Paint & Wallpaper Calculator
Enter your room dimensions and material details. Get exact quantities in seconds—same math we use in the SiteScope app.
1 Room Dimensions
2 Openings (deducted from paintable area)
21 sq ft each (3 × 7 ft)
15 sq ft each (3 × 5 ft)
3 Surface & Paint Details
Rough surfaces absorb more paint, reducing effective coverage per gallon.
From product label. Typical: 350–400 sq ft/gal.
10% brush/roll · 15–20% spray
4 Primer (optional)
PVA primer: ~250 sq ft/gal (penetrates more)
Results
Rounded up to the nearest whole gallon. Order in 5-gal pails when possible — typically 10–15% cheaper per gallon.
These estimates use the same formulas as the SiteScope app. Actual quantities depend on wall conditions, installer technique, and product specifications. Always verify with your supplier before ordering.
SiteScope does this wall by wall—from a 3D scan.
Scan a room with your iPhone or iPad Pro's LiDAR, assign materials to walls in the floor plan view, and SiteScope calculates quantities per wall with openings already deducted. Primer, coats, surface type, and coverage applied automatically per SKU. Export to CSV or PDF before you leave the site.
- Per-wall breakdown with finish + primer gallons separate
- Surface type and deep-base coats applied per SKU
- 5-gal pail breakdown and SKU-level totals in the takeoff tab
- Your cost, charge, and margin—applied to every line
Related Guides
How to Calculate Paint for a Room (The Right Way)
The formula, worked example, and what changes your calculation.
Wallpaper Calculator: How Many Rolls Do You Need?
Pattern repeat, roll yield, and the professional buffer rule.
Butt Seam vs. Overlap Seam: How Seam Type Changes Your Strip Count
Why commercial vinyl uses an overlap seam and how it affects your roll count.