Wallpaper Calculator

Estimate wallpaper rolls for your room

Room Length ft Length of the room

Room Width ft Width of the room

Ceiling Height ft Height of walls

Roll Length ft Standard: 33 ft

Roll Width in Standard: 20.5 in

Pattern Repeat in 0 for random match

Wall Area

—

sq ft

Strips per Roll

—

strips

Total Strips Needed

—

strips

Rolls Needed

—

rolls

Disclaimer: Results are estimates based on standard formulas. Not a substitute for professional advice from a licensed contractor, engineer, or architect. Verify all calculations before making purchasing or construction decisions.

How to Use This Calculator

Wallpaper estimation is trickier than paint because of pattern matching. Our calculator accounts for pattern repeat.

Measure room dimensions
Check wallpaper roll specs
Enter measurements
Buy all rolls from same dye lot

Expert Insights Smart analysis for your Painting project

🎨

Paint Quality ROI

Premium paint ($50+/gal) covers 20-30% more area per gallon and lasts 7-10 years vs 3-5 for budget. AI calculates true cost-per-year.

🖌️

Primer Optimization

Painting over dark colors or bare drywall? AI recommends primer to save up to one full coat of paint — cutting project cost by 20-30%.

⏱️

Labor vs DIY Comparison

Professional painters average 2-3x faster. AI compares your room size against national labor rates for an accurate DIY savings estimate.

Calculation Formula

Wall area = 2 x (L + W) x H Strips = Perimeter / Roll width Strips per roll = Roll length / (Height + Pattern repeat)

Paint Quality Comparison

Quality Tier	Price/Gallon	Coverage/Gallon	Lifespan	Best For
Economy	$15-25	250-300 sq ft	2-4 years	Rental touch-ups
Standard	$30-45	300-400 sq ft	5-7 years	Most interior walls
Premium	$50-80	350-450 sq ft	7-10+ years	High-traffic, exteriors

Authority References

Our calculations are based on guidelines and standards from these authoritative sources:

Paint Quality Institute — Coverage Rates & Application Guidelines. Learn more
Sherwin-Williams — Paint Calculator & Coverage Charts. Learn more
Benjamin Moore — Painting Best Practices Guide. Learn more

Frequently Asked Questions

How many rolls of wallpaper do I need?

A standard US double roll (33 ft x 20.5 in) covers about 56 sq ft. For a 12x10 room with 8 ft ceilings, you need approximately 6-8 double rolls.

What is pattern repeat?

Pattern repeat is the vertical distance before the pattern repeats. Large repeats waste more paper for matching.