Wallpaper Calculator

Wallpaper Calculator

Single and double roll counts for any room. Accounts for doors, windows, ceiling height, and pattern repeat waste.

The Short Answer: A standard single roll of wallpaper covers about 27 usable square feet (after trimming waste). A 12 × 14-foot room with 8-foot ceilings, 1 door, and 2 windows needs about 10 single rolls or 5 double rolls. Pattern repeat adds 15% to that count.

Wallpaper Calculator

Wall area
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Single rolls
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Double rolls
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US single roll: ~36 sq ft gross, ~27 sq ft usable after trimming. Double rolls: ~72 sq ft gross, ~54 sq ft usable. Most US wallpaper is now sold in double rolls priced as two singles. Pattern repeat adds ~15% waste.

How to Calculate Wallpaper

Wallpaper estimation starts with the wall area: room perimeter × ceiling height, minus doors and windows. Then factor in the roll's usable coverage (not gross — you lose material to trimming, matching, and the top/bottom of each strip) and pattern repeat waste.

Pattern Repeat and Waste

A "pattern repeat" is the vertical distance before the design repeats. A 21-inch repeat means every strip must be aligned so the pattern matches at the seam — which wastes material on every cut. No repeat (solid or random pattern) = minimal waste. A 21-inch repeat on 8-foot walls = about 15% extra material. The calculator adds this automatically when you enter a repeat value.

Single Rolls vs. Double Rolls

This is genuinely confusing, and the wallpaper industry hasn't helped. In the US, wallpaper is manufactured in double rolls but priced per single roll. When you buy "8 single rolls," you're actually getting 4 physical double-roll bolts. The calculator shows both so you can communicate clearly with the retailer.

Frequently Asked Questions

Enter your room dimensions above — the calculator returns both single and double roll counts. As a rough guide: a standard 12 × 12-foot room with 8-foot ceilings needs about 8–10 single rolls (4–5 double rolls) for a pattern without repeat. Add 15% for patterned wallpaper with a repeat.

A US standard single roll contains about 36 square feet of paper, but only about 27 square feet is usable after trimming top, bottom, and edges. A double roll has about 72 square feet gross, ~54 usable. European rolls are larger — about 57 usable square feet per roll. Always use the usable figure, not the gross, when estimating.

The Bottom Line

Wallpaper estimation is less forgiving than paint — you can't just buy another quart if you run short. Dye lots vary between production runs, so all your rolls need to come from the same batch. Order 1–2 extra rolls beyond what the calculator shows, especially with patterned paper. Returns of unopened rolls are usually accepted; running short of a discontinued pattern is not fixable. Measure carefully, account for pattern repeat, and order generously.

Paint Calculator

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Wall surface preparation before wallpapering.

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