Paint Cost Calculator
Gallons and Total Cost for Any Job
Calculate the exact material cost for any paint job. Enter your surface area, coverage rate, number of coats, and price per gallon — total cost, gallons needed, and cost per square foot appear instantly.
Have your square footage? Enter it with your paint price below — total cost and gallon count appear instantly with a per-coat and per-sq-ft breakdown.
Net paintable area in square feet. Subtract doors (~20 sq ft each) and windows (~15 sq ft each) before entering.
Economy: $25–$35 · Mid-range: $40–$58 · Premium: $70–$127
MPI benchmark — previously painted interior wall in average condition
Standard — new surfaces, colour change, or bare substrate
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The paint cost formula
Paint cost calculation follows a logical sequence: convert area to gallons, round up, then multiply by price per gallon. The critical variable is not the price — it is the coverage rate used for the gallon conversion. Using the wrong spread rate produces a gallon count that is off by 20–40%, which compounds directly into the cost estimate.
Core Formula
Total Cost = ⌈(Area ÷ Coverage Rate) × Coats⌉ × Price per Gallon
A worked example: 600 sq ft of standard interior walls at 350 sq ft/gal, 2 coats, $52/gal (mid-range paint). Gallons = (600 ÷ 350) × 2 = 3.43 → round up to 4 gallons. Total cost = 4 × $52 = $208. Cost per sq ft = $208 ÷ 600 = $0.35/sq ft for materials only. See our guide to calculating paint cost for how to build this into a full client quote alongside labour.
The formula applies identically to interior and exterior surfaces — the only variable that changes is the coverage rate. Exterior stucco at 200 sq ft/gal produces nearly double the gallon count (and cost) of smooth interior drywall at 400 sq ft/gal for the same square footage. Our paint coverage calculator covers substrate-specific rates in detail.
Price per gallon by quality tier
The architectural coatings market in 2025 is stratified into three tiers with meaningfully different performance characteristics — not just different price points. The spread rate and one-coat hide capability determine the true cost-per-covered-sq-ft, which often inverts the apparent price hierarchy.
| Tier | Price per Gallon | Coverage | One-Coat Hide | Best For |
|---|---|---|---|---|
| Contractor / Economy | $25–$35 | 350 sq ft/gal | No | Rental properties, bulk new construction |
| Mid-Range Residential | $40–$58 | 375 sq ft/gal | Partial | Standard residential repaints, 2-coat spec |
| Premium Residential | $70–$127 | 400 sq ft/gal | Yes | Colour changes, high-traffic rooms, single-coat spec |
| Exterior Economy | $30–$50 | 350 sq ft/gal | No | Low-exposure siding, investment properties |
| Exterior Mid-Range | $50–$80 | 375 sq ft/gal | Partial | Standard residential exterior, 2-coat spec |
| Exterior Premium | $85–$120+ | 400 sq ft/gal | Yes | Wood siding, high-UV exposure, long-cycle repaints |
The premium tier's higher coverage rate (400 vs 350 sq ft/gal) reduces the gallon count by 12.5% before the price premium is even considered. On a 1,000 sq ft job: economy spec needs 6 gallons at $30 = $180 per coat; premium spec needs 5 gallons at $95 = $475 per coat. But if premium eliminates the second coat entirely, the 2-coat economy system costs $360 in paint versus $475 in premium — a difference of $115. At labour rates of $2–$6/sq ft, the eliminated coat saves $2,000–$6,000. Premium paint is not a luxury — it is a labour optimisation. Our paint project cost calculator models the full labour and materials picture.
Cost per coat breakdown
Breaking the total material cost into per-coat figures helps with two decisions: scheduling material deliveries across a multi-day job, and comparing the cost impact of adding or removing a coat from the spec.
Per-Coat Cost
Cost per Coat = ⌈Area ÷ Coverage Rate⌉ × Price per Gallon
For the example above (600 sq ft, 350 sq ft/gal, $52/gal): gallons per coat = ⌈600 ÷ 350⌉ = 2 gallons. Cost per coat = 2 × $52 = $104. Total for 2 coats = $208. The per-coat view also exposes where a 3-coat spec becomes expensive — that same 600 sq ft job at 3 coats jumps to $312 in materials, which is a 50% increase over the 2-coat spec for the same surface.
