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Wallpaper Roll Count Calculator

Calculate wallpaper roll count with labeled inputs, explicit units and the formula rolls = ceil(ceil(wall width / roll width) / floor(roll length / drop height)).

Construction workspace● Runs in your browser
01 Your input
02 Your result
YOUR RESULT
Ready when you are
Formularolls = ceil(ceil(wall width / roll width) / floor(roll length / drop height))

How to use this tool

  1. Enter each labeled measurement using the units shown.
  2. Review the formula and assumptions, then calculate.
  3. Read the result with its output unit; change inputs to compare scenarios.

Try this example

{"w": 10.0, "h": 2.5, "r": 0.5, "l": 10.0}

Accuracy and scope

No pattern repeat; supplied height includes trim. Openings are not deducted. Uses finite JavaScript floating-point arithmetic. Keep compatible units; rounded display values are not exact symbolic results. Estimates are not engineering certification or financial advice.

Is my data uploaded?

This tool runs locally in your browser. Input and output are not sent to a processing server. Copy or download your result before leaving the page.