CAGR Calculator

Simple average returns are mathematically misleading for investments because they ignore compounding effects. Consider an investment that gains 100% one year and loses 50% the next. The simple average return is 25% — which sounds excellent. But in reality, the investment is back exactly where it started: $10,000 grows to $20,000 then falls to $10,000. The actual return is 0%. CAGR captures this reality. Since the ending value equals the beginning value, CAGR is correctly calculated as 0%, not 25%.

This gap between arithmetic mean (simple average) and geometric mean (CAGR) grows with volatility. A highly volatile investment with a high arithmetic return may have a much lower CAGR than a less volatile investment with a lower arithmetic return. This is why financial professionals use CAGR — or its cousin, the time-weighted return — rather than simple averages when evaluating investment performance. Whenever someone shows you an average return figure without specifying whether it is arithmetic or geometric, you should ask which one is being reported. For most investment decisions, only the geometric figure matters.

CAGR works perfectly for lump-sum investments where you put money in at a single point in time, leave it untouched, and evaluate it at a single endpoint. If you invested $10,000 in a mutual fund in 2015 and it is worth $25,000 in 2023, CAGR gives you the exact equivalent annual growth rate with no ambiguity.

IRR (Internal Rate of Return) is more appropriate when there are multiple cash flows over the investment period — additional contributions, partial withdrawals, or periodic income. If you invested $10,000 in 2015, added $2,000 in 2018, and the portfolio is worth $30,000 in 2023, CAGR would give a misleading answer because it ignores the timing and size of the intermediate contribution. IRR correctly accounts for when each dollar was invested and returned. Real estate investors almost always use IRR rather than CAGR when evaluating rental properties because rental income, capital expenditure, refinancing proceeds, and the eventual sale all happen at different times and amounts. For personal investing with regular contributions (such as monthly 401(k) deposits), the dollar-weighted return (DWRR) or personal IRR is the most meaningful performance metric.

CAGR is a smoothing function — it replaces the actual jagged path of returns with a clean straight line. This is useful for comparison but can create a dangerously false sense of precision. Two investments can have identical CAGRs with radically different risk profiles. A portfolio that earned exactly 10% every year for 10 years has the same 10% CAGR as one that lost 20% three times and gained 60% four times. Your experience holding these two portfolios would be completely different, especially if you needed to sell during a down year.

Always consider CAGR alongside risk measures: standard deviation (how wide the swings were), maximum drawdown (the worst peak-to-trough decline), and Sharpe ratio (return per unit of risk). CAGR also assumes full reinvestment of all gains at the same rate — in practice, dividends may not be reinvested, capital gains taxes reduce the compounding base, and fees erode returns annually. When comparing two investments with similar CAGRs, the one with lower fees and less volatility is generally superior on a risk-adjusted basis. CAGR is the starting point for investment evaluation, not the ending point.