CAGR in plain English
CAGR answers a simple question: what steady annual rate would produce the same start-to-end result? If an investment grew from $10,000 to $20,000 over ten years, CAGR translates that total growth into an annualized rate.
The important word is smoothed. Real investments rarely earn the same return every year. CAGR makes comparison easier, but it hides the path taken to reach the ending value.
When to use the CAGR Calculator
Use the CAGR Calculator when you know the starting value, ending value, and number of years. It is especially useful for comparing completed investment periods, business metrics, revenue growth, portfolio growth without added deposits, or price changes over time.
If there were deposits or withdrawals during the period, basic CAGR may not represent your actual investor return. In that case, you may need a cash-flow-aware return measure.
How CAGR relates to compound interest
CAGR solves for the rate implied by historical start and end values. A compound interest projection uses an assumed rate to estimate a future value. The math is related, but the direction is different.
A past CAGR can inform planning assumptions, but it should not be treated as a guaranteed future return. Compare it with conservative and optimistic assumptions before projecting future growth.