CAGR vs XIRR: Which Return Number Should You Trust?

Two ways to measure the same thing — sort of When you check how an investment performed, you will run into two numbers: CAGR and XIRR. They both express returns as an annual percentage, and for simple cases they agree. But they answer subtly different questions, and using the wrong one can badly misrepresent how your money actually did — especially if you invest through SIPs.

What CAGR measures CAGR, the Compound Annual Growth Rate, is the smooth annual rate that takes a single investment from its starting value to its ending value. It assumes one lump sum invested at the start and left untouched until the end. If you put ₹1,00,000 into a fund and it became ₹2,00,000 in six years, CAGR cleanly tells you the annualised growth rate. It is perfect for one-shot investments with no cash flows in between.

Where CAGR falls short The moment you invest at multiple points in time — as you do with a SIP — CAGR stops working properly. Each monthly instalment was invested for a different length of time. Your first SIP has been growing for years; your most recent one for a month. CAGR cannot account for this because it assumes a single entry and exit. Applying it to a SIP gives a misleading picture of your true return.

What XIRR measures XIRR, the Extended Internal Rate of Return, is built exactly for this problem. It handles multiple cash flows on different dates — every SIP instalment, