Explainer
Percent vs. percentage points in gaming market reports
The short answer
Percentage points measure the subtraction between two percentages. Relative percentage change divides that difference by the starting value. They describe different comparisons.
In this article
A chart shows a share moving from 20% to 25%. One caption says it increased by five points; another says it grew by 25%. Both calculations can be correct. The mistake is to use the labels interchangeably or leave readers guessing which calculation was made.
Work through the same change twice
Illustrative example
| Calculation | Result | Correct description |
|---|---|---|
| 25% − 20% | 5 percentage points | The share rose by five percentage points |
| (25 − 20) ÷ 20 × 100 | 25% | The share increased by 25% relative to its starting value |
The first calculation compares the displayed percentages directly. The second asks how large the difference is relative to the original value of 20. Writing “a five percent increase” for the first result would imply a different calculation: 20% multiplied by 1.05 is 21%, not 25%.
The denominator can change the interpretation
Imagine a segment with twenty units out of one hundred in period A and twenty-five out of one hundred in period B. Now imagine a different dataset with twenty out of one hundred followed by fifty out of two hundred. Both display the same share movement, but the underlying counts changed very differently.
Relative frequency is a count divided by the relevant total, as explained in OpenStax. Retaining those counts helps the reader distinguish an expanding numerator, a shrinking denominator, and a change in both.
Where the formula stops being useful
A percentage change from a starting value of zero requires division by zero, so the usual formula is undefined. A very small positive starting value can produce a dramatic growth percentage from a modest absolute change. In either situation, report the underlying amounts and explain the calculation boundary.
- Write “percentage points” for the difference between shares.
- State the starting value for relative growth.
- Show absolute values beside unusually large growth rates.
- Keep the reporting population and period consistent.
