Home Back

How Much Wallpaper is Needed Calculator

Wallpaper Formula:

\[ R = \lceil \frac{A}{Roll\_A} \rceil \]

ft²
ft² per roll

Unit Converter ▲

Unit Converter ▼

From: To:

1. What is a Wallpaper Calculator?

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

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

2. How Does the Calculator Work?

The calculator uses the formula:

\[ R = \lceil \frac{A}{Roll\_A} \rceil \]

Where:

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 (risking pattern mismatch between batches).

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: Multiply wall height by width for each wall, then sum all areas. Subtract windows/doors if they cover > 10 sq ft.

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

Q3: Should I add extra rolls?
A: Yes, add 10-15% extra for pattern matching, mistakes, and future repairs.

Q4: What about pattern repeat?
A: Complex patterns require more wallpaper - multiply result by 1.2-1.3 for large repeats.

Q5: How do I account for doors/windows?
A: Subtract only large openings (>10 sq ft each) from total area.

How Much Wallpaper is Needed Calculator© - All Rights Reserved 2025