A 1,000-square-foot New Orleans home interior typically needs 16 to 22 gallons of paint for walls, ceilings, and trim with two coats. Walls alone take 10 to 15 gallons. The spread depends on how much of that 1,000 square feet is wall surface rather than floor, how many coats the color change demands, and whether your plaster is smooth or textured.
That range is wider than most calculators admit, and the reason is local. Older homes across Uptown, Mid-City, and the Bywater carry lath-and-plaster walls that drink more paint than modern drywall. TurnKey Painter has been estimating New Orleans interiors long enough to know the difference between a paper number and a purchase order. If you would rather have someone measure it properly, get in touch or call (504) 608-5528.
Key takeaways
- Floor area is not a paintable area. A 1,000 sq ft home has roughly 2,300 to 2,800 sq ft of wall surface.
- One gallon covers 350 to 400 sq ft on smooth surfaces, dropping to 300 to 350 sq ft on textured or porous walls.
- Two coats is the working assumption. Single-coat coverage is rare outside a same-color refresh.
- Ceilings add 5 to 6 gallons at two coats. Trim, doors, and windows add 1 to 2 gallons of enamel.
- Buy roughly 10 percent over your calculation. Touch-ups a year later never match a fresh batch.
Why does floor area mislead you?
The number on your property listing describes floor space. Paint goes on walls, and the two figures are only loosely related. A 1,000 sq ft shotgun with long narrow rooms has considerably more wall than a 1,000 sq ft square-plan cottage, because the perimeter is longer relative to the area enclosed.
Measure the perimeter of each room, multiply by ceiling height, then subtract openings. A typical New Orleans room with 10-foot ceilings and a 40-foot perimeter gives 400 sq ft of wall before you take out doors and windows. Deduct about 20 sq ft per door and 15 sq ft per average window.
Across a whole 1,000 sq ft home, that arithmetic usually lands between 2,300 and 2,800 sq ft of paintable wall, which is the figure our interior house painting estimates start from. High ceilings push it higher. Many pre-war homes here run 11 or 12 feet, which adds several hundred square feet compared to a standard 8-foot ceiling.
A worked example
Take a 1,000 sq ft home with four rooms averaging 250 sq ft each, 10-foot ceilings, six doors, and eight windows.
- Wall surface before deductions: approximately 2,600 sq ft
- Less six doors at 20 sq ft: 120 sq ft
- Less eight windows at 15 sq ft: 120 sq ft
- Net paintable wall: approximately 2,360 sq ft
At 375 sq ft per gallon, one coat needs 6.3 gallons. Two coats need 12.6 gallons for walls alone. Add the ceiling and the trim, and this house lands near 19 gallons in total. That is the figure people underestimate most, because the widely repeated rule of thumb of about ten gallons for a 1,000 sq ft home assumes 8-foot ceilings and often only one coat.
Coverage rates and where they break down
Manufacturers publish spread rates on every data sheet, and they are honest figures for the conditions they assume. Sherwin-Williams publishes a paint calculator built on the same arithmetic. A gallon of interior paint generally covers 350 to 400 square feet. Benjamin Moore lists Regal Select at 400 to 450 sq ft per gallon, among the highest published in its class. Sherwin-Williams ProMar 200 is rated at 350 to 400 sq ft per gallon.
Those figures assume a smooth, sealed, previously painted surface. Three local conditions pull them down.
Texture
Rough or textured walls reduce coverage to roughly 300 to 350 sq ft per gallon. Skip-trowel and orange-peel finishes have more surface area than the flat measurement suggests, and paint has to fill the valleys.
Porosity
Bare plaster, new drywall, and previously unpainted wood all absorb the first coat rather than sitting on top of it. On unsealed surfaces the first coat behaves more like a primer, and coverage drops sharply. Priming first is cheaper than spending a premium topcoat on absorption.
Color change
Going from a dark wall to a light one can take three coats regardless of what the can promises. Deep bases and strong colors also carry less opacity, because the pigment load that makes a color vivid is not the pigment load that hides what is underneath.
What to budget by surface
| Surface | Typical quantity: 1,000 sq ft home | Notes |
|---|---|---|
| Walls, two coats | 10 to 15 gallons | The bulk of the job; ceiling height drives the range |
| Ceilings, two coats | 5 to 6 gallons | Flat ceiling paint, separate product |
| Trim, doors, windows | 1 to 2 gallons | Enamel, sold and applied separately |
| Primer, where needed | 1 to 3 gallons | Only on bare, patched or stained areas |
| Total | 16 to 22 gallons | Plus roughly 10 percent spare |
Quantity is only half the budget question. What it costs to paint an interior room covers the labor side, which is where most of the money goes.
Trim paint deserves a note. It is bought by the gallon like wall paint but goes much further per linear foot, and most homes need only one or two gallons even when every door and baseboard is being redone. The cost per gallon is higher because enamel formulations cost more to make.
Gallons by room, for a quicker estimate
If you would rather not measure every wall, these figures cover two coats on walls in rooms of typical New Orleans proportions with 10-foot ceilings. Add a gallon per room if your ceilings run 12 feet.
| Room | Approximate floor area | Walls, two coats |
|---|---|---|
| Bathroom | 40 to 60 sq ft | 1 to 2 gallons |
| Bedroom | 120 to 180 sq ft | 2 to 3 gallons |
| Living or dining room | 200 to 300 sq ft | 3 to 4 gallons |
| Kitchen, minus cabinet runs | 150 to 200 sq ft | 2 gallons |
| Hallway and stairwell | varies | 1 to 3 gallons |
Kitchens take less than their floor area suggests, because cabinets, backsplash, and appliances occupy walls that never see paint. Stairwells take more than they look, because the wall follows the rise and the ceiling height at the top of a flight can be double what it is at the bottom.
Four mistakes that blow the estimate
Measuring the floor instead of the walls. The most common error, and it usually produces an order roughly half the size of what the job needs.
Forgetting the ceiling is a separate product. Ceiling paint is formulated flat to hide imperfections and to resist spatter. Using wall paint overhead costs more and performs worse.
Assuming one coat because the label says one-coat coverage. That claim holds for a narrow set of conditions, usually a light color over a similar light color on a sealed surface. It rarely survives contact with a real repaint.
Buying trim enamel by wall-paint logic. Trim needs far less volume but a different product, and running out mid-run means a visible break where the new can starts.
Want this measured rather than estimated? Request a free estimate or call (504) 608-5528 and we will walk the job with you.
The New Orleans variables
Local conditions change the arithmetic in ways a national calculator will not tell you.
Humidity leaves the quantity alone and attacks the schedule. New Orleans averages 76 percent relative humidity across the year, reaching 88 percent in the early morning and easing to 61 percent by mid-afternoon. Recoat windows stretch in that air. A paint rated for four hours between coats can want six or more on an August morning, and rushing the second coat is how you get a finish that never fully hardens.
Premium products cover further per gallon, so the grade you choose changes the quantity as well as the price. Which interior paint suits this climate covers that choice.
Plaster is common, and it is thirsty. A large share of the housing stock here predates drywall. Original lath and plaster, particularly where it has been patched over decades, absorbs unevenly. Two coats over a well-sealed plaster wall behave normally. Two coats over patched, unsealed plaster can look blotchy until a third goes on.
Ceiling heights run tall. Twelve-foot ceilings in a Garden District double add roughly 40 percent more wall than an 8-foot ceiling in the same footprint. This is the single largest reason local estimates come in above national calculators.
How to measure your own home
- Measure each room’s perimeter. Add the length of all four walls.
- Multiply by ceiling height. That gives the gross wall area for the room.
- Subtract openings. Roughly 20 sq ft per door, 15 sq ft per window.
- Add the rooms together. This is your net paintable wall area.
- Divide by 375. That is one coat in gallons. Double it for two coats.
- Add 10 percent. Spare paint for touch-ups and insurance against a miscalculation on site.
Measure ceilings separately by floor area, since a ceiling’s square footage equals the room’s floor square footage. Trim is estimated by eye rather than measured, because one gallon of enamel covers a great deal of baseboard.
Buying more than you need is usually the right call
Paint is mixed in batches. Two gallons of the same color ordered three months apart can differ subtly, and on a large wall that difference is visible in raking light. Buying the full quantity at once, from the same batch, keeps the finish consistent.
Keep the leftover sealed and labelled with the room it belongs to. In a climate where a leaking roof or a burst supply line is a live possibility, a matched touch-up gallon on the shelf is worth its price several times over.
Frequently asked questions
How much paint for a 1,000 sq ft house interior?
Sixteen to twenty-two gallons covers walls, ceilings, and trim with two coats. Walls alone take ten to fifteen gallons. Ceiling height is the main variable, and textured plaster pushes it higher still.
Does one gallon really cover 400 square feet?
On a smooth, sealed, previously painted wall, yes. On textured or porous surfaces, expect 300 to 350 sq ft. Manufacturer figures describe ideal conditions rather than typical ones.
Do I need primer on every wall?
No. Primer belongs on bare plaster or drywall, patched areas, stained surfaces, and anywhere you are covering a dramatically darker color. Repainting a sound, previously painted wall in a similar shade rarely needs it.
How many coats should I plan for?
Two, as the working assumption. One coat is realistic only for a same-color refresh on a sound surface. Dark-to-light changes can take three.
Does high humidity change how much paint I need?
The quantity stays the same. The schedule stretches, because longer recoat windows in humid conditions mean the job takes more days, and applying the second coat too early can compromise the finish.
Get a measured estimate instead of a calculated one
Arithmetic gets you close. A walkthrough gets you accurate because it accounts for the plaster condition, the ceiling height, the number of color changes, and the prep your particular home needs. TurnKey Painter serves Metairie, Kenner, Slidell, Covington, Mandeville, Harahan, River Ridge, Gretna, LaPlace, St. Rose, Hammond, Madisonville, and Baton Rouge.
Call (504) 608-5528 or request a free estimate, and we will measure the actual surfaces rather than guessing from a floor plan.
Related reading
Sources
- Benjamin Moore Regal Select published spread rate, 400 to 450 sq ft per gallon; Sherwin-Williams ProMar 200, 350 to 400 sq ft per gallon. Manufacturer product data, accessed 2 September 2026.
- Relative humidity for New Orleans, 76 percent annual average, 88 percent morning, 61 percent afternoon. World Data Center for Meteorology, Climate of the World, 1961 to 1990, via Current Results. Accessed 2 September 2026.
This article is general information about painting materials and estimating. It is not a quote. Actual paint quantities depend on your home’s measured surfaces, existing finish and condition.