Simple definition
CAGR is the smoothed, steady yearly growth rate that would take an investment from its starting value to its ending value over a set period. Real returns bounce up and down year to year; CAGR irons out the bumps into one clean number. It's like averaging a road trip's speed: the number hides the traffic jams and open highway, but sums up the whole journey.
Why it matters
CAGR lets you compare investments over different time spans on equal footing, since it expresses growth as one annual rate. It's a fairer yardstick than a raw total return, which can make a long, slow gain look better than a fast one.
Real-life example
You invest $10,000 and it grows to $16,000 over 5 years. The CAGR is (16,000 ÷ 10,000)^(1/5) − 1, which works out to about 9.9% per year — even though the actual yearly returns bounced around and were never exactly 9.9%.
Formula
CAGR = (ending value ÷ beginning value)^(1 ÷ number of years) − 1
Common mistakes
- Mistaking CAGR for the actual return in any single year, when real years vary widely.
- Assuming a past CAGR predicts the same growth rate going forward.
- Comparing CAGRs measured over very different time periods and treating them as equal.
- Ignoring fees, taxes, and inflation, which all lower the growth you actually keep.
Pro tips
- Use CAGR to compare investments held for different lengths of time.
- Pair CAGR with a measure of volatility to see how smooth or rough the ride was.
- Check whether a quoted CAGR is before or after fees.
- Remember CAGR describes the past and offers no promise about the future.
Related Money Dictionary terms
- Annualized ReturnAn investment's average yearly return expressed as a single rate, making different time periods comparable.
- Total ReturnThe full gain on an investment, combining price changes with any dividends or interest it paid.
- CompoundingWhen your investment earnings themselves start earning returns, causing your money to grow faster over time.
- Compound InterestInterest that earns interest — the engine behind long-term growth.
- Growth StockShares of a company expected to grow faster than average, usually reinvesting profits instead of paying dividends.
- BenchmarkA standard index used to compare how well your investments or a fund are performing.
Frequently asked questions
How is CAGR different from an average return?
A simple average adds up yearly returns and divides, which overstates growth because it ignores compounding. CAGR accounts for the way each year builds on the last, giving the true steady rate that connects the starting and ending values. For volatile investments, CAGR is usually lower than the simple average.
Does CAGR account for money I add along the way?
No. Plain CAGR only compares a single starting value to a single ending value, so it assumes no deposits or withdrawals in between. If you added or removed money during the period, CAGR will misstate your real experience, and you'd need a measure like money-weighted return instead.
Is a higher CAGR always better?
Not on its own. A high CAGR can come with wild swings that are hard to stomach, and past growth never guarantees future results. Compare CAGR alongside risk, fees, and how long the record covers. A steadier, slightly lower CAGR may suit you better than a jumpy, higher one.
Knowing what CAGR (Compound Annual Growth Rate) means is knowledge — the first half. A brick gets placed when you act on it: calculate the CAGR of one investment using its starting and ending values.
Sources & references
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Plain-English education — not personalized legal, tax, or investment advice.