A Sherwin-Williams paint cost calculator can estimate paint purchases from wall area, coverage, and the number of coats. For a typical interior room, paint often costs about $50-$110 per gallon before discounts; paint, supplies, and professional labor can bring a room project to $400-$1,200 or more.
| Item | Low | Average | High | Notes |
|---|---|---|---|---|
| Interior paint | $50/gal | $75/gal | $110/gal | Approximate retail range; product and local pricing vary |
| Paint for 300 sq ft | $45 | $75 | $110 | About 1-2 gallons for two coats at 350 sq ft per gallon |
| One 12-by-12-foot room | $100 | $275 | $650 | Paint and basic supplies; DIY, standard prep |
| Professional room painting | $400 | $750 | $1,200 | Walls, ordinary access, labor and materials |
What Sherwin-Williams paint costs per gallon and per room
Sherwin-Williams interior paint generally falls around $50-$110 per gallon at regular retail pricing. Entry-level or contractor-grade products may be near $40-$65, midrange lines often run $60-$90, and premium lines can reach $90-$120 or more. Quart pricing is commonly about $15-$35, though a gallon is usually more economical for larger jobs.
For budgeting, $75 per gallon is a reasonable planning figure for a midrange interior paint before tax and discounts. Actual prices vary by product, sheen, location, account pricing, and promotions. Exterior products may cost about $55-$120 per gallon, depending on formulation and finish.
A typical 12-by-12-foot room with 8-foot ceilings may need about 2 gallons for two coats on the walls, after allowing for openings and normal waste. At $50-$110 per gallon, that is roughly $100-$220 for wall paint alone. Including primer, tape, roller covers, and drop cloths, a DIY materials budget often reaches $150-$350.
Assumptions: 350 sq ft of coverage per gallon, two coats, ordinary wall condition, and standard 8-foot ceilings. Coverage varies by product, surface texture, color change, and application.
How paint, primer, supplies, and labor shape the quote
A professional estimate separates paint from preparation and application labor. The table gives broad U.S. planning ranges; a small job may have a minimum charge, while extensive repairs or difficult access can push prices higher.
| Quote component | Low | Average | High |
|---|---|---|---|
| Interior paint | $50/gal | $75/gal | $110/gal |
| Primer | $20/gal | $35/gal | $55/gal |
| Labor | $25/hr | $50/hr | $85/hr |
| Supplies and masking | $30/job | $75/job | $180/job |
| Wall repair and sanding | $50/job | $175/job | $500/job |
| Furniture moving or disposal | $0 | $75/job | $250/job |
Labor prices depend on the market, crew, and work included. Some contractors quote by the room or square foot rather than the hour. Interior wall painting commonly falls around $1.50-$4 per paintable sq ft for labor and materials, with detailed trim, repairs, or high ceilings priced separately.
Ask whether the quote includes surface preparation, primer, two finish coats, cleanup, and paint. A low bid may exclude patching or use a different product line, making estimates difficult to compare.
Wall area, coverage, and coats change the calculator result
Start with wall area, not floor area. Add the lengths of the room’s walls and multiply by ceiling height; then subtract large doors and windows if desired. Multiply the resulting paintable area by the number of coats, and divide by the product’s stated coverage per gallon. Round up to whole gallons to account for packaging and touch-ups.
Basic formula: paintable wall sq ft × coats ÷ coverage per gallon = gallons to buy. A practical planning allowance is 300-400 sq ft per gallon per coat. Use the product label’s coverage estimate when available; rough plaster, masonry, and porous drywall can absorb more paint.
Two coats are common, especially when changing color or applying a standard finish over a contrasting shade. A similar color on a smooth, sound wall may need less coverage, but the manufacturer’s directions and the desired finish matter. Deep colors, dramatic color changes, and uneven surfaces may require an additional coat or tinted primer.
Room dimensions can change the purchase by a gallon or more. A 10-by-10-foot room with 8-foot walls has about 320 sq ft of gross wall area before subtracting openings. A 20-by-20-foot room has about 640 sq ft; two coats at 350 sq ft per gallon require roughly four gallons before rounding or waste. Ceilings and trim should be calculated separately.
Assumptions: the calculation treats each coat as covering the full paintable area and rounds up to whole gallons. Check the selected paint’s label for its coverage and recommended application.
Which product, sheen, and surface condition add cost?
Paint line and sheen affect the gallon price, but the right choice depends on the surface and expected wear. A lower-priced product may be suitable for a low-traffic room, while washable finishes or premium formulations can raise material cost. Flat finishes often help disguise minor wall flaws; satin and semi-gloss are commonly selected for surfaces that need more frequent cleaning.
Upgrading from a $60 gallon to a $100 gallon adds $80 when a four-gallon project is required. That is a material comparison, not a guarantee of longer service life or fewer coats. Compare the exact product, finish, and coverage rather than relying only on a brand name or line category.
Surface condition can matter as much as paint selection. New drywall, water stains, smoke residue, peeling paint, and patched areas may need specific primer or repairs. Primer commonly adds $20-$55 per gallon, while extensive scraping, patching, or stain treatment can add $100-$500 or more in labor and materials.
