1. What is a Wallpaper Calculator?

Definition: This calculator determines how many rolls of wallpaper are needed based on your wall area and the coverage per roll.

Purpose: It helps homeowners and decorators purchase the correct amount of wallpaper, minimizing waste and extra trips to the store.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( R \) — Rolls of wallpaper needed (rounded up)
• \( A \) — Total wall area (square feet)
• \( Roll\_A \) — Coverage per roll (square feet)

Explanation: The total wall area is divided by the coverage per roll, then rounded up to the nearest whole number since you can't buy partial rolls.

3. Importance of Accurate Calculation

Details: Proper calculation prevents purchasing too much (wasting money) or too little (risk of pattern mismatch or discontinued stock).

4. Using the Calculator

Tips: Enter the total wall area in square feet and the coverage per roll (default 30 sq ft). All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: How do I measure my wall area?
A: Multiply wall height by width for each wall, then sum all areas. Subtract windows/doors (typically 20 sq ft each).

Q2: Why round up instead of using exact calculation?
A: Wallpaper is sold in whole rolls, and you'll need extra for pattern matching and mistakes.

Q3: What's a typical roll coverage?
A: Standard American rolls cover about 30 sq ft, but European rolls often cover 25 sq ft - check your product.

Q4: Should I buy extra rolls?
A: Yes, purchase 10-15% extra for pattern matching and future repairs (store unopened rolls for returns).

Q5: How does pattern repeat affect calculations?
A: Large patterns require more waste - add 20-30% extra for patterns repeating every 12+ inches.