1. What is a Wallpaper Calculator with Pattern Repeat?

Definition: This calculator estimates the number of wallpaper rolls needed for a wall, accounting for pattern matching requirements.

Purpose: It helps homeowners and interior designers accurately purchase wallpaper while considering pattern alignment.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

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

Explanation: The pattern repeat reduces the usable length of each wallpaper strip, requiring more rolls to cover the same height.

3. Importance of Pattern Repeat Calculation

Details: Proper calculation ensures you purchase enough wallpaper to match patterns across all strips, preventing mismatches and project delays.

4. Using the Calculator

Tips: Enter wall dimensions, roll specifications, and pattern repeat. Standard roll size is 33ft long × 1.75ft wide (European standard).

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: What if my wallpaper has no pattern repeat?
A: Enter 0 for pattern repeat, and the calculator will use the full roll height.

Q3: Why do we round up the calculations?
A: Because you can't purchase partial rolls, and pattern matching often requires extra length for alignment.

Q4: Does this include waste for mistakes?
A: No, consider adding 10-15% extra for mistakes, especially with complex patterns.

Q5: How do I measure pattern repeat?
A: Check the wallpaper label or measure the distance between identical points in the pattern.