How much should I charge to paint a room?

Build the price from measured wall and ceiling area, the paint needed (about one gallon per 350–400 sq ft per coat), and honest labour hours including prep, then apply your hourly rate and margin. As a sanity check, interior painting commonly runs $2–$6 per square foot of floor area, but your own measured costs are more reliable than any flat rate.

How much paint do I need for a job?

Roughly one gallon per 350–400 square feet per coat on a smooth surface. Double it for two coats, and add more for rough or porous surfaces and primer on bare or patched areas. Always round up so you are not stopping mid-job for one more gallon.

Why do painters lose money on jobs?

Almost always because prep time is underestimated and second coats, trim, and cleanup are not fully priced. The painting is quick; the preparation is not. Comparing your quoted price to the actual hours and materials on each finished job is the fastest way to find where you are underpricing.

How to Quote a Painting Job

Start by measuring, not guessing

The fastest way to lose money on a painting job is to eyeball it. A room that "looks like a day's work" can hide forty feet of trim, two closets, and a ceiling that needs two coats. Every accurate paint quote starts with measurement.

For interior walls, measure the perimeter of each room and multiply by ceiling height to get wall area, then subtract large openings like doors and big windows. Ceilings are length × width. Trim, doors, and cabinets are usually priced separately because they're labour-heavy relative to their area. For exteriors, measure each wall face and add in soffits, fascia, and any detailed trim.

You don't need to be perfect, but you need real numbers. Those square-footage figures drive both your paint quantity and your labour estimate — get them wrong and everything downstream is wrong.

Estimating paint and materials

As a working rule, one gallon of paint covers about 350–400 square feet per coat on a smooth surface. Rough, porous, or previously unpainted surfaces drink more, and a colour change usually means two coats — so double the quantity. Primer is an additional layer on bare or patched surfaces.

So for a room with 600 sq ft of wall getting two coats, you need roughly 600 × 2 ÷ 375 ≈ 3.2 gallons, rounded up to 4. Add primer if needed. Then layer in the consumables painters routinely forget: tape, plastic, drop cloths, sandpaper, filler, caulk, roller covers, and brushes. These are small per item but real, and they belong on the quote as a materials line — apply a sensible markup, as covered in material markup for contractors.

Labour is where the money is made or lost

On most paint jobs, labour is the largest cost — and prep is the part that's consistently underestimated. The painting itself is fast; the preparation is not. Filling holes, sanding, caulking gaps, taping edges, masking floors and fixtures, and cleaning up can easily equal or exceed the time spent applying paint.

Estimate labour hours by surface and condition, not just area. A clean, previously painted wall rolls quickly. A wall with cracks, water stains, glossy old paint that needs sanding, or detailed trim takes far longer per square foot. Walk the space and honestly assess condition before you put hours on paper.

Then price those hours at a rate that actually covers your costs and profit, not just a wage. If you haven't built your rate from the bottom up, work through how to calculate your labour rate and sanity-check it with the hourly rate calculator. The most common painting mistake is quoting a low day rate that quietly forgets prep time.

Per square foot vs your own numbers

Many painters quote clients a per-square-foot price because it's quick and the client understands it — interior work commonly lands around $2–$6 per square foot of floor area, or $1–$3 per square foot of wall, depending on prep and region. That's fine as a sanity check or a way to present the price.

But the rate you build the quote from should be your own measured labour plus materials plus margin. Per-square-foot averages are someone else's costs in someone else's market — anchor to them and you inherit their mistakes. Build the number up from your hours and your paint, then express it per square foot if the client prefers. For the general framework that applies to any trade, see how to price a job as a contractor.

The costs painters forget — and how to stop

The margin on paint jobs leaks through the same gaps every time: prep time absorbed without charge, a second coat that wasn't quoted, the extra gallon for a deep colour, trim priced as if it were wall, and the cleanup and disposal at the end. None of these are large on their own, but together they can turn a 35% job into a break-even one.

The discipline that fixes this is comparing what you quoted to what the job actually cost — every time. Fieldpaid lets you build the quote, then log your real hours and paint spend in seconds when the job's done, and shows your true margin versus what you quoted. After a few jobs you'll know exactly which kinds of painting work you've been underpricing and by how much.

How to Quote a Painting Job (So You Actually Make Money on It)