Wallpaper Calculator — Accurate & Pattern-Aware Roll Estimates
Calculate exactly how much wallpaper you need. Supports straight, half-drop, and random pattern matches.
How to Measure for Wallpaper
Step-by-Step Measuring Guide
- Measure wall height: Measure from floor to ceiling at multiple points and use the highest measurement.
- Measure wall width: Measure the full width of each wall at about chest height.
- Account for openings: Measure all doors and windows, but don’t subtract them yet – our calculator handles this.
- Check pattern repeat: If your wallpaper has a pattern, measure the vertical distance between where the pattern repeats.
Understanding Pattern Matches
None / Random Match
No pattern alignment needed between strips. Most efficient with ~10% waste.
Straight Match
Pattern aligns horizontally across strips. Requires ~12% waste for alignment.
Half-drop Match
Pattern staggers between strips. Most complex with ~18% waste needed.
Frequently Asked Questions
How much extra wallpaper should I buy?
We automatically include waste percentage based on your pattern type: 10% for random match, 12% for straight match, and 18% for half-drop match. For complex patterns or large repeats, consider adding extra.
What if my walls are irregularly shaped?
Break irregular walls into multiple rectangular sections and add each as a separate wall in the calculator.
Should I subtract doors and windows?
Our calculator automatically accounts for openings. Add them to each wall for the most accurate calculation.