Wallpaper Calculator – Simple, Accurate Roll Estimates
This wallpaper calculator helps you quickly work out how many wallpaper rolls you need for a room. Enter your room’s length, width, and wall height; we calculate the wall area (2 × (L + W) × H), subtract standard door and window areas, and factor in pattern repeat to determine how many full-height strips you’ll get from each roll. It supports both metric and imperial units and common roll sizes.
How the Calculator Works
We use a strip-based method for accuracy. The effective strip length is your wall height rounded up to the next pattern repeat,
so patterned designs get the extra allowance they need. Strips per roll = floor(roll_length Ă· effective_strip_length).
Coverage per roll = strips_per_roll Ă— roll_width Ă— wall_height (we count usable wall area, not waste).
Total rolls = ceil(net_wall_area Ă· coverage_per_roll).
Practical Tips
- Buy an extra roll if possible. Shade/batch numbers can vary; a spare ensures perfect future touch-ups.
- For bold patterns, a larger pattern repeat means more waste per strip—check the label before purchasing.
- Let rolls acclimate and follow the manufacturer’s paste-the-wall or paste-the-paper instructions.
- Store unused rolls flat and dry; label them with the room and date.
Related Calculators
- Paint Calculator – planning a base coat or painting adjoining rooms?
- Tile Calculator – useful for bathrooms or kitchen renovations.