Painting Quote Calculator
Price a painting job from measured area and job assumptions with paint and labor costs plus overhead, margin and a minimum quote.{{ summaryTitle }}
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Takeoff and bid checks
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A painting bid starts with a physical takeoff, but the customer price has to cover much more than paint. Surface area sets the scale of the job. Coats, primer, texture, access, preparation, masking, cleanup, and detail work determine how much material and labor that area will consume. The estimate also has to recover trip costs, supplies, business overhead, and profit without hiding those costs inside an unexplained lump sum.
Simple interiors can be measured from room length, width, and wall height. Irregular rooms, corridors, exterior elevations, and mixed surfaces are usually clearer as a total wall run or a separately measured paintable area. Doors and windows reduce coating area, yet their edges still require cutting in and masking, so a large opening deduction does not always reduce labor by the same proportion.
- Takeoff
- The measured quantity of work, usually expressed as paintable square feet or square metres.
- Coverage
- The area one gallon covers for one coat under the assumed surface conditions.
- Production rate
- The paintable area completed per painter-hour, including the allowances built into the selected profile.
- Margin
- Profit as a share of the selling price. It is not the same as adding the same percentage as markup on cost.
Material demand should be separated from material purchasing. A calculated requirement of 3.2 gallons still requires four whole gallons when only full containers are being priced. Labor behaves differently: the same area takes longer when the surface needs restoration, includes ceilings, or consists mainly of trim and doors. A quote that uses a generic area price without testing those assumptions can understate either the material order or the crew time.
The result remains a planning estimate until the site, scope, and commercial terms are confirmed. Surface repairs, access equipment, occupied-room protection, color changes, product specifications, local tax rules, and contract exclusions can all change a firm bid. Work that disturbs paint in older buildings may also trigger lead-safe requirements that must be reflected in both the work plan and the price.
How to Use This Tool:
Build the quote in the same order as the job: measure the surface, describe the coating work, price the resources, then check the selling terms.
- Choose the Surface profile and Measurement basis. Use room dimensions only for a rectangular room; use wall run or known area when the geometry has already been measured more accurately.
- Enter the applicable dimensions and subtract openings by counts or measured area. Check Net paintable area before pricing coats.
- Set finish and primer coats, prep level, paint price, painter rate, overhead, and target margin. Use the coverage or production overrides only when supplier data or job records support a better assumption.
- Review the Painter-hours, paint order, modeled net margin, minimum adjustment, tax estimate, and deposit request. Revise any weak assumption before treating the total as a customer-ready bid.
Interpreting Results:
The quote total is only as reliable as the measured net area and the production rate. Compare Painter-hours with similar completed jobs and check that the whole-container paint order is credible for the specified coats. A low labor total on restoration, exterior, ceiling, or trim work is a stronger warning than a small difference in paint cost.
- Opening deduction capped means the entered doors, windows, or opening area exceeded 90% of gross area; measure the paintable surface directly.
- Minimum applied means the minimum charge, rather than the cost-and-margin result, controls the pre-tax subtotal.
- A modeled net margin below the target can result from quote rounding or a minimum floor. Confirm the actual dollar profit, not only the entered target percentage.
- Tax and deposit values are additions based on the selected assumptions. Neither proves that the tax basis or contract terms are valid in the job's jurisdiction.
Technical Details:
The model converts every measurement to square feet and every paint price to a per-gallon basis before calculating quantities. Room mode uses perimeter times wall height and adds the ceiling only for profiles that include ceilings. Wall-run mode multiplies total wall run by height, while known-area mode accepts the gross takeoff directly. Count-based openings use 21 square feet per door and 16 square feet per window, then cap the deduction at 90% of gross area.
Formula Core
Net area is gross surface area less the allowed opening deduction. Finish demand then scales with coats, coverage, and the combined preparation waste allowance.
Here A is net paintable area in square feet, C is the number of finish coats, V is coverage in square feet per gallon, and W is the total waste percentage. Finish and primer requirements are each rounded up to whole gallons for purchasing. Primer coverage is the larger of 175 square feet per gallon or 78% of finish coverage, and primer is priced at 72% of the entered finish-paint price.
Painter-hours combine application, primer, and prep time, then apply the labor factors for the surface and prep profiles.
Application time is net area divided by the production rate, scaled by finish coats divided by two. Primer time uses 85% of the finish production rate for every primer coat. Prep adds a fixed number of hours per 1,000 square feet.
| Profile | Coverage | Production | Labor factor |
|---|---|---|---|
| Interior walls repaint | 350 ft²/gal | 170 ft²/h | 1.00 |
| Interior walls and ceiling | 330 ft²/gal | 145 ft²/h | 1.08 |
| New drywall primer and finish | 275 ft²/gal | 125 ft²/h | 1.15 |
| Exterior siding repaint | 300 ft²/gal | 95 ft²/h | 1.28 |
| Trim, doors, or detail work | 430 ft²/gal | 58 ft²/h | 1.42 |
These profiles are planning assumptions, not manufacturer guarantees. Prep adds 10%, 12%, 15%, or 19% base waste for light, standard, heavy, or restoration work; extra waste is added and the combined allowance is capped at 95%. The corresponding prep hours per 1,000 square feet are 0.6, 1.4, 3.1, and 5.8.
Direct cost includes painter labor, whole-container paint and primer, sundries as a percentage of paint cost, supplies, and the trip fee. Overhead is applied to direct cost. The pre-tax selling price then converts the target margin into a price denominator rather than treating margin as markup.
D is direct cost, O is overhead as a decimal rate, and M is target margin as a decimal rate. The margin input is limited to 85%. The pre-tax subtotal is rounded to the selected increment before the minimum floor is applied. Tax is rounded to cents on either the pre-tax subtotal or direct materials, depending on the selected basis; the deposit is then calculated from the tax-inclusive quote total.
Limitations and Safety Notes:
This is a deterministic estimating model, not a site survey, supplier quote, tax ruling, or contract review. The built-in coverage, production, waste, and labor factors are editable assumptions and may not fit the coating system, substrate, crew, access, or local market.
- Confirm product coverage and primer requirements from the chosen manufacturer.
- Price repairs, containment, lifts, unusual access, occupied-space protection, and hazardous-material controls explicitly.
- Verify taxability, deposit limits, licensing, insurance, and contract terms in the job's jurisdiction.
- For U.S. work that disturbs paint in pre-1978 housing or child-occupied facilities, check whether EPA or state lead-safe renovation requirements apply.
References:
- Renovation, Repair and Painting Program: Contractors, U.S. Environmental Protection Agency, updated March 31, 2026.