Planning estimates only. Check product coverage, pack sizes, and your measurements before buying.
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A strip-based estimate
Measure the wall width and height. Use the roll dimensions on the label, including whether the retailer sells single or double rolls. This tool adds trimming allowance and rounds strip lengths to your entered vertical repeat. For half-drop matches, consult the supplier.
A worked example
A 12 ft wide, 8 ft high wall needs 8 strips of 20.5-inch paper. With 4 inches of trimming allowance, a 33 ft roll yields 3 full strips. That means 3 rolls before any spare rolls.