1. What is Wallpaper Calculation with Repeat?

Definition: This calculator determines how many wallpaper rolls are needed for a wall, accounting for the pattern repeat.

Purpose: It helps homeowners and decorators accurately estimate wallpaper quantities, minimizing waste and additional purchases.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( R \) — Number of wallpaper rolls needed
• \( H \) — Wall height (feet)
• \( W \) — Wall width (feet)
• \( Roll_H \) — Roll height (feet, typically 33ft)
• \( Roll_W \) — Roll width (feet, typically 1.75ft)
• \( Repeat \) — Pattern repeat length (feet)

Explanation: The formula accounts for the pattern repeat by reducing the usable roll height, then calculates how many strips are needed vertically and horizontally.

3. Importance of Pattern Repeat Calculation

Details: Pattern repeat significantly affects wallpaper requirements. Ignoring it may result in 10-30% underordering, especially with large repeats.

4. Using the Calculator

Tips: Enter wall dimensions, roll specifications (defaults for standard US rolls), and pattern repeat. All dimension values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What is pattern repeat?
A: The vertical distance between where the pattern matches (typically 0-24 inches). This affects how much wallpaper is wasted when matching patterns.

Q2: Why subtract repeat from roll height?
A: Each strip must be longer than the wall height to allow for pattern matching, reducing usable length per roll.

Q3: What are standard wallpaper roll sizes?
A: In US: 33ft long × 1.75ft wide (European rolls are typically 33ft × 1.97ft).

Q4: Should I add extra for mistakes?
A: Yes, add 10-15% extra to the calculated amount for trimming errors and future repairs.

Q5: What if my repeat equals roll height?
A: The calculator will show an error because no usable length remains after accounting for repeat.