Paint Cost sits in the Home & Garden section next to free online paint cost estimator and room painting cost. Paint Cost is designed for real people. Labels stay plain. Start with Paint Cost; the first number takes seconds.
What the defaults give
Three gallons at $40 each plus primer comes to $174 for DIY.
Hiring the same job at 12 hours and $30 an hour makes it $534, so the labour is $360 of the total.
The arithmetic
Paint = gallons × price per gallon
Primer = gallons × 0.75 × price × 0.6
DIY total = paint + primer
Hired total = DIY total + hours × rate
Paint: 3 × $40 = $120. Primer: 3 × 0.75 × $40 × 0.6 = $54. DIY = $174. Labour: 12 × $30 = $360, so hired = $534.
Worked examples
3 gal at $40, 12 h at $30 → DIY $174, hired $534
2 gal at $50, 8 h at $40 → DIY $145, hired $465
5 gal at $35, 16 h at $30 → DIY $289, hired $769
3 gal at $40 with no primer → DIY $120, hired $480
1 gal at $60, 4 h at $35 → DIY $87, hired $227
Why the primer estimate is a percentage
Primer is usually applied thinner than a topcoat and costs less per gallon, so the model takes three quarters of the paint quantity at 60% of the price. It is a planning figure, not a quote: bare drywall, a colour change from dark to light, or a patched wall can need a full primer coat at close to the topcoat rate, while repainting a similar colour may need none.
What is not in the number
- Preparation. Filling, sanding and masking are usually the largest slice of labour and are counted here only as part of the hours.
- Supplies. Rollers, trays, tape and drop sheets add a fixed cost that matters most on small jobs.
- Ceilings and trim. A different product and a different rate, so price them separately.
- Coverage. A gallon covers roughly 350 sq ft in one coat; textured or porous surfaces take more.
- Your own time. Twelve DIY hours have a value even when no invoice is raised, and a rushed job usually costs a second coat.
Compare like with like: the DIY figure is materials only, so the honest comparison is your hours against the $360, not the whole $534.
Frequently Asked Questions
How much does it cost to paint a room?
With three gallons at $40 and primer, materials come to $174; adding 12 hours of labour at $30 brings the total to $534.
How is the primer cost estimated?
As three quarters of the paint quantity at 60% of the paint price — $54 on three gallons at $40.
Is DIY really cheaper?
In cash, yes by the labour charge. The fair comparison is your hours against that labour figure, and it assumes you already own the tools.
How much does a gallon of paint cover?
About 350 square feet in one coat on a smooth surface. Two coats halve that, and textured walls reduce it further.
What does the estimate leave out?
Preparation, tape, rollers, drop sheets, ceilings and trim. Those can add a meaningful amount on a small job.
Why does the hired total not include materials twice?
It does not — the hired figure is the same materials plus labour, so the difference between the two lines is exactly the labour cost.
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