How to Use the Wallpaper Calculator

Measuring for wallpaper is straightforward when you follow these steps. First, measure your wall height from floor to ceiling. Then measure the total width of all walls you want to cover (or the room perimeter). Finally, enter your wallpaper roll specifications from the product label.

Measuring Your Walls

• Wall Height: Measure from floor to ceiling. If using baseboards or crown molding, measure between them.
• Total Width: Add up the width of all walls to be covered. For a full room, measure the perimeter and subtract walls you won't cover.
• Doors & Windows: Measure height × width of each opening and enter the total area to subtract from coverage.
• Pattern Repeat: Check the wallpaper product label for the vertical repeat distance.

Understanding Pattern Repeat

Pattern repeat is the vertical distance before a wallpaper design repeats. When hanging patterned wallpaper, adjacent strips must align so the pattern matches seamlessly. This alignment requirement means each strip needs extra length, reducing the usable drops per roll.

• Solid/No Repeat (0): Maximum efficiency - full roll length is usable.
• Small Repeat (6-12 in / 15-30 cm): Minor extra material needed for matching.
• Large Repeat (18-24+ in / 45-60+ cm): Significant extra material required - factor in more waste.

Standard Wallpaper Roll Sizes

Professional Tips for Ordering Wallpaper

• Order Extra: Always add 10-15% for cutting waste, pattern matching, and future repairs.
• Same Dye Lot: Order all rolls at once from the same manufacturer batch to ensure color consistency.
• Save Leftover: Keep extra wallpaper for repairs - discontinued patterns cannot be matched.
• Check Match Type: Some patterns require "drop match" (offset alignment) which increases waste further.
• Acclimate Paper: Let wallpaper rolls sit in the room for 24-48 hours before installation.

Frequently Asked Questions

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

The number of wallpaper rolls depends on your room dimensions, roll size, and pattern repeat. Calculate your wall area (height × perimeter), subtract doors and windows, then divide by the usable coverage per roll. Add 10-15% extra for waste and pattern matching.

What is a wallpaper drop?

A drop is a single vertical strip of wallpaper cut from the roll and hung on the wall. The number of drops per roll depends on wall height and pattern repeat. For example, a 33-foot roll with 10-foot walls (no pattern) yields 3 drops per roll.

Should I buy extra wallpaper rolls?

Yes, always order 10-15% extra wallpaper. This accounts for cutting waste, pattern matching, mistakes during installation, and future repairs. Discontinued patterns cannot be replaced.