How much extra wallpaper should I order for pattern matching?

Add 10-15% extra wallpaper for pattern matching and mistakes. Larger pattern repeats require more extra material to ensure proper alignment across all strips.

How do I handle pattern matching during wallpaper installation?

Consider the pattern repeat in your calculations. Align patterns across adjacent strips and plan your cuts to minimize waste while maintaining pattern continuity.

What about wallpaper installation around corners and obstacles?

Add extra wallpaper for corner overlaps and around obstacles like electrical outlets. Complex room shapes may require additional material for proper coverage.

How do textured walls affect wallpaper requirements?

Textured walls may require more wallpaper due to the additional material needed to fill surface irregularities. Consider using a wallpaper liner for heavily textured surfaces.

How do I handle sloped ceilings or angled walls?

Measure the actual wall height at various points for sloped ceilings. Use the maximum height in your calculations to ensure adequate coverage for the entire wall surface.

Wallpaper Calculator

Room Parameters

Room Length

Room length

Room Width

Room width

Room Height

Room height

Number of Doors

Standard door size: 7' x 3'

Number of Windows

Standard window size: 3' x 4'

Pattern Repeat

Pattern repeat length

Roll Width

Wallpaper roll width

Roll Length

Wallpaper roll length

Calculation Results

Wallpaper Calculator: Your Guide to Wallpaper Installation

Need to calculate how much wallpaper you need? Our Wallpaper Calculator helps you determine the exact amount of wallpaper required for your room.

Understanding Wallpaper Calculations

Wallpaper calculations are important for several reasons:

Cost Control: Accurate material estimates
Waste Reduction: Minimize excess material
Pattern Matching: Proper pattern alignment
Installation Planning: Efficient workflow
Budget Management: Cost-effective planning

How to Use the Wallpaper Calculator

Enter Room Dimensions: Input length, width, and height
Enter Openings: Input number of doors and windows
Enter Pattern Details: Input pattern repeat length
Enter Roll Specifications: Input roll width and length
Click Calculate: Get wallpaper requirements

Wallpaper Calculation Formulas

Wall Area:
A = 2 × (L + W) × H

Opening Area:
O = (D × 21) + (W × 12)

Net Wall Area:
N = A - O

Roll Coverage:
C = (R × L) / (1 + P/R)

Number of Rolls:
R = N / C

Where:
A = Total wall area
L = Room length
W = Room width
H = Room height
D = Number of doors
W = Number of windows
O = Opening area
N = Net wall area
R = Roll width
L = Roll length
P = Pattern repeat
C = Roll coverage

Common Wallpaper Specifications

Standard Roll Sizes:
- Width: 20.5 inches
- Length: 33 feet
- Coverage: 56 sq ft
- Pattern Repeat: 0-24 inches
European Roll Sizes:
- Width: 21 inches
- Length: 33 feet
- Coverage: 58 sq ft
- Pattern Repeat: 0-24 inches
Metric Roll Sizes:
- Width: 52 cm
- Length: 10 meters
- Coverage: 5.2 sq meters
- Pattern Repeat: 0-64 cm
Extra Wide Rolls:
- Width: 27 inches
- Length: 27 feet
- Coverage: 61 sq ft
- Pattern Repeat: 0-24 inches

Real-World Examples

Example 1: Standard Bedroom

Room Length: 12 feet
Room Width: 10 feet
Room Height: 8 feet
Doors: 1
Windows: 1
Pattern Repeat: 12 inches
Roll Width: 20.5 inches
Roll Length: 33 feet
Results:
- Wall Area: 352 sq ft
- Opening Area: 33 sq ft
- Net Wall Area: 319 sq ft
- Number of Rolls: 6

Example 2: Living Room

Room Length: 16 feet
Room Width: 14 feet
Room Height: 9 feet
Doors: 2
Windows: 3
Pattern Repeat: 18 inches
Roll Width: 20.5 inches
Roll Length: 33 feet
Results:
- Wall Area: 540 sq ft
- Opening Area: 78 sq ft
- Net Wall Area: 462 sq ft
- Number of Rolls: 9

Frequently Asked Questions

How much extra wallpaper should I order?

Add 10-15% for pattern matching and mistakes.

What about pattern matching?

Consider pattern repeat in calculations.

How to handle corners?

Add extra for corner overlaps.

What about textured walls?

May require more wallpaper.

How to handle sloped ceilings?

Measure actual wall height.