Wallpaper Calculator
Calculate how many wallpaper rolls you need for your room, including pattern repeat
Calculate Wallpaper Requirements
Room Dimensions
Length of the room
Width of the room
Height of the room
Doors
Standard: 200 cm
Standard: 90 cm
Windows
Standard: 120 cm
Standard: 90 cm
Wallpaper Specifications
Length of one wallpaper roll
Width of one wallpaper roll
Vertical distance between pattern repeats (0 if no pattern)
Cost of one wallpaper roll (optional)
Wallpaper Requirements
Please Complete Required Fields
- ⚠️Please enter room dimensions or surface area
- ⚠️Please enter wallpaper roll specifications
- ⚠️Pattern repeat cannot be larger than room height
- ⚠️Total openings area cannot exceed wall area
Surface Area Breakdown
Pattern Adjustment
Formulas used:
Gross Area: A = 2 × (length + width) × height
Adjusted Height: h_adj = ceil(height / pattern_repeat) × pattern_repeat
Number of Rolls: N = ceil(adjusted_area / roll_area)
Example Calculation
28 m² Room with 6×1.5m Rolls
Room: 4m × 3.5m × 2.5m height
Doors: 2 doors (2m × 0.9m each)
Windows: 2 windows (1.2m × 0.9m each)
Wallpaper: 6m length × 1.5m width rolls
Pattern Repeat: 0.32m (32cm)
Calculation Steps
1. Gross Area = 2 × (4 + 3.5) × 2.5 = 37.5 m²
2. Doors Area = 2 × (2 × 0.9) = 3.6 m²
3. Windows Area = 2 × (1.2 × 0.9) = 2.16 m²
4. Net Area = 37.5 - 3.6 - 2.16 = 31.74 m²
5. Adjusted Height = ceil(2.5/0.32) × 0.32 = 8 × 0.32 = 2.56m
6. Adjusted Area = (31.74 / 2.5) × 2.56 = 32.5 m²
7. Roll Area = 6 × 1.5 = 9 m²
8. Rolls Needed = ceil(32.5 / 9) = 4 rolls
Installation Tips
Measure Carefully
Double-check all measurements before ordering
Use our calculator for accurate estimates
Check Pattern Match
Account for pattern repeat in calculations
Higher repeat = more waste
Buy Extra
Add 10% for trimming and future repairs
Same batch ensures color consistency
Plan Installation
Start from focal wall, work outward
Hide seams in corners when possible
Pattern Repeat Guide
No Pattern (0cm)
Plain colors or random textures
Small Repeat (10-25cm)
Minimal waste, easy to match
Medium Repeat (25-50cm)
Moderate waste, plan carefully
Large Repeat (50cm+)
High waste, consider room height
Tip: Pattern repeat information is usually printed on the wallpaper label or packaging.
Understanding Wallpaper Calculations
Why Pattern Repeat Matters
Pattern repeat is the vertical distance between identical elements in the wallpaper design. This affects how much wallpaper you need because you must align patterns when hanging strips.
Surface Area Calculation
- •Gross Area: Total wall surface (2 × (length + width) × height)
- •Net Area: Gross area minus doors and windows
- •Adjusted Area: Net area plus pattern repeat waste
Calculation Formulas
Gross Area:
A = 2 × (length + width) × height
Adjusted Height:
h_adj = ceil(height / repeat) × repeat
Number of Rolls:
N = ceil(adjusted_area / roll_area)
Pro Tip: Always buy 10% extra wallpaper for trimming, complex cuts, and future repairs. Keep spare rolls for touch-ups.
Common Wallpaper Sizes
European Standard
10m × 0.53m rolls (5.3 m² coverage). Most common in Europe and UK.
American Standard
20.5" × 16.5' rolls (approximately 2.5 m² coverage). Common in North America.
Commercial Grade
Various sizes, often 25-30m length × 0.9-1.37m width for large spaces.