1. What is a Wallpaper Calculator with Repeat?

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

Purpose: It helps homeowners and decorators accurately purchase wallpaper while accounting for pattern matching.

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 16.5 ft)
• \( Repeat \) — Pattern repeat length (feet)
• \( W \) — Wall width (feet)
• \( Roll_W \) — Roll width (feet, typically 1.59 ft)

Explanation: The formula calculates how many strips are needed vertically (accounting for pattern repeat) and horizontally, then rounds up to whole rolls.

3. Importance of Pattern Repeat Calculation

Details: Pattern repeat significantly affects wallpaper requirements. Ignoring it can lead to insufficient material and mismatched patterns.

4. Using the Calculator

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

5. Frequently Asked Questions (FAQ)

Q1: What is pattern repeat?
A: The vertical distance before the wallpaper pattern repeats, requiring extra length for proper alignment.

Q2: What are standard wallpaper roll sizes?
A: In the US: 16.5 ft long × 1.59 ft wide (European rolls differ).

Q3: How do I find my wallpaper's repeat?
A: Check the product label - it's usually between 0" (no repeat) to 24".

Q4: Why does repeat affect the calculation?
A: Each strip must start at the same pattern point, requiring extra length that reduces usable roll length.

Q5: Should I buy extra wallpaper?
A: Yes, add 10-15% for pattern matching, mistakes, and future repairs.