Tool · marketing measurement

Brand Equity Index: computing an index without manufacturing a truth.

Direct answer

There is no universal Brand Equity Index. A useful index makes its dimensions, its weights, its missing data and its sensitivity visible. It lets you track a measurement convention — not prove causality, nor place a financial value on a brand.

The decision problem

One name covers several objects.

Market share, relative price, loyalty, awareness, preference and financial value do not answer the same question. Combining them without an explicit convention produces a precise figure that is hard to interpret. The first decision is therefore to choose what the index should describe.

Compare before computing

Four families, four uses.

Steerable composite index

Do the dimensions tracked move together?

Weighted average of normalised scores, with weights and coverage visible.

The result depends on the dimensions and the weights chosen. It is not a universal standard.

Moran index

Does the brand combine presence, price premium and loyalty?

Product of effective market share, relative price and durability.

It favours market outcomes and does not, on its own, describe the mental representations of the brand.

Consumer-based approaches

What do audiences know, perceive and prefer?

Multidimensional scales: awareness, associations, perceived quality, preference or loyalty.

Aaker and Keller structure dimensions; they do not prescribe a universal aggregated formula.

Financial valuation

What monetary value can be attributed to the brand?

Financial methods based on cash flows, comparable markets or royalties.

An operational index out of 100 never becomes a financial value through mechanical conversion.

Method	Object observed	Construction	Not to be concluded
Moran	Market outcomes	Effective share × relative price × loyalty	Financial value or causality
Aaker	Brand assets	Dashboard of dimensions tracked separately	A universal weighted score
Keller	Brand knowledge	Awareness and associations held in memory	A single ready-to-compute formula
Yoo & Donthu	Consumer-based equity	An empirically tested multidimensional scale	Automatic transferability to any market

Calculation method

Calculating the Moran index in three measures.

FormulaIndex = effective share (%) × relative price × durability (%) ÷ 100

The calculator’s composite index follows another convention — Σ(score × weight) ÷ Σ(available weights), on survey-based dimensions. The two results cannot be compared.

01Effective market share

The brand’s market share in each segment where it competes, weighted by that segment’s share of the brand’s own sales. A brand with a 30% share in a segment that makes up 60% of its sales, and 5% in one that makes up 40%, has an effective share of 30 × 0.6 + 5 × 0.4 = 20%.

02Relative price

The brand’s average price divided by the average price of comparable products in the market. A relative price of 1.12 means the brand sells 12% above the average.

03Durability

The share of the brand’s customers who will keep buying it the following year, measured by the observed retention of a cohort.

Editable calculator · fictional case

Build an explainable index.

Dimensions and weightsAn empty score is excluded; a zero weight disables the dimension.

Index formulaΣ(score × weight) / Σ(available weights)

Awareness

Consideration

Preference

Pricing power

Loyalty / retention

Comparison contextPeriodSourcePopulation

Descriptive composite index56.6 / 100

Every configured dimension takes part in the calculation.

Weighted coverage100.0 %

Comparability documented

Compare only identical periods, sources, populations, definitions and weights.

Contribution to the score

Awareness10.8 pts

Consideration11.6 pts

Preference12.8 pts

Pricing power8.8 pts

Loyalty / retention12.6 pts

Sensitivity

What does a 5-point gain change?

Mechanical change in the index, with every other dimension held identical.

Awareness+0.8 pt

Consideration+1.0 pt

Preference+1.3 pt

Pricing power+1.0 pt

Loyalty / retention+1.0 pt

Moran benchmark

Another index, another question.

Effective market share × relative price × loyalty. The result is not comparable with the composite index above.

Effective market share (%)Relative priceLoyalty / retention (%)

Moran index : 12.9

Worked example

Read the breakdown, not just the total.

In the calculator’s preloaded case, brand A holds an effective share of 18%, sells 12% above the average price and keeps 64% of its customers: 18 × 1.12 × 64 ÷ 100 = 12.9. Brand B holds 25% but sells 10% below the average and keeps only 55%: 25 × 0.90 × 55 ÷ 100 = 12.4. The larger market share does not make the stronger index.

Brand	Effective share	Relative price	Durability	Moran index
Brand A	18%	1.12	64%	12.9
Brand B	25%	0.90	55%	12.4

On the consumer side, the composite index of the same case is 56.6 out of 100: preference (12.75 points) and loyalty (12.6) contribute more than awareness (10.8), even though awareness has the highest score.

In the fictional case preloaded here, preference and pricing power weigh more than awareness. The composite index therefore does not mean “strong brand” or “weak brand”: it summarises the convention on display. The sensitivity shows which dimension mechanically moves the total when its score gains five points.

Decision ruleOnly compare what has been measured the same way.

If the population, the source, the period, the definition of a dimension or the weights change, create a new version of the method. Do not present a break in the series as a change in the brand.

What the score does not prove