Interior Painting Cost Calculator
Estimate what it costs to paint a room from its floor size and a price per square foot of floor area.
Calculator
Free, runs entirely in your browser, and your numbers never leave your device. Results are estimates for planning only.
What this calculator does
This calculator estimates interior painting cost using the room's floor area and a price per square foot — the way painters often quote whole rooms. The price level reflects how much is painted: walls only, walls plus trim and ceiling, or a premium job with patching, priming, and higher-grade paint. You can also enter your own price to match a quote.
How to use it
- Enter the room's length and width to set the floor area painters quote against.
- Pick a price level for how much of the room is being painted, or type your own price per square foot.
- Read the estimated total and the typical span.
The formula
Cost = floor area × price per sq ft. Painters often quote interior work per square foot of floor area, with the level reflecting walls only versus walls, trim, and ceiling.
Example calculation
A 12 ft × 14 ft room at the average level of $4/sq ft (walls, trim, and ceiling):
- Floor area: 12 × 14 = 168 sq ft
- Cost: 168 × $4 = $672
- Typical span: 168 × $2 to 168 × $7 = $336 – $1,176
Result: About $670 to paint this room including trim and ceiling at an average rate.
Buying and planning tips
- Labor is the bulk of an interior paint bill — usually 70–80% of the total.
- Dark-to-light color changes, patching, and high ceilings push the price toward the premium level.
- Doing the painting yourself can cut the cost to mostly the price of paint and supplies.
Common mistakes to avoid
- Pricing walls only when the quote you compare against also includes trim and ceiling.
- Forgetting primer for big color changes or bare patches.
- Underestimating prep time on damaged or previously glossy walls.
Assumptions and limits
- Prices are approximate U.S. averages per square foot of floor area as of May 2026.
- What's included rises with the level: walls only, then trim and ceiling, then full prep.
- Very high ceilings, heavy repairs, and specialty finishes can exceed the premium level.
Frequently asked questions
How much does it cost to paint a room?
Painters often quote about $2 per sq ft of floor area for walls only, around $4 for walls, trim, and ceiling, and $7 or more for a premium job with prep and high-grade paint. A typical 12×14 ft room runs roughly $340 to $1,180.
How is interior painting priced per square foot?
Many painters quote per square foot of floor area as a quick shorthand, with the rate reflecting how much of the room is painted and how much prep it needs. Enter your room size and pick a level above.
Does the price include paint?
Yes — each level bundles paint and labor. Since labor is most of the bill, doing it yourself drops the cost to mainly paint and supplies; model that with the custom-price box.
Are these prices exact?
No. They are approximate U.S. averages for budgeting only and vary by region, ceiling height, and wall condition — always get local quotes.
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