Room Measurements to Paint and Primer Quantity Estimate

Takes room measurements and the painter's own coverage numbers and works out how many gallons of paint and primer to buy for the job.

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Before and after

BEFORE · what the owner typed

Estimate for Claudia Hancock, 7789 Eastleigh St, Hollyford. I'm Damian Ingram at Finchleigh Painting. Three rooms. Living room 18 x 14, 9 ft ceilings. Two windows 3x5, one door 3x7, one wide cased opening 6x7. Walls and ceiling, 2 coats each. Old walls are dark red so primer on the walls, 1 coat. Ceiling has an old water stain so primer the ceiling 1 coat too. Hall is 12 x 4, 8 ft ceilings, three doors 3x7. Walls only, 2 coats. No ceiling. Bedroom 12 x 11, 8 ft ceilings, one window 3x4 and one door 3x7. Walls only, 2 coats, no primer, no ceiling. Same wall color in all three rooms, ceiling is white. No trim or doors this job. Take off all openings at full size. We use 350 sq ft per gallon for both paints and 300 for primer. Add 10 percent for waste on everything. We buy 1 gallon and 5 gallon cans.

AFTER · what the skill produced

Paint and primer estimate
Customer: Claudia Hancock, 7789 Eastleigh St, Hollyford
Prepared by: Damian Ingram, Finchleigh Painting

Living room (18 x 14, 9 ft ceiling)

Walls: perimeter 64 ft x 9 ft = 576 sq ft. Openings: two windows 30 sq ft, one door 21 sq ft, one cased opening 42 sq ft, total 93 sq ft. Net walls: 483 sq ft.
Ceiling: 18 x 14 = 252 sq ft.

Hall (12 x 4, 8 ft ceiling)

Walls: perimeter 32 ft x 8 ft = 256 sq ft. Openings: three doors at 21 sq ft = 63 sq ft. Net walls: 193 sq ft.
No ceiling.

Bedroom (12 x 11, 8 ft ceiling)

Walls: perimeter 46 ft x 8 ft = 368 sq ft. Openings: one window 12 sq ft, one door 21 sq ft, total 33 sq ft. Net walls: 335 sq ft.
No ceiling.

Product totals

Wall paint: 483 + 193 + 335 = 1,011 sq ft. 2 coats = 2,022 sq ft. Plus 10 percent = 2,224.2 sq ft. At 350 sq ft per gallon = 6.35 gallons, rounded up to 7 gallons.
Ceiling paint (white): 252 sq ft. 2 coats = 504 sq ft. Plus 10 percent = 554.4 sq ft. At 350 sq ft per gallon = 1.58 gallons, rounded up to 2 gallons.
Primer: living room walls 483 + living room ceiling 252 = 735 sq ft. 1 coat. Plus 10 percent = 808.5 sq ft. At 300 sq ft per gallon = 2.70 gallons, rounded up to 3 gallons.

Shopping list

Wall paint: one 5 gallon can and two 1 gallon cans (7 gallons)
Ceiling paint, white: two 1 gallon cans
Primer: three 1 gallon cans

No trim or doors are included in these numbers.

Questions for the owner

What year was the house built? If it may be older, please confirm lead-safe requirements locally with a certified professional before sanding or scraping old paint.
Do you want a stain-blocking primer for the ceiling water stain? The notes did not say which primer product to use.
Do you want a 5 gallon can of ceiling paint instead of two 1 gallon cans? You did not give prices, so I could not compare.

What it does

Takes room measurements and the painter's own coverage numbers and works out how many gallons of paint and primer to buy for the job. It shows the math room by room so the painter can check it and reuse it on a quote or shopping list.

Use it when: Use when a painter needs to turn room measurements into how many gallons of paint and primer to buy, such as: how much paint do I need, figure out gallons for this job, paint estimate from measurements, or primer quantity for these rooms.