What is CAGR and why does it matter?
CAGR stands for compound annual growth rate. It is the single constant yearly rate that, when compounded over your holding period, produces your actual starting-to-ending return. Think of it as the “smoothed” annual rate — CAGR irons out the volatility of individual years into one number you can compare against any other investment.
The formula is CAGR = (End / Start)^(1 / Years) − 1. Plug in your numbers above and the calculator returns the annualized rate instantly alongside your total ROI and net gain.
CAGR is the standard metric used in fund fact sheets, earnings releases, and investor presentations precisely because it enables apples-to-apples comparison. A fund that returned 100% over 5 years (14.87% CAGR) is clearly better than one that returned 100% over 10 years (7.18% CAGR) — but you can only see that when you annualize.
CAGR vs average annual return: the critical difference
These two numbers sound similar but can diverge dramatically. The average annual return (arithmetic mean) sums each year’s return and divides — it ignores compounding. The CAGR (geometric mean) is the rate that actually compounds to your real result.
Here is why it matters: suppose an investment gains 100% in year one, then loses 50% in year two. The arithmetic average is +25%. But the CAGR is 0% — because after a 100% gain and a 50% loss, you are exactly back where you started. The average annual return overstated your performance by 25 percentage points.
Mutual funds sometimes advertise the higher arithmetic average in marketing materials. Always check the CAGR (often labeled “annualized return” in fund documents) for an accurate picture of what you would have actually earned.
When CAGR is not the right tool
CAGR works perfectly for a lump sum held for a period with no additions or withdrawals. The moment you start adding money at different times — a monthly brokerage contribution, say — the timing of those deposits affects your personal return. CAGR cannot capture that.
For ongoing contribution programs, the correct measure is the money-weighted return (IRR), which gives more weight to periods when you had more money invested. The calculator above switches to IRR automatically when you enter a monthly contribution amount. The IRR is also what GIPS-compliant investment managers report for client portfolios.
For projecting future growth at an assumed CAGR, switch to Mode B (“What will it grow to?”) or use the full-featured Compound Interest Calculator, which adds an inflation toggle, rate-variance band, and year-by-year breakdown.
The Rule of 72 and CAGR benchmarks
A quick way to use your CAGR: divide 72 by it to get the approximate number of years for your money to double. At 6% CAGR, money doubles every 12 years. At 10%, every 7.2 years. At 12%, every 6 years.
Common CAGR benchmarks to compare against:
- U.S. broad market index (S&P 500): ~10% nominal, ~7% real
- U.S. bonds (10-year Treasury): ~3–5% depending on period
- High-yield savings / money market: 3–5% in current environment
- Real estate (price appreciation only): ~4–5% historically
- Inflation (CPI): ~3% long-run average
Any investment with a CAGR below inflation is losing real value, even if the nominal balance grows. The S&P 500 return calculator shows you both the nominal and real CAGR side by side for any time horizon.
Compound growth rate: same idea, different name
You will often see “compound growth rate” in business contexts — revenue growth decks, SaaS metrics, market-size projections — while “CAGR” dominates investment reporting. They are the same number produced by the same formula. A company that grew revenue from $2 million to $6.5 million over four years has a compound growth rate (CAGR) of approximately 34.3% per year.
The key word in both terms is compound: each year’s growth builds on the prior year’s cumulative base, not on the original starting value. That is what separates compound growth from simple annual growth, which applies the same dollar increment (not the same percentage) every year and therefore understates how quickly exponential processes accelerate.
Whether you are sizing a market, benchmarking a portfolio, or modeling a savings plan, the calculator above handles all three uses. Enter any starting and ending values with a time period and it returns the compound growth rate (CAGR) instantly.
Frequently asked questions
How do you calculate CAGR?
CAGR = (Ending Value / Beginning Value)^(1 / Number of Years) − 1. For example, if an investment grew from $10,000 to $18,000 over 5 years, CAGR = (18,000 / 10,000)^(1/5) − 1 = 1.8^0.2 − 1 ≈ 12.47% per year. The calculator above does this instantly and also shows the total ROI percentage alongside.
What is a good CAGR?
The U.S. broad stock market has delivered roughly 10% CAGR in nominal terms over long periods. For a single stock, fund, or business, what counts as "good" depends on the risk taken and the alternatives available. A 15–20% CAGR from a diversified portfolio over 10+ years would be considered exceptional. For a savings account or bond ladder, 3–5% is realistic and fine given the lower risk.
What is the difference between CAGR and average annual return?
The average annual return simply sums each year's return and divides by the number of years — it ignores compounding. CAGR is the geometric mean: the single constant rate that produces the actual end result when compounded year over year. If an investment gained 50% one year then lost 33% the next, the average is +8.5% but the CAGR is 0% — because you are back where you started. CAGR is always the more accurate measure.
What does a 10% CAGR mean?
A 10% CAGR means your investment grew at the equivalent of 10% per year, compounded annually, over the full holding period. At 10% CAGR, money roughly doubles every 7.2 years (Rule of 72). A $10,000 investment at 10% CAGR over 30 years would grow to about $174,494.
When should I use CAGR vs IRR (money-weighted return)?
Use CAGR for lump-sum investments where no money was added or withdrawn during the holding period. Use IRR (money-weighted return) when you made contributions at different times — such as monthly investing into a brokerage account. IRR accounts for the size and timing of each cash flow, making it more accurate for ongoing investment programs. The calculator switches to IRR automatically when you enter monthly contributions.
Is CAGR the same as compound growth rate?
Yes — compound growth rate and CAGR are the same concept, just different names. Both describe the single constant annual rate that, when compounded over a period, transforms the starting value into the ending value. Finance professionals typically say CAGR; business and sales teams often say compound growth rate or compound annual growth rate interchangeably. The formula is identical: (End / Start)^(1 / Years) − 1.