1. What is a Wallpaper Calculator?

Definition: This calculator estimates the number of wallpaper rolls needed based on the total wall area and the coverage area per roll.

Purpose: It helps homeowners and interior designers determine how much wallpaper to purchase for a room or project.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

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

Explanation: The total area is divided by the coverage per roll, and the result is always rounded up since you can't buy partial rolls.

3. Importance of Accurate Wallpaper Calculation

Details: Proper calculation prevents over-purchasing (wasting money) or under-purchasing (risk of dye lot differences).

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 wall area?
A: Measure each wall's height and width, multiply to get area, then sum all walls. Subtract windows/doors if large (>10 sq ft).

Q2: What's a typical roll coverage?
A: Standard rolls cover about 30 sq ft, but check manufacturer specs as this can vary (25-36 sq ft is common).

Q3: Should I add extra for pattern matching?
A: Yes, add 10-20% more for pattern repeat and mistakes, especially for large patterns.

Q4: What about doors and windows?
A: You can subtract large openings (over 10 sq ft) from your total area calculation.

Q5: How do I account for waste?
A: Consider adding 15% to your calculated rolls for cutting waste and future repairs.