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Wallpaper Calculator

Estimate full-height strips and rolls while allowing for trim, pattern repeats and half-drop matching.

Your numbers

Make it your own
Updates as you type
Wallpaper rolls to order
5rolls

Calculated from your inputs · rounded for display

Full-height strips12
Conservative cut length100in
Usable strips per roll3
Roll material cost$200.00

One continuous wall with full-height strips; openings are not subtracted. Half-drop calculation is conservative and assumes no offcut sharing. Enter physical single-roll dimensions even if sold in bundles.

Your calculation, step by step

No black boxes
  1. Strip count = ceil(wall width / roll width).
  2. Round height + total trim up to a full pattern repeat, then allow 0 inches between successive cuts for half-drop matching.
  3. Rolls = ceil(strips / strips per roll × waste factor).

What if things were different?

Save up to three scenarios, then change your inputs to compare the possibilities.

How to use this calculator

  1. Enter your own values in the labeled fields. Check the units and assumptions before comparing results. Only the fields needed for your selected calculation mode are shown.
  2. Your answer updates automatically. Review the calculation steps to see exactly how it was calculated.
  3. Copy, share, save, or download your result. Saved inputs stay on this device.

How the calculation works

Strips=ceil(wall width/roll width); rolls=ceil(strips/usable strips per roll × allowance)

Full-height strips are counted without subtracting windows or doors. Cuts round up to a full pattern repeat. Half-drop mode adds a conservative half-repeat allowance between cuts; optimized alternating rolls may use less. Enter dimensions for a physical roll, not the package label. Review the units, period and assumptions before comparing scenarios. Displayed values are rounded, while the underlying calculation retains its available precision.

A worked example

A 10-ft-wide, 8-ft-high wall with 24-inch-wide, 32-ft-long rolls and no trim, repeat or waste needs 5 strips, 4 per roll, or 2 rolls.

Reading your result

Use the main result together with its units and supporting figures. Display values are rounded; calculations keep their underlying precision. A change in inputs or assumptions can change the answer. Compare the step-by-step working with your intended use before relying on an estimate.

Frequently asked questions

What assumptions does this calculation use?

Full-height strips are counted without subtracting windows or doors. Cuts round up to a full pattern repeat. Half-drop mode adds a conservative half-repeat allowance between cuts; optimized alternating rolls may use less. Enter dimensions for a physical roll, not the package label.

Can I save or check a scenario?

The result includes the working and supporting values. Save and Restore keep inputs on this device; Copy, Download and Print export the result. Sharing a scenario explicitly includes the inputs in its link.

Sources & methodology

This calculator uses the mathematical identity and assumptions stated above. No current rates, prices, or external data are loaded. Conversion tools use international unit definitions.

Formula review: October 24, 2026. Read our methodology.