Wallpaper Calculator
Calculate wallpaper by full-height drops so roll length and vertical pattern repeat are accounted for.
Results
Full-height drops
—
Cut length per drop
—
Drops per roll
—
Rolls required
—
Check whether your retailer labels products as single, double or metric rolls and enter the physical dimensions printed on the product.
How it works
The calculator finds the number of full-width drops, adjusts each drop length for trim and vertical repeat, finds how many complete drops fit on one roll, then rounds up the roll count.
rolls = ceil(required drops ÷ full drops per roll)Worked example
For 40 ft of wall at 8 ft high, a 20.5 in × 33 ft roll, no pattern repeat and 4 in trim allowance, the estimate is 24 drops and 8 physical rolls.
Assumptions
- Walls are treated as having a consistent height.
- The repeat entered is the vertical pattern repeat.
Limitations
- Large pattern matching, damaged lengths, obstacles and product-specific matching rules can increase the amount required.