You've held a fund for three years and it shows +30%. Do you know what that means as a yearly compounding rate? Most people use a simple average and miss the compounding effect. Let's understand the metric investors should care about most: CAGR (Compound Annual Growth Rate).
What Is CAGR?
CAGR measures the average annualized return of an investment over a period, assuming profits compound. It's the most honest way to describe long-term investment performance.
CAGR = (Ending Value ÷ Beginning Value) ^ (1 ÷ Years) − 1
A Worked Example
You invested $100,000 three years ago; the account is now $159,700. CAGR = (159700 ÷ 100000)^(1÷3) − 1 ≈ 16.9%.
That means your money grew at a 16.9% compounding rate each year. Cube roots are easy to get wrong by hand — use the CAGR calculator, enter beginning value, ending value, and years, and get the answer instantly.
CAGR vs Simple Average
| Metric | Method | Problem |
|---|---|---|
| Simple average | Sum of yearly returns ÷ years | Ignores compounding, can inflate |
| CAGR | Geometric mean (compounding) | Honest long-term annualized return |
Example: +100% in year 1, −50% in year 2. Simple average says +25%, but you're actually back to zero — CAGR is 0%. That's why CAGR is more trustworthy.
How to Use CAGR
- Compare funds: for cross-product long-term annualized returns, CAGR beats short-term gains
- Set goals: work backward to find how many years and what return you need to hit a target
- Evaluate compounding plans: pair with the compound interest calculator to see how future values differ across rates
Related Metric: APY
APY (Annual Percentage Yield) accounts for compounding frequency and is common for savings and deposit products. Daily vs annual compounding gives different APY figures — use the APY feature on the CAGR/APY calculator for precise comparisons.
Keep Returns in Perspective
A 16.9% annualized return looks great, but be wary of high-return promises. Sustainable long-term returns typically sit in the 6%–10% range. Any "guaranteed high yield" deserves heavy skepticism. Use the retirement calculator to break your financial goals into steps — more practical than chasing short-term swings.
Use the CAGR calculator to find the true annualized return of every investment you make — decide rationally and let compounding work for you.