Trim and Door Paint Calculator
How much paint for baseboards, casing and interior doors? Count the doors and the linear feet of trim, pick the finish and brand, and get gallons and cost as a range.
Measure baseboards, window and door casing. A typical room has 40–60 linear ft.
Paint for 126 sq ft of doors + 60 sq ft of trim
1.00–1.25 gal — 3.8–4.7 L
$26–$72 — estimated paint cost
Total paintable area: 186 sq ft (17.3 sq m) — 126 sq ft of door faces plus 60 sq ft of trim at a 6-inch face width. Coverage: 300–400 sq ft/gal. Trim is usually painted semi-gloss or gloss so it wipes clean; one quart often covers a whole room's trim, so check the low end before buying a gallon.
Estimate — check the can label and current shelf price. Coverage varies by brand, finish and surface, and prices vary by store and region. The range above is a planning figure, not a quote.
Formula used: Door area = doors × 21 sq ft × sides. Trim area = linear ft × 0.5 ft. Gallons = total area × coats ÷ coverage, rounded up to the nearest quart.
How this estimate works: A standard interior door is about 21 sq ft per side, and trim is counted by its face width (about 6 inches for baseboard plus casing). The two areas are added, multiplied by coats, and divided by the coverage range for your surface and finish — wood trim at semi-gloss sits near the middle of the range.
How the trim and door paint calculator works
A standard interior door is about 21 sq ft per side, and trim is counted by its face width — about 6 inches for baseboard plus casing. The two areas are added, multiplied by coats, and divided by the coverage range for your surface and finish. Trim is usually painted semi-gloss or gloss so it wipes clean, and one quart often covers a whole room's trim, so check the low end of the range before buying a gallon. Estimate — check the can label and current shelf price.
Try next: Paint Calculator · Paint Cost Calculator · Ceiling Paint Calculator
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