Skip to content
ENExplore Calculators

Shelf Space Allocation Calculator

Work out shelf space allocation instantly with clear inputs, formula shown and shareable results.

About Shelf Space Allocation Calculator

Space allocation on sales share alone rewards volume regardless of profitability, while margin share alone starves the traffic-driving lines. Blending the two is standard practice, and showing both extremes reveals how much the weighting choice actually moves the allocation.

Formulas

Blended share

Blended = Sales share x Weight + Gross profit share x (1 - Weight)

Allocation

Space = Total category space x Blended share

Worked example

With the default values below, Shelf Space Allocation Calculator returns Shelf space allocation of 1.920. Change any input above and every figure here is recalculated in your browser.

Inputs used

This line's share of category sales
14
This line's share of category gross profit
18
Total category shelf space
12 m
Weight given to sales share
50

Results

Shelf space allocation
1.920
Blended share of the category
16.00%
Allocation on sales share alone
1.680
Allocation on margin share alone
2.160

Step by step

  1. 1Values used
  2. 2Blended share
  3. 3Allocation
  4. 4Shelf space allocation= 1.920
  5. 5Blended share of the category= 16.00
  6. 6Allocation on sales share alone= 1.680
  7. 7Allocation on margin share alone= 2.160

Assumptions and limits

  • The result is derived only from the 4 inputs listed above. Anything not among them is not part of the calculation.
  • In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
  • Figures are rounded for display to 3 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Frequently Asked Questions

Should destination lines get extra space?

Yes, beyond what the formula gives. Lines that bring customers into the store carry value not captured in their own sales or margin.

What about gross margin return on space?

That is the more sophisticated measure — gross profit per linear metre — and it is the right basis once you have reliable space data.

Related Calculators

Shelf Space Allocation Calculator | Calcrivo