Wallpaper Calculator: How Many Rolls Do I Need?

1. Strips. 48 ft of wall = 576 in, minus a 36 in door and half a 36 in window = 522 in. 522 / 20.5 = 26 strips.
2. Cut length. 96 in wall + 4 in trim = 100 in. For a 21 in half-drop each strip uses 115.5 in of roll.
3. Strips per roll. 396 in / 115.5 in = 3 whole strips.
4. Rolls. 26 / 3 = 9 rolls, 10 with a spare.

Dividing 384 sq ft of wall by 56 sq ft a roll says 7 rolls. But a roll only yields whole strips: the last few feet after the third 8 ft strip are too short for another wall-height drop, and every strip has to start at the same point in the pattern. Those leftovers can cover the space over a door, never a full wall. That is why this calculator counts strips first.

• Random or free match: stripes, textures and grasscloth. Strips can start anywhere, so the only waste is trim.
• Straight match: the pattern lines up at the same height across every seam. Each strip uses the drop rounded up to the repeat.
• Half-drop: every other strip starts half a repeat lower. Cut from one roll, you skip half a repeat between strips. See the pattern repeat calculator for repeat tables.

Check the batch or lot number on every roll before you hang the first strip; rolls from different runs can differ in color. Measure like a pro: measure each wall at the widest point, use the tallest height, and count every door and window.