Painting Cost Calculator: Estimate Interior and Exterior Jobs in 2026
A free painting cost calculator for contractors and homeowners, with 2026 labor rates, paint coverage math, and the prep factors that swing a quote by thousands.
Enter your room dimensions, prep level, and your own rates. The calculator works out wall and ceiling area, labor hours, paint needed, and a quotable price with your markup applied.
Painting Cost Calculator
Enter room dimensions and your rates. Everything recalculates as you type.
The room
Your rates
Quote this job at
$489
1.00 per sq ft · $113 gross profit
| Wall area | 344 sq ft |
| Ceiling area | 144 sq ft |
| Labor hours | 5.9 hrs |
| Paint needed | 3 gal |
| Materials | $170 |
| Labor | $206 |
| Your cost | $376 |
Production rates assume 250 sq ft/hr on walls and 175 sq ft/hr on ceilings, 350 sq ft coverage per gallon, and 1.5 hours setup and cleanup. Adjust your labor rate to match your crew's actual speed.
Most painting calculators online give you a paint quantity and stop there. That’s the easy half. The hard half is labor, and labor is 70-85% of what a painting job actually costs. Below is how the math works, so you can check the output rather than trusting it blindly.
How the calculation works
Every painting price comes down to the same structure:
Price = (Materials + Labor) × (1 + Markup%)Wall area is perimeter × ceiling height, minus roughly 20 sq ft per door or window. A 12×12 room with 8-foot ceilings gives you 48 ft of perimeter × 8 ft = 384 sq ft gross, minus two openings = 344 sq ft of actual wall.
Ceiling area is just length × width. In that same room, 144 sq ft.
Labor hours come from production rates. A painter covers roughly 250 sq ft/hour on walls with a roller and 175 sq ft/hour on ceilings, which are slower because you’re working overhead and cutting in around fixtures. Multiply area by coats, divide by the rate, then add setup and cleanup.
Paint quantity is (area × coats) ÷ 350 sq ft per gallon, rounded up. Coverage varies by product — flat covers better than semi-gloss, and a cheap paint may only stretch to 300 sq ft.
Markup goes on top of materials and labor combined. Most painting contractors run 20-35%.
Markup is not margin
A 30% markup on $300 of cost gives you $390 and a 23% margin. If you want a 30% margin you need a 43% markup. Contractors lose real money on this every year — the full breakdown is here.
2026 painting rates
Where jobs land per square foot this year:
| Scope | Per sq ft |
|---|---|
| Interior walls only | $1.50 – $4.00 |
| Interior walls + ceiling | $2.75 – $6.00 |
| Full room (walls, ceiling, trim, doors) | $4.00 – $8.00 |
| Exterior siding | $2.00 – $5.50 |
| Exterior trim (per linear ft) | $1.00 – $3.50 |
| Decks and fences | $2.50 – $6.00 |
| Cabinet refinishing (per door) | $75 – $200 |
Labor rates: apprentice or helper at $15-25/hour, journeyman painter at $25-50/hour, lead or master painter at $40-75/hour.
Paint prices per gallon: builder-grade at $20-30, mid-range at $35-55, premium at $60-95, specialty and cabinet-grade at $70-140.
The four things that move the price most
Square footage tells you less than people expect. These four factors explain most of the variance between two jobs of the same size.
Prep work is the biggest swing, and it’s the one that gets eyeballed most often. Light prep — clean walls, a few nail holes — adds almost nothing. Moderate prep with patching, sanding, and spot-priming adds about 25% to labor hours. Heavy prep with wallpaper removal or major drywall repair adds 60% or more. On a whole-house interior, that difference is thousands of dollars.
Coats matter more than they sound like they should. Two coats covers most repaints. Dark-to-light color changes, new drywall, and uneven surfaces need three, and the third coat is a full extra pass of labor — not a touch-up.
Access and complexity never show up in square footage. Vaulted ceilings, stairwells, tight closets, and rooms full of furniture all slow the work down without adding any area. If you use a square-foot rate without adjusting for these, the complicated rooms silently fund the simple ones.
Trim and doors carry disproportionate labor. Trim is slow, detailed brushwork, and doors run 30-60 minutes each for a proper job. That’s why full-room pricing runs $4-8/sq ft while walls-only runs $1.50-4.00 in the same room.
Worked example: 12×12 bedroom
Walls and ceiling, 8-foot ceilings, standard prep, two coats, mid-range paint.
