How is wallpaper quantity calculated?

Total wall area divided by a single roll's coverage, accounting for pattern repeat.

Why does pattern repeat affect how much wallpaper I need?

Patterns needing alignment across strips often require extra material.

Should I order extra rolls?

Yes, one extra roll is common for cutting errors and dye-lot consistency.

Wallpaper Calculator - How Many Rolls Do You Need?

Wallpaper Calculator

Find out exactly how many rolls of wallpaper you need for your room.

Wall Width (m)

Wall Height (m)

Number of Walls

Roll Width (m)

Roll Length (m)

Waste Allowance (%)

Total Wall Area0 m²

Area per Roll0 m²

Rolls Needed0

How the Wallpaper Calculator Works

Buying the right number of wallpaper rolls saves you money and prevents mid-project trips back to the store. This calculator works out your total wall area, divides it by the coverage area of a single roll, and adds a waste allowance to account for pattern matching, trimming, and cutting around doors or windows.

How to Use This Calculator

Enter the width and height of one wall (in meters).
Enter the number of walls you're papering (use 4 for a full room, adjust as needed).
Enter your wallpaper roll's width and length — standard rolls are about 0.53m × 10m.
Set a waste allowance percentage (10–15% is typical, more for patterned paper).
Click "Calculate Rolls Needed" to see exactly how many rolls to buy.

Formula Used

Total Wall Area = Wall Width × Wall Height × Number of Walls

Rolls Needed = ROUND UP [ (Total Wall Area × (1 + Waste%)) ÷ (Roll Width × Roll Length) ]

Worked Example

For 4 walls each 4m wide and 2.5m high: Total Area = 4 × 2.5 × 4 = 40 m². With a standard roll of 0.53m × 10m = 5.3 m² per roll, and a 10% waste allowance: Rolls Needed = (40 × 1.10) ÷ 5.3 = 44 ÷ 5.3 ≈ 8.3, which rounds up to 9 rolls.

Deduct large door and window areas for a more precise estimate, and always round up to the nearest whole roll.