CAGR Calculator

CAGR Smooths Out the Bumpy Years

CAGR answers "what constant annual growth rate would take my start value to my end value over this period?" — it's not the average of each year's actual return, and it doesn't show you the volatility along the way. An investment that went up 40% one year and down 20% the next could show a modest, steady-looking CAGR that masks a genuinely bumpy ride. Use CAGR to compare the end-to-end performance of different investments over the same period, not as a measure of how smooth the journey was.

The formula this calculator uses is CAGR = (End Value / Start Value)^(1/Years) − 1, expressed as a percentage. It only needs three inputs — the starting value, the ending value, and the number of years between them — and deliberately ignores everything that happened in between. That's both its strength (a clean, comparable single number) and its limitation (it can't tell you whether the ride was smooth or turbulent).

Worked Example

An investment growing from ₹1,00,000 to ₹2,00,000 over 5 years:

Notice the CAGR (14.87%) is meaningfully lower than simply dividing the 100% total growth by 5 years (which would suggest 20%/year) — that's because CAGR accounts for compounding, so a smaller annual rate compounded over 5 years still reaches the same doubling. This gap between the "naive" average and the actual CAGR widens further as the holding period lengthens.

CAGR vs Absolute Return vs XIRR

These three measures answer different questions, and mixing them up leads to comparing numbers that aren't actually comparable:

A common mistake is using CAGR to describe a SIP's performance — CAGR assumes one single starting amount, but a SIP has a dozen or more separate installments each with their own date, which is precisely what XIRR is built to handle correctly.

Comparing Investments Fairly

CAGR is most useful for comparing two investments held over the same time period — a mutual fund's 5-year CAGR versus a fixed deposit's contracted rate over the same 5 years, for instance. Comparing CAGRs across different time periods (a fund's 3-year CAGR versus another's 7-year CAGR) can be misleading, since shorter periods are more sensitive to the specific start and end dates chosen.

Be especially cautious with short periods that happen to start right after a sharp market fall or end right at a market peak — the CAGR calculated over such a window can look unusually high or low purely because of where the start and end dates landed, not because of the investment's typical behavior.

How Sensitive CAGR Is to the Start and End Dates

Because CAGR uses exactly two data points, the specific dates you pick can matter as much as the investment's actual underlying behavior. A fund measured from just after a market crash to today will show an inflated CAGR, since the "start value" was unusually depressed — this is sometimes called a low base effect. Conversely, a fund measured from just before a crash to today can understate its typical performance. When you're evaluating a fund's advertised CAGR, it's worth checking what specific start and end dates were used, and whether a slightly different window would tell a meaningfully different story. Comparing the same fund's CAGR over several different windows — say 3-year, 5-year, and 10-year — gives a fuller picture than relying on whichever single window happens to be highlighted in a fund's marketing material, since funds understandably tend to lead with whichever window shows the most favorable figure.

Using CAGR to Set a Target

Beyond measuring past performance, this same formula works forward: if you know your starting amount and want to reach a target value by a certain year, you can use the calculator to find the CAGR you'd need to assume, and use that as an input into a lumpsum or SIP goal-planning calculation. This is useful for financial goal-setting — for example, checking whether reaching a target corpus for a child's education by a specific year requires an assumed return that's realistic for your chosen asset mix, or aggressive enough that you'd need to reconsider the amount, timeline, or investment approach.

CAGR Doesn't Account for Additional Investments

This calculator is built for a single starting amount growing to a single ending amount — it isn't designed for a portfolio where you added money partway through. If you invested ₹1,00,000 initially and then added another ₹50,000 in year 3, a naive CAGR calculation using only the very first and very last values would misrepresent your actual return, since it would treat the whole final value as if it grew entirely from the original ₹1,00,000. For portfolios with multiple cash flows at different times, XIRR is the more accurate tool.

CAGR vs Inflation-Adjusted (Real) Return

The CAGR this calculator produces is a nominal figure — it doesn't strip out inflation. A 14.87% CAGR sounds strong on its own, but what it actually bought you in terms of purchasing power depends on how much prices rose over the same period. Investors sometimes compare a nominal CAGR directly against inflation-adjusted figures from other sources without realizing they're mixing two different bases.

A rough way to estimate the real (inflation-adjusted) rate is to subtract the average annual inflation rate from the nominal CAGR — this approximation works reasonably well at moderate rates, though the more precise formula involves dividing rather than subtracting. Either way, always be clear about whether a return figure you're looking at — your own or one quoted elsewhere — is nominal or inflation- adjusted before comparing it to another number.

Common Mistakes When Reading a CAGR Figure

A few misreadings come up often enough to flag directly. First, treating CAGR as what you'd have actually experienced year to year — it's a smoothed constant rate, not a description of the real path. Second, assuming a fund's historical CAGR will repeat going forward — past CAGR describes what happened over one specific window, not a projection, and market-linked returns are never assured to repeat at the same rate. Third, comparing CAGRs measured over different lengths of time as if they were equivalent, when a 2-year CAGR and a 10-year CAGR can respond very differently to short-term market swings.

A more subtle mistake is anchoring too heavily on the exact start and end dates. Since CAGR only looks at two points, shifting the start date by even a few months — say, from just before a sharp fall to just after it — can noticeably change the resulting figure without the investment's actual long-run behavior having changed at all.

CAGR Outside Investing: Revenue and Business Growth

CAGR is also widely used outside personal investing — a business tracking revenue, user count, or profit growth over several years often expresses it as a CAGR rather than a plain multi-year growth percentage, for the same reason investors do: it converts an uneven multi-year climb into one comparable annual figure. A company whose revenue grew from ₹10 crore to ₹25 crore over 6 years has a CAGR of roughly 16.5%, which is a more useful figure to compare against a competitor's growth rate than the raw 150% total increase, since it accounts for the different number of years each company may have been measured over.