Trim and door paint calculator
Doors, baseboard length and windows: you get the area to paint, quarts or litres and cans of trim enamel.
Purchase quantity
0.988 gal
Net measurement: 0.898 gal · Waste 10 %
- Enamel / trim paint5 bucket
- Area to paint219.476 ft²
- Litres with waste0.988 gal
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How it's calculated (visible formula)
area = doors × (2 sides × 17.4 sq ft + 6.5 sq ft frame) + baseboard × 4 in + windows × 10.8 sq ft; paint = area ÷ coverage × coats
- Net geometric measurement, no waste.
- Adjustable waste % for cuts and breakage.
- Purchase rounded up to sellable units (boxes, bags, buckets, boards).
How to calculate it, step by step
- Count doors (both sides) and frames.
- Measure baseboard length.
- Count windows with trim.
- Work out area and quarts of enamel.
- Round up to cans.
Worked example: 4 doors, 98 ft of baseboard, 2 windows
- ≈ 20.4 m² (220 sq ft)
- ÷ 12 m²/l × 2 = 3.4 l; +10% ≈ 3.7 l
→ About 4 quarts (one gallon).
Common mistakes
- Not sanding and degreasing old gloss.
- Latex over oil without a bonding primer.
- Heavy coats that sag.
Pro tips
- Scuff-sand and degrease old gloss so paint bonds.
- Remove hardware instead of taping around it.
- Use a foam roller on flat surfaces and a brush on profiles.
- Paint doors flat on sawhorses if you can.
From calculation to quote
Add labor, overhead and your margin, and generate the professional PDF.
FAQs
- Latex or oil for trim?
- Waterborne alkyds level well and don't yellow.
- How many coats?
- Two thin coats, lightly sanding between.
- How much does a quart cover?
- About 100 sq ft per coat.
- Gloss or semi-gloss for trim?
- Semi-gloss: durable and hides imperfections better than gloss.
- How much paint for a door?
- About a pint for two coats on both sides and frame.
- How do I avoid brush marks?
- Use a self-leveling enamel, a good brush and don't overwork it.
Sources and standards
Maintained by Srikanta M · Formula v1.0.0 · Verified 2026-09-10 · Updated 2026-09-10 · Limits: quantity estimation, not structural design or site supervision.