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Carpet Area and Number of Rolls Needed Calculator

Square metres of carpet and rolls with waste allowance.

Calculates floor area (m²) = length × width, adds waste % allowance, and computes number of rolls needed from the standard roll width (typically 3.66 m or 4 m wide).

Priya Venkatesan By Priya Venkatesan
Published Last reviewed 1 min read

Inputs

m
m
m
%

Results

Enter values and click Calculate to see results.
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How to use this calculator

  1. Fill in the inputs above using the units you already have.
  2. Values update automatically as you type — no submit button needed.
  3. Hover any result row for the underlying formula and intermediate values.

Formula

area_net = L × W × (1+waste/100); rolls = ceil(area_net / (roll_width × L))

In depth

Calculates floor area (m²) = length × width, adds waste % allowance, and computes number of rolls needed from the standard roll width (typically 3.66 m or 4 m wide).