One common estimation error is applying a reduced coverage rate to the second coat on the assumption that the sealed first coat allows the second to spread further. The industry standard is to apply the same coverage rate to every coat. Paint manufacturers base their durability warranties on achieving a minimum dry film thickness across the entire system — reducing paint on any coat voids that warranty. The paint gallon calculator enforces this same-rate rule for each coat.
Pro vs DIY cost comparison
Material cost is the same whether you hire a contractor or paint yourself. The difference is labour. Professional painting labour in 2025 runs $2.00–$6.00/sq ft for interior walls and $1.50–$4.17/sq ft for exterior siding, per PCA and Angi data. On a standard project, labour accounts for 75–85% of the total invoice.
| Project Scope | Materials Only (DIY) | Total Pro Cost | Labour Component |
|---|---|---|---|
| Small bedroom (10×10, 8 ft) | $40–$90 | $200–$600 | ~75% |
| Standard bedroom (12×10, 8 ft) | $50–$110 | $240–$720 | ~78% |
| Living room (16×14, 9 ft) | $80–$180 | $450–$1,540 | ~82% |
| Full interior (1,500 sq ft) | $450–$900 | $3,000–$7,500 | ~85% |
| Exterior (1,500 sq ft single-story) | $400–$900 | $3,500–$8,000 | ~85% |
DIY breaks even against hiring when your effective hourly rate is lower than what a painter charges per hour — roughly $23–$40/hour for the trade labour portion of the invoice, not the total billing rate. For large, straightforward projects (single-colour full-room repaints on smooth surfaces), DIY is economical. For projects requiring extensive surface prep, scaffolding, or multiple colours, the time requirement often erases the apparent savings. Our paint coverage calculator can help you scope the prep requirements by surface type.
Frequently asked questions
Why is premium paint cheaper per sq ft despite a higher price per gallon?
Premium paints ($70–$127/gal) achieve one-coat hide on colour changes, eliminating a full application coat. Because professional labour runs $2–$6 per sq ft, saving one coat on a 500 sq ft room saves $1,000–$3,000 in labour — far more than the extra $30–$60 in material cost for that room. The total cost per sq ft for a premium one-coat system is almost always lower than an economy two-coat system once labour is included.
Should you buy all paint from the same batch for colour consistency?
Yes — always buy your full quantity in a single purchase from a single mixing session. Custom-tinted paint mixed on two different dates can show a visible hue difference under directional natural light due to metamerism, even when the same formula code is used. Calculate your full project total before purchasing, and store leftover paint in a sealed can with plastic wrap pressed under the lid for touch-up use.
How much does paint typically represent in a full room renovation?
Paint materials typically account for only 15–25% of total professional paint project cost — labour makes up the remaining 75–85%. In a $1,200 room paint job, materials might be $180–$300 with labour at $900–$1,020. This ratio is why choosing premium paint to reduce coat count almost always delivers better total economics than minimising material spend.
What is the best way to estimate paint cost for a client quote?
Calculate net area (gross area minus door and window deductions), divide by the appropriate coverage rate for the substrate, multiply by coat count, round up to whole gallons, and multiply by price per gallon. Add 10–15% to your gallon quantity for the waste factor before pricing. Keep labour as a separate line — never embed it in the paint unit cost, as this makes the estimate impossible to audit or adjust when labour rates change.
Can you mix leftover paint from different cans?
You can mix leftover paint from the same colour, finish, and product line within the same brand — this is called box mixing. Combine multiple partial cans into one container and stir thoroughly to homogenise any minor batch variation. Never mix different sheens, different brands, or different product lines — incompatible chemical systems produce unpredictable film formation and durability failures.
References
Painting Contractors Association. (2023). PCA Standard P1 — Touch Up Painting and Damage Repair, and Definition of a Properly Painted Surface. PCA Industry Standards.
Master Painters Institute. (2025). MPI Maintenance Repainting Manual (RSM). MPI Publications.
Angi. (2025). 2025 State of Home Spending Pulse Report. Angi Research.
Bureau of Labor Statistics. (2025). Occupational Employment Statistics — SOC 47-2141: Painters, Construction and Maintenance. U.S. Department of Labor.