Wallpaper Calculator

Calculate wallpaper rolls needed based on room dimensions

Project Details
Enter your measurements and requirements
Results
Calculated estimates for your project
Wall Area0 sq ft
Coverage per Roll57.8 sq ft
Rolls Needed (with waste)0

Additional Information

About This Wallpaper Calculator

Our wallpaper calculator helps you determine how many rolls of wallpaper you need based on your room dimensions and roll specifications. The calculator accounts for standard waste factors to ensure you have enough material for pattern matching and cuts around doors and windows.

Wallpaper rolls come in various widths (most commonly 21" and 27") and lengths (typically 27-33 feet). The calculator uses your specific roll dimensions to provide accurate estimates. A 15% waste factor is included for pattern matching and trimming around obstacles.

This tool is perfect for DIY decorators planning an accent wall or full room wallpapering, interior designers preparing material lists, and anyone asking "how many rolls of wallpaper do I need?" Remember that patterns with large repeats may require additional material.

How to Use This Calculator

Follow these steps to calculate your wallpaper needs:

  1. Measure your room's length and width in feet
  2. Measure the wall height from floor to ceiling
  3. Enter the roll width in inches (check product specifications)
  4. Enter the roll length in feet (from product label)
  5. Review the number of rolls needed including waste factor
Frequently Asked Questions

How many rolls of wallpaper do I need for a 12x12 room?

A 12x12 room with 8-foot ceilings has about 384 square feet of wall space. With a standard double roll (56 sq ft coverage), you'd need 7-8 double rolls. Subtract about half a roll for each door and window. Add extra for pattern matching if using patterned wallpaper.

What's the difference between single and double rolls?

Wallpaper is priced per single roll but typically sold in double rolls. A single roll covers about 28 square feet; a double roll covers about 56 square feet. When shopping, check whether prices are per single or double roll to compare accurately. Most patterns only come in double rolls.

How much extra wallpaper do I need for pattern matching?

Random match or solid patterns need 10-15% extra. Straight match patterns need 15-20% extra. Drop match patterns (offset repeats) need 20-25% extra. Larger pattern repeats require more waste - if the repeat is 24"+, add an extra roll or two beyond the calculated amount.

Can I wallpaper over existing wallpaper?

It's possible but not recommended. Old wallpaper can bubble, peel, or show through. If you must paper over, ensure the old paper is smooth, firmly adhered, and sealed with primer. Best results come from removing old wallpaper with a steamer or remover solution and properly preparing the wall.

Do I need to prime walls before wallpapering?

Yes, always prime walls with wallpaper primer (not regular paint primer). It seals the wall, prevents paste absorption, and makes future removal easier. New drywall especially needs primer - the paper facing will tear if you try to remove wallpaper from unprimed drywall.

How much does wallpaper installation cost?

Professional wallpaper installation costs $25-75 per roll, or $3-9 per square foot. Complex patterns, high ceilings, or detailed trim work increase costs. DIY installation saves labor costs but requires patience and proper tools. Budget wallpaper ($20-50/roll) to luxury ($100-300/roll) affects total project cost significantly.

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