HomeExpertly
www.homeexpertly.com

Exterior Paint Calculator

Estimate how much exterior paint your house needs — wall gallons by siding type and coats, plus primer and trim/door paint — with U.S. pricing, a coats comparison, and a downloadable PDF shopping list.

Coverage depends heavily on siding texture, porosity, and color change. Rough surfaces drink paint. Estimates use 2024-2025 U.S. prices. For planning purposes only.

House & Paint
1 House Walls
ft
×
ft
Walk the base of the house for perimeter. 1 story ≈ 10 ft, 2 story ≈ 18-20 ft.
sq ft
sq ft
Each gable triangle ≈ 0.5 × width × peak height
win
doors
Counted at ~15 sq ft per window, ~20 sq ft per door
2 Surface & Coats
2 coats is standard for exterior durability & even color
sq ft/gal
Auto-set by siding type; check the can (rough surfaces cover less)
sq ft/gal
Prime bare wood, patched spots, or a drastic color change
3 Trim, Doors & Cost
ft
Rough guide: about 2× the house perimeter
in
sq ft/gal
$/ gallon
U.S. exterior paint ~$35 - $70 per gallon
$/ gallon
$/ gallon
$/ sq ft
Pro exterior painting ~$1.50 - $4 per sq ft. Set 0 for DIY.
Paint Estimate
Total Paint To Buy
—
Enter your house to begin
Wall Gallons —
Net Wall Area —
Primer Gallons —
Full Cost Breakdown
Net wall area —
Wall paint —
TOTAL ESTIMATE—
Total cost / sq ft —
Trim Gallons —
Paint labor —
Cost Breakdown Chart
Estimated cost by category ($)
Coats Comparison — Your Walls
CoatsWall AreaWall GallonsWall Paint Cost

For your 1,500 sq ft of wall at 350 sq ft/gal, $45/gal.