1. What is a Wallpaper Calculator?

Definition: This calculator estimates the number of wallpaper rolls needed based on wall area and roll coverage, including 10% extra for waste.

Purpose: It helps UK homeowners and decorators accurately purchase wallpaper without over- or under-buying.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• Rolls — Number of wallpaper rolls needed (rounded up)
• Wall Area — Total area to be covered (square meters)
• Roll Coverage — Area one roll covers (square meters)
• 1.1 — 10% waste factor for pattern matching and errors

Explanation: The wall area is divided by roll coverage to get base quantity, then increased by 10% for waste.

3. Importance of Accurate Calculation

Details: Proper calculation prevents project delays, ensures pattern continuity, and minimizes leftover materials.

4. Using the Calculator

Tips: Enter the total wall area in m² and roll coverage (default 5.2 m² for standard UK rolls). All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: Why is there a 10% waste factor?
A: This accounts for pattern matching, trimming, and potential mistakes during installation.

Q2: What's standard roll coverage in the UK?
A: Most standard UK wallpaper rolls cover about 5.2 m², but always check the specific product.

Q3: How do I calculate wall area?
A: Measure height and width of each wall, multiply to get area, then sum all wall areas.

Q4: Should I round up the result?
A: Yes, the calculator automatically rounds up since you can't buy partial rolls.

Q5: What if my wallpaper has a large pattern repeat?
A: Consider increasing the waste factor to 15-20% for complex patterns.