What CAGR actually measures
CAGR — compound annual growth rate — answers one precise question: if your investment had grown at a single steady rate every year, what rate would take it from where it started to where it ended? Say you bought mutual fund units for ₹1,00,000 and they are worth ₹2,50,000 five years later. The CAGR is 20.11%, because ₹1,00,000 compounding at 20.11% a year lands almost exactly on ₹2,50,000 after five years.
The real journey was almost certainly bumpier — perhaps up 40% one year, down 10% the next. CAGR smooths all of that into one number, which is exactly what makes it useful: it converts any messy multi-year result into a rate you can hold up against a fixed deposit, an index fund or any other investment quoted in annual terms.
Absolute return vs CAGR — the trap of big percentages
That same ₹1,00,000 → ₹2,50,000 outcome can also be described as a 150% absolute return, and that is the number brochures and screenshots love. It sounds enormous, but it says nothing until you know how long the money was invested. 150% over five years is excellent; 150% over twenty years is roughly what a savings account might quietly manage.
The tempting shortcut — divide 150% by 5 years and call it 30% a year — is flat wrong, because it ignores compounding. Money genuinely growing at 30% a year would turn ₹1,00,000 into about ₹3,71,293 in five years, not ₹2,50,000. The honest annualised figure is 20.11%, and the gap between 30% and 20.11% is exactly why you should never trust a return that has been divided rather than compounded.
Why CAGR is the only fair way to compare investments
Different investments almost never share the same holding period, so raw absolute returns cannot be compared. CAGR puts every investment on the same per-year footing. In the table below, the investment with the biggest absolute gain — 300% — is actually the weakest performer once you annualise it.
This is why mutual fund factsheets quote 3-year and 5-year returns as CAGR rather than total growth: it lets you line up a fund launched in 2015 against one launched in 2020 without the older fund winning simply by having existed longer. A quick mental check while you compare: the rule of 72 says an investment doubles in roughly 72 ÷ CAGR years. At 20.11% that suggests about 3.6 years per doubling — the precise maths gives closer to 3.8, since the rule is an approximation that is tightest around 8% — but it is more than good enough for gut-checking a claim.
| ₹1,50,000 in 2 years (50% absolute) | 22.47% CAGR |
| ₹2,50,000 in 5 years (150% absolute) | 20.11% CAGR |
| ₹4,00,000 in 8 years (300% absolute) | 18.92% CAGR |
What CAGR hides — and when to use XIRR instead
CAGR is a point-to-point measure: it looks only at the first value and the last, and is blind to everything in between. Two funds can share an identical 5-year CAGR while one glided smoothly and the other crashed 40% along the way. The endpoints also carry outsized weight — measure a fund the month after a market fall and its 5-year CAGR sags, even if the four and a half years before were superb. Always ask what the market was doing at both ends of the window before drawing conclusions.
CAGR also assumes a single lump of money invested once and left alone. If you invested through a SIP — or added and withdrew money at various points — each rupee has its own holding period, and squeezing that into the CAGR formula gives a meaningless answer. For multiple cash flows the right tool is XIRR, which weights every instalment by exactly how long it stayed invested. That is also why your personal SIP return usually differs from the CAGR printed on the fund’s factsheet.