- Wall area: 48 ft perimeter × 8 ft = 384 sq ft, minus 40 sq ft for a door and window = 344 sq ft
- Ceiling: 12 × 12 = 144 sq ft
- Wall labor: (344 × 2) ÷ 250 = 2.75 hours
- Ceiling labor: (144 × 2) ÷ 175 = 1.65 hours
- Setup and cleanup: 1.5 hours
- Total: 5.9 hours
- Paint: (344 × 2) ÷ 350 = 2 gallons wall, 1 gallon ceiling = 3 gallons at $45 = $135
- Sundries (tape, plastic, caulk): $35
- Materials: $170
- Labor at $35/hour: $207
- Cost: $377, plus 30% markup = $490
Divided across 488 sq ft of painted surface, that’s $1.00 per square foot — well below the $2.75-6.00 band for walls-and-ceiling work.
That gap is worth understanding, because it’s the most useful thing in this article. The published per-square-foot bands reflect what customers pay in the market, and they bake in a much higher effective labor rate than $35/hour. A one-person operation charging $35/hour of labor plus 30% is pricing at journeyman wage plus overhead, not at market. If your calculated number keeps landing far under the band, your labor rate is the thing to look at.
Reading the band check
The calculator flags whether your result falls inside the normal market range. Landing below it usually means one of three things: your labor rate is set to a wage rather than a billable rate, you’ve under-scoped prep, or your markup doesn’t cover overhead. Landing above it is usually legitimate on heavy-prep or high-end work — but it’s worth being able to explain why when the customer asks.
Where painters lose money
Quoting from memory instead of measuring. A room that “looks like the last one” is regularly 20% larger. Five minutes with a laser measure pays for itself many times over.
Not budgeting prep separately. Prep can be a third of total hours. If it’s rolled into a general impression of the job, it comes out of profit.
Using last season’s paint prices. Material costs move. A number you were confident about in spring can be underwater by fall.
One flat rate for every job. The vaulted-ceiling job and the empty-8-foot-box job are not the same job, even at identical square footage.
Forgetting markup entirely. Materials plus labor is your cost. Quote it as your price and the first callback erases the job’s profit.
FAQ
How much does it cost to paint a room?
A standard 12×12 bedroom with walls and ceiling runs $400 to $900 for professional interior painting in 2026, depending on prep, coats, and local labor rates. Walls only runs $250 to $600. A full room including trim and doors runs $700 to $1,400.
How do you calculate painting cost per square foot?
Add materials and labor, apply your markup, then divide by the painted surface area. Materials come from (area × coats) ÷ 350 sq ft per gallon. Labor comes from area ÷ production rate — roughly 250 sq ft/hour on walls, 175 on ceilings — plus prep and setup time.
How much paint do I need for a 12x12 room?
About 2 gallons for two coats on the walls of a 12×12 room with 8-foot ceilings, plus 1 gallon for the ceiling. That assumes 350 sq ft of coverage per gallon, which is standard for mid-range interior paint. Cheaper paint and heavily textured surfaces both reduce coverage.
How much do painters charge per hour?
Helpers and apprentices run $15-25 per hour, journeyman painters run $25-50, and lead or master painters run $40-75. Contractors quoting a job price rather than an hourly rate typically build in a higher effective rate to cover overhead, insurance, and non-billable time.
Is it cheaper to paint walls only or the whole room?
Walls only runs $1.50-4.00 per square foot, while a full room with ceiling, trim, and doors runs $4.00-8.00. Trim and doors carry most of that difference because they’re slow, detailed brushwork rather than fast roller work.
How much should I add for prep work?
Light prep adds little to nothing. Moderate prep with patching and spot-priming adds roughly 25% to labor hours. Heavy prep like wallpaper removal or major drywall repair adds 60% or more, and is usually worth breaking out as its own line item so the customer understands the price.
The short version
Measure the room, calculate labor from real production rates, price paint at what it costs today, then add markup on top. Check the result against the market band for that scope — if it’s far below, your labor rate is probably set at wage rather than at what you need to bill.
The calculator above handles the arithmetic. The judgment about prep level, access, and coats is still yours, and that’s where the accuracy actually comes from.
SnapScope measures rooms from job site photos and prices them against your labor rate and markup, so you can hand a homeowner a real number before you leave the driveway.
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For the full rate breakdown with production speeds and quick-reference job prices, see the painting pricing guide, or read how to price a painting job per square foot.