Hang Wallpaper Accurately,
Account for Pattern Repeat.
Free wallpaper calculators: rolls needed by wall size and roll type, pattern-repeat waste, paste quantities, and accent-wall math. No sign-up.
Vertical Repeat Drop Waste
Patterns with 18"–24" repeats lose up to 25% length per strip to match horizontal registration.
US Double Roll vs Euro
US double rolls yield ~56 sq ft (~48 usable); Euro single rolls yield ~28 sq ft.
Strip Count Method
Calculate exact strips across wall width instead of rough square footage to ensure full heights.
WallpaperRoll Calculators
Wallpaper Roll Calculator
Rolls needed from wall dimensions and roll size — drops, cuts per roll, and the buy margin.
Pattern Repeat Waste Calculator
How much usable paper the repeat actually costs — cuts per roll, waste percentage, and the drop-start strategy.
Wallpaper Paste & Supplies Calculator
Paste packets by roll count and paper type — plus seam roller, smoother, and knife supplies.
Accent Wall Calculator
Rolls for one feature wall — width-based drops, centered layout, and the pattern centering trick.
Building Code & Methodology
How Pattern Repeat Eats Rolls (With Real Numbers)
The repeat allowance is the hidden line in every wallpaper order. Straight, drop, and random matching — with the waste percentages to expect.
Peel-and-Stick vs Paste-the-Wall: The Real Decision Math
Convenience has a price per roll and a failure mode. Where each format wins, with the numbers and the wall-condition caveats.
Measuring for Wallpaper: The Discipline That Saves Dye Lots
Perimeter not area, drop-counting not square feet, and the three measurements that decide the order.