Only calculate CAGR when the annualized growth rate matters to the decision.

If the exhibit already makes the direction and magnitude obvious, a precise CAGR may add little value and consume time.

You can describe the overall increase and, if needed, estimate the annual growth rate rather than calculating it exactly.

The calculation should answer a business question; do not perform a familiar formula simply because the data makes it possible. For more detail, see the case interview mental math guide.