ToolwickExterior House Painting Cost Calculator
This house painting cost calculator estimates what it costs to paint the outside of a home: labor, paint, primer, prep and equipment. It works from your house dimensions, siding type and the condition of the existing finish, rounds paint gallons up, and gives a realistic price range instead of a single guess.
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How to Use This House Painting Cost Calculator
Enter the length and width of your house, the number of stories and the wall height of each. Add windows, doors and garage doors so their area is subtracted, then choose your siding, paint condition, paint quality and number of coats. Press Calculate to see the total, a price range, paint gallons to buy, an area breakdown, a cost breakdown and a comparison of every coat and paint-quality combination.
Why This Matters
Exterior painting is one of the largest maintenance jobs a homeowner faces, and quotes vary wildly. For a typical two-story, 2,000-square-foot house, it is common to see bids of $4,000 and $12,000 for what looks like the same job. Without your own baseline number it is hard to tell which bid is fair, which is padded and which skips prep work.
A calculator like this helps in several situations. If you are getting contractor bids, you can check line items against realistic labor and material figures. If you are deciding between DIY and hiring out, you can see how much of the total is labor versus paint and equipment rental. If you are selling, you can budget a fresh exterior coat before listing. And if you are buying paint yourself, an accurate gallon count matters: at $45 a gallon, overbuying by five gallons wastes over $200, while running short mid-wall risks a visible color mismatch between batches. Landlords, property managers and HOA boards use the same math to plan repainting cycles across several buildings.
How It's Calculated
The tool measures the paintable surface first, then prices labor and materials from that number.
Gable area (two ends) = width² × (pitch ÷ 12) ÷ 24
Openings = windows × 15 + doors × 21 + garage doors × 63 sq ft
Paintable area = (wall + gable − openings) × 1.12 if trim is included
Gallons = round up (paintable area × coats × 1.10 ÷ coverage per gallon)
Labor = paintable area × rate × siding × condition × height × coat factor
Coverage per gallon is 350 sq ft for smooth siding, 325 for lap, 250 for brick and shake, and 225 for stucco. The 1.10 factor adds 10% for waste and touch-ups. Siding multipliers run from 1.0 (smooth) to 1.35 (rough wood). Condition multipliers are 1.0, 1.15 and 1.35 for good, fair and poor. Height multipliers are 1.0, 1.10 and 1.25 for one, two and three stories, covering ladder and scaffold time. Coat factors are 0.65, 1.0 and 1.3 for one, two and three coats, plus 0.25 if primer is included. Pressure washing is $0.15 per sq ft for a pro or a $75 rental for DIY, and supplies are $0.10 per sq ft with a $50 minimum. Primer is $28 per gallon. DIY painters pay $120 for ladder and sprayer rental plus $80 for each story above the first.
To stay on the safe side, gallons are always rounded up, each cost line is rounded to whole dollars, and the high end of the range (+20%) is wider than the low end (−15%). Pre-1978 homes add 15% of labor for a pro, or $150 for DIY testing and containment supplies. These are rules of thumb, not a contractor bid, and prices and regulations vary by location. In the U.S., disturbing lead paint is governed by the EPA Renovation, Repair and Painting rule (40 CFR 745).
Worked Example
A 40 × 30 ft two-story house with 9 ft walls, two gable ends at 6/12 pitch, 12 windows, 2 doors and 1 garage door. It has smooth siding in fair condition, premium paint, two coats, trim included, pressure washing included, a professional painter and a $2.00 labor rate.
- Wall area: 2 × (40 + 30) × 2 × 9 = 2,520 sq ft.
- Gables: 30² × 6 ÷ 24 = 225 sq ft.
- Openings: 12 × 15 + 2 × 21 + 63 = 285 sq ft, so net area is 2,460 sq ft.
- Trim at 12% adds 295 sq ft, for a paintable area of 2,755 sq ft.
- Paint: 2,755 × 2 × 1.10 ÷ 350 = 17.3, rounded up to 18 gallons × $45 = $810.
- Labor: 2,755 × $2.00 × 1.0 × 1.15 × 1.10 = $6,971.
- Pressure washing: $413. Supplies: $276.
The total is $8,470, or about $3.07 per paintable sq ft, with a likely range of roughly $7,200 to $10,200. That is exactly what the calculator shows when you enter these values.
Tips & Common Mistakes
- Don't skip prep. Scraping, caulking and priming bare wood decide how long the paint lasts. A cheap bid that skips prep usually means repainting years sooner.
- Measure before you buy. Guessing "about 10 gallons" is the most common error. Use the rounded-up gallon count and buy all paint at once so batch color stays consistent.
- Check for lead on older homes. If the house predates 1978, test before sanding or scraping, and hire an EPA RRP-certified contractor if you are paying someone to do it.
- Respect height limits. Above two stories, ladders become a serious fall risk. Use scaffolding or a lift, or hire a crew equipped for it.
- Budget for repairs separately. Rotted trim, damaged siding and failing caulk are not included here. Get them inspected first, because paint will not hide moisture damage.
Frequently Asked Questions
How much does it cost to paint the exterior of a house?
Most professional exterior jobs land between about $2 and $4 per square foot of paintable wall area. For a typical two-story home that is often $4,000 to $10,000. Siding type, prep, height and local labor rates move the number the most.
How many gallons of paint do I need to paint a house exterior?
Divide the paintable area by the paint's coverage, roughly 350 sq ft per gallon on smooth surfaces, then multiply by coats. A home with 2,000 sq ft of paintable area and two coats needs about 13 gallons including waste. Always round up to a whole gallon.
Is it cheaper to paint my house myself?
Usually yes in cash terms, because you skip labor, which is commonly 70% or more of a professional bid. You pay in time, equipment rental and risk, especially on tall walls. A multi-story house can take several weekends.
How often should I repaint my home's exterior?
Quality paint on well-prepped siding often lasts 7 to 10 years, while wood siding in harsh sun or wet climates may need it every 5 to 7. Fading, chalking, peeling and cracked caulk are signs it's time.
Do I need primer for exterior painting?
Use primer on bare wood, stains, patched areas, chalky surfaces or major color changes. Previously painted siding in good condition can often be painted without it. Check the box in the calculator when your surface condition is poor.
Does this estimate include lead paint safety?
Only as an allowance. If you check the pre-1978 box, the tool adds a lead-safe work cost. It does not replace testing, and it isn't a compliance or permit determination. Rules vary by state and locality, so confirm with your local authority.