CAGR vs XIRR: How to Measure Investment Returns Correctly

Someone tells you their investment doubled. Impressive, until you learn it took 25 years to do so. Someone else says they made a 40 percent return. Also impressive, until you learn it took 6 years. Raw return figures, on their own, can be deeply misleading. To judge an investment honestly, you need to bring time into the picture. That is what CAGR and XIRR do, and this guide explains both.

Why absolute return is not enough

The simplest way to measure a return is the absolute return, which is just the total percentage gain. If ₹1,00,000 grows to ₹1,50,000, the absolute return is 50 percent.

The problem is that absolute return ignores time completely. A 50 percent gain in 2 years is excellent. The same 50 percent gain spread over 15 years is poor, barely keeping pace with inflation. The same number describes a great investment and a weak one. Absolute return cannot tell them apart, which is why you should never compare two investments using it alone.

CAGR: the annual growth rate

CAGR stands for Compound Annual Growth Rate. It answers a precise question: at what steady annual rate would your investment have to grow to get from its start value to its end value over the given period?

CAGR smooths out all the bumps. A real investment rises and falls every year, but CAGR expresses the journey as a single, steady annual rate. This makes it the right tool for comparing investments fairly, because it puts everything on a per-year basis.

Our CAGR calculator computes this from any start value, end value and time period. There is also a handy shortcut, the Rule of 72, explained in our guide to compounding, which estimates how fast money doubles at a given CAGR.

Where CAGR falls short

CAGR has one important limitation. It works only when there is a single investment and a single end value, one amount in at the start and one amount out at the end.

But that is not how most people invest. With a SIP, you invest a fresh amount every single month. You might also add lump sums occasionally, or make a partial withdrawal. Each of these happens on a different date. The money you invested in the first month has been working for years; the money you invested last month has barely started. CAGR cannot handle this. It has no way to account for many cash flows on many different dates.

XIRR: the return for real-life investing

This is where XIRR comes in. XIRR stands for Extended Internal Rate of Return. It is the annualised return on a series of cash flows that happen on different dates. In other words, XIRR is CAGR's more capable cousin, built for the messy reality of how people actually invest.

XIRR takes every cash flow and its exact date: every SIP instalment as money going in, every additional purchase, every withdrawal, and the current value as money notionally coming out. It then finds the single annual rate that makes all of it balance. Each rupee is correctly credited for exactly how long it was invested.

Our XIRR calculator lets you enter each dated cash flow and gives you the true annualised return on your SIP or any irregular investment.

CAGR or XIRR: which to use when

A simple way to remember it: if there is only one transaction at the start, use CAGR. If there are many transactions on different dates, use XIRR. For a typical investor running SIPs, XIRR is the number that tells the truth about their portfolio.

Judging whether a return is actually good

Once you have a proper annualised figure, CAGR or XIRR, you can finally judge it. A return is good only relative to the right benchmarks:

• Against inflation. If your return after tax does not beat inflation, your wealth is not really growing. See our inflation guide.
• Against a safe alternative. If an equity fund's long-term return is barely above a fixed deposit's, you took market risk for little reward.
• Against a relevant benchmark. An equity fund should be compared against a suitable market index over the same period.
• Against your goal. Ultimately, the return that matters is whether it is enough to reach your goal in time.

The takeaway

Never trust a return figure that has no time period attached. Absolute return flatters and misleads. CAGR expresses a single investment's growth as a clean annual rate. XIRR does the same for the real, multi-date investing that SIPs involve. Together they let you see how your money is genuinely performing.

A return without a time period is a story without an ending. CAGR and XIRR are how you read the whole story.

Use the CAGR calculator for one-time investments and the XIRR calculator for your SIPs. Knowing your real annualised return is the first step to knowing whether your plan is working.