1. What is a Wallpaper Calculator Including Pattern Repeat?

Definition: This calculator estimates the number of wallpaper rolls needed for a wall, accounting for the pattern repeat that affects material usage.

Purpose: It helps homeowners and interior designers accurately calculate wallpaper requirements while minimizing waste from pattern matching.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( R \) — Rolls needed (rounded up)
• \( H \) — Wall height (feet)
• \( Roll_H \) — Roll height (feet, typically 33ft)
• \( Repeat \) — Pattern repeat length (feet)
• \( W \) — Wall width (feet)
• \( Roll_W \) — Roll width (feet, typically 1.75ft)

Explanation: The formula accounts for the extra wallpaper needed to match patterns by reducing the usable length of each roll.

3. Importance of Pattern Repeat Calculation

Details: Pattern repeats significantly affect material requirements. Larger repeats require more wallpaper to ensure proper pattern alignment.

4. Using the Calculator

Tips: Enter wall dimensions, roll specifications (default 33ft height × 1.75ft width), and pattern repeat length (0 for no repeat). All values must be ≥ 0.

5. Frequently Asked Questions (FAQ)

Q1: Why does pattern repeat affect the calculation?
A: Each drop must start at the same point in the pattern, meaning you lose some length from each roll to match the pattern.

Q2: What's the standard wallpaper roll size?
A: Most wallpaper rolls are 33ft long and 1.75ft wide, but European rolls may differ (check your product).

Q3: How do I find my wallpaper's pattern repeat?
A: The repeat length is printed on the wallpaper label or product specifications.

Q4: Should I order extra wallpaper?
A: Yes, add 10-15% to account for mistakes, future repairs, and pattern matching waste.

Q5: What if my wall has doors/windows?
A: For best results, calculate the total wall area and subtract door/window areas before using the calculator.