Color changes also affect the estimate. A light shade over a similar light shade may cover differently from a dark color over white or a bright color over a deep base. Request a written specification for the number of coats and primer so the estimate reflects the actual color change.
How to calculate gallons for a room, ceiling, or whole house
For a room, measure each wall or use perimeter multiplied by ceiling height. Subtract substantial openings, then calculate walls and ceiling as separate surfaces. For a ceiling, multiply room length by width. For trim, windows, and doors, ask the painter to price them separately or use a measured linear-foot estimate.
Example: a 12-by-12-foot room with 8-foot walls has 384 sq ft of gross wall area. Subtract roughly 40 sq ft for a door and window, leaving 344 sq ft. Two coats equal 688 sq ft of coverage; at 350 sq ft per gallon, the result is 1.97 gallons, so a buyer would typically plan on 2 gallons, with extra paint if the walls are rough or touch-ups are important.
For a ceiling in that room, 12 × 12 equals 144 sq ft. Two coats at the same assumed coverage need about 0.82 gallon, so one gallon is a practical purchase. Ceiling paint may be a separate product, and a textured ceiling can use more than a smooth one.
For a whole house, calculate each room rather than applying a single allowance to floor area. A 1,500-sq-ft home does not automatically require 1,500 sq ft of wall paint: wall area depends on layout, ceiling height, openings, and whether closets, ceilings, or trim are included. A painter’s measured proposal is useful for checking a large estimate.
Three room estimates show how the total changes
The examples below assume midrange paint at $75 per gallon, two coats, and ordinary preparation. They exclude sales tax and major repairs. DIY totals include basic supplies; professional totals include typical labor and materials but can differ substantially by city and scope.
| Project | Paint estimate | DIY materials | Professional total |
|---|---|---|---|
| 10-by-10 room, walls only | 2 gal; about $150 | $180-$300 | $400-$750 |
| 12-by-12 room, walls and ceiling | 3 gal; about $225 | $250-$425 | $600-$1,000 |
| 20-by-20 room, walls only | 4 gal; about $300 | $350-$600 | $900-$1,600 |
Professional totals vary with wall height, furniture, trim, repairs, and local rates. The 20-by-20 example uses about 640 gross sq ft of wall area before deductions; two coats at 350 sq ft per gallon need about four gallons. Painting the ceiling or trim adds separate paint and labor.
Use these figures as quote checks, not fixed national prices. Ask each contractor to state the measured area, product name, sheen, number of coats, prep tasks, and exclusions. A quote that includes patching and two coats is not directly comparable with one that covers paint application only.
How labor hours and local rates affect a painting bill
A straightforward bedroom may take one or two painters about 6-12 working hours for protection, minor prep, two wall coats, and cleanup, though drying time can extend the visit or project schedule. Larger rooms, high ceilings, complex trim, occupied spaces, or extensive repairs require more crew time. Labor is often the largest part of a professionally painted room.
Hourly labor may range from about $25-$85 per worker, with many markets falling near $40-$65. Contractors may instead quote a project rate that includes overhead, insurance, travel, and profit. Per-square-foot charges for interior painting are often about $1.50-$4 including materials, but the basis of measurement varies.
Urban markets and high-cost coastal areas may run roughly 15%-35% above a national middle-market estimate. Smaller towns or rural areas can be about 5%-20% lower, although limited contractor availability or long travel distances can erase that difference. Regional figures are broad comparisons, not a substitute for local written quotes.
Compare total scope and crew hours, not just the hourly rate. A faster, experienced crew may charge more per hour but require fewer hours; a project bid should clarify whether extra work is billed at an hourly rate or requires approval first.
Ways to lower the Sherwin-Williams paint bill without cutting coverage
Measure accurately and buy enough paint for the planned coats, but avoid ordering gallons based only on room floor area. Combine rooms using the same color and sheen where practical, and ask the store or contractor about current promotions or project pricing. Retail discounts vary, so confirm the final quoted price rather than assuming a sale will apply.
Keep the scope controlled: paint walls separately from ceilings, trim, doors, and closets unless those surfaces are included in the budget. Choosing a standard color and sheen can simplify purchasing; a premium finish or custom color should be selected for a clear performance or appearance reason, not automatically added to every room.
Move small furniture, remove wall decor, and clear access before the crew arrives if the contractor permits it. This can reduce setup time, but do not perform repairs that require specialized treatment or risk damaging the surface. Ask whether basic patching is included and request a price for larger repairs before work begins.
For sound walls with a minor color change, ask whether a separate primer coat is necessary; do not skip primer on bare drywall, stains, or surfaces that need it. Compare at least two or three itemized estimates using the same paint line, coat count, prep scope, and exclusions. Repair can be cheaper than repainting an entire area when damage is limited, but peeling or widespread failure may require broader preparation.
Scheduling can also affect price. Flexible dates may make it easier to avoid urgent or tightly booked work, while exterior painting depends on suitable temperatures and dry weather. Confirm the paint product’s application limits and the contractor’s weather plan before setting an exterior start date.