1 Your walls

Type feet and inches the way you'd write them, like 12' 6" or 30 3/8. Decimals work too.

ft
Add up the width of every wall you're papering.
ft
in
On the roll label. Use 0 for plain or random-match paper.
in
Extra at the top and bottom for trimming.
ft
$

2 What to buy

Rolls to buy
8
20.5" × 33 ft (standard US roll)
Strips
24
3 per roll
Strip length
105"
wall + trim, in whole 21" repeats
Strips across the walls27, less 3 full strips over doors and windows
Strips per roll3 (396" roll ÷ 105" strip, rounded down)
Rolls24 ÷ 3 = 8
Wall area368 sq ft (each roll is 56.4 sq ft before trimming)

Buy every roll from the same batch (lot) number, since colors vary slightly between print runs. Sherwin-Williams suggests buying an extra roll for repairs and mistakes.

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