1. What is a Wallpaper Calculator?

Definition: This calculator determines the number of wallpaper rolls required based on your wall area and the coverage provided by each roll.

Purpose: It helps homeowners, decorators, and contractors accurately estimate wallpaper needs for any room.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

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

Explanation: The total wall area is divided by the coverage per roll, and the result is always rounded up to ensure you have enough wallpaper.

3. Importance of Accurate Wallpaper Calculation

Details: Proper calculation prevents under-ordering (which can lead to mismatched patterns between batches) and over-ordering (which wastes money).

4. Using the Calculator

Tips:

• Measure your wall area carefully (height × width for each wall)
• Subtract window/door areas from total
• Check the coverage per roll (standard is 30 ft² but varies)
• Consider adding 10-15% extra for pattern matching and errors

5. Frequently Asked Questions (FAQ)

Q1: Why round up the number of rolls?
A: You can't purchase partial rolls, and rounding up ensures you have enough material to complete the job.

Q2: What's the standard coverage per roll?
A: Most standard wallpaper rolls cover about 30 square feet, but this varies by brand and pattern.

Q3: How do I account for pattern repeats?
A: Add 10-20% more rolls for large pattern repeats, as more material is wasted when matching patterns.

Q4: Should I include windows and doors in my wall area?
A: Measure the full wall area first, then subtract window/door areas (typically 15-20 sq ft per opening).

Q5: How much extra should I buy for mistakes?
A: Professionals recommend buying 15-20% more than calculated, especially for complex patterns or if you're inexperienced.