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Renovation & Construction

Ceiling Paint Calculator

Work out the litres or gallons of paint a ceiling takes from its area, the number of coats and the spread rate on the tin.

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  • Every formula cited
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The area of the ceiling — for a flat ceiling, the room's floor area.

A flat ceiling covers the floor beneath it, so length × width of the room is the ceiling area. A sloping ceiling is larger than the floor under it: measure along the slope. Skylights and roof windows are small enough that they are usually painted round rather than taken off.

Tools needed: Tape measure or laser measure

Two coats is the usual finish for a ceiling.

One coat of the same white over a sound white ceiling can be enough. A stained ceiling needs a stain-blocking primer first rather than a third coat, and new plaster needs a mist coat, which is counted with the primer.

The area one unit of your paint covers per coat — printed on the tin.

North American ceiling paints are commonly rated at about 300 to 450 sq ft per gallon (7.4 to 11 m² per litre); UK and European matt emulsions often state up to 13 to 17 m² per litre. The default, 10 m² per litre (about 400 sq ft per gallon), sits inside the first range and below the second. The tin's own figure is the one to use; a textured or artexed ceiling takes noticeably more than it states.

Ceiling paint needed

0.8 gal

High confidence
Ceiling area
160 ft²
Area to coat, all coats
320 ft²
Then change the inputs to see how far the answer moves.

Show calculation logic

How this was calculated

Formula source(s)

  • Paint needed = area × coats ÷ spread rate — the loss-free identity every coating quantity starts from, with the spread rate taken from the product's own data sheet or tin
  • Ceiling paints are rated per coat on a smooth, sealed surface: commonly about 300 to 450 sq ft per gallon (7.4 to 11 m² per litre) in North America, and often up to 13 to 17 m² per litre for UK and European matt emulsions; a porous or textured surface takes more

Inputs used

Ceiling area
160 sq ft
Number of coats
2
Spread rate
400 ft²/gal

Intermediate steps

Ceiling area
160 ft²
Area to coat, all coats
320 ft²
Final result0.8 gal

What this calculation does not cover

  • The figure is paint that reaches the ceiling. Rolling overhead flicks more onto the floor and the roller than wall work does, and nothing is added for that, for the tray or for touching up — add it as an allowance.
  • One spread rate stands for every coat, though the first coat onto a porous or newly plastered ceiling soaks in and covers less than the second.
  • A mist coat on new plaster, and a stain-blocking primer over water marks, are separate products and are not part of this figure.
  • Coving, beams and the tops of cornices are painted with the ceiling but are not in a floor-area measurement; on a room with deep beams they add noticeably to the area.
  • Preparing an old ceiling is where the risk is, not painting it. A textured or popcorn coating applied before 2000 can contain asbestos, and paint under later coats in older housing can be lead-based; scraping, sanding or drilling either releases it, while painting over a sound coating does not. Have it tested before disturbing it. No quantity on this page depends on it.

Estimated cost — your price

This site holds no price list for this material — local prices vary too much to publish honestly. Enter your supplier's price and the result is costed with it.

Part of bigger jobs

This trade is one line of several job takeoffs. Run the whole job and every other trade comes back with it, off the same measurements.

Or plan the space itself: measure it once, doors and windows included, and this figure comes back worked out on that space, with what goes with it.

Computed in your browser — nothing you enter is uploaded. Presented in US customary units and US trade terminology. Where a formula follows a published standard, that standard and its edition are cited beside it on this page; where none governs, the page says so. Local amendments override model codes — verify against the code in force where you build.

Sources checked 2026-09-17 · v1.0.0

Regulatory standards & verification citations2
  1. Paint needed = area × coats ÷ spread rate — the loss-free identity every coating quantity starts from, with the spread rate taken from the product's own data sheet or tin
  2. Ceiling paints are rated per coat on a smooth, sealed surface: commonly about 300 to 450 sq ft per gallon (7.4 to 11 m² per litre) in North America, and often up to 13 to 17 m² per litre for UK and European matt emulsions; a porous or textured surface takes more
Cite this page

Your workspace

Most jobs need more than one number. Add the calculators you need next and they open right here, underneath this one — your figures stay on screen and nothing is lost to a page change.

Protection this work requires

  • Stop and check first. Paint under later coats in older housing can be lead-based, and sanding or heat-stripping it produces lead dust that is especially harmful to children and to anyone pregnant. Test before you disturb it — this is a job for a tested, controlled method, not a better mask.

Tools and safety for this job

To roll and cut in two coats, prepare a surface for paint and mist-coat or prime the new surface. Generic types, no brands, no prices.

  • Joint-compound dust is very fine and travels: a P1/FFP1 mask is the minimum, and a damp-sponge finish avoids most of it.
  • A dust mask does nothing about solvent vapour: ventilate through, and use an organic-vapour (A1) cartridge respirator in an enclosed room.
  • Most fatal falls on small jobs are from under three metres: use a tower or a ladder tied at the top, and never work off the top two rungs.
Show the 12 tools this job needs

Essential

  • Brushes

  • Dust sheets and masking

  • Filling knife

  • Roller frame, sleeves and tray

  • Scraper

Recommended

  • Caulking gun

  • Extension pole

  • Mixing bucket or tub

  • Pole sander

  • Random orbital sander

  • Step ladder

Optional

  • Dust extractor or vacuum with a fine filter

Also needed as materials: abrasive discs, caulk and sealant cartridges, masking tape, plastic sheeting, roller sleeves, sanding screens or paper.

what each painting tool is for, and the spec that decides which to buy where one does.

Already have some? How many ceilings will my paint cover?

Worked example: Bedroom repaint — step 5 of 7

The data behind it: Production rates by operation

How to calculate ceiling paint in 4 steps

  1. Ceiling areaThe area of the ceiling — for a flat ceiling, the room's floor area.
  2. Number of coatsTwo coats is the usual finish for a ceiling.
  3. Spread rateThe area one unit of your paint covers per coat — printed on the tin.
  4. Ceiling paint neededThe tool computes the ceiling paint needed from those figures and shows the formula, its sources, and a confidence rating alongside it.

Ceiling paint needed by ceiling area

Page defaults, not your figures above.

Ceiling areaCeiling paint needed (gal)
100 sq ft0.491
150 sq ft0.736
200 sq ft0.982
250 sq ft1.23
300 sq ft1.47

Frequently asked questions

Is ceiling paint worked out any differently from wall paint?
The sum is the same — area times coats divided by the spread rate — but the inputs are not. A ceiling's area is simply the floor area of the room, with no doors or windows to take off, and ceiling paint is usually a separate flat white with its own spread rate. Working it out on its own also means the walls and the ceiling are bought as the two separate tins they usually are.
How much extra should I allow for painting overhead?
A common allowance is 10% on a smooth ceiling, more than for walls, and a textured ceiling can use more. Rolling a ceiling throws a fine spray off the roller and loads more onto the sleeve and tray, and a heavy nap roller on a textured ceiling holds a lot of paint; a ceiling-specific paint that is formulated not to spatter wastes less.
Do I need to prime a ceiling first?
A sound, previously painted ceiling in good condition normally does not. New plaster needs a thinned mist coat to soak in and seal it; new plasterboard needs a primer or mist coat over the taped joints so they do not show through; and water stains or nicotine need a stain-blocking primer, because they bleed through ordinary emulsion however many coats go on.
Preliminary estimate, not certified engineering. This tool produces an indicative quantity calculation for planning purposes only — it is not a certified structural analysis, a guaranteed material takeoff, or a substitute for building department approval. Always verify measurements on-site and have a licensed contractor or structural engineer review any load-bearing, code-sensitive, or safety-critical work before purchasing materials or starting construction. Spotted an arithmetic or standards error? Report it to contact@craftquantities.com with your inputs — a confirmed fix gets a permanent check of its own, so the same mistake cannot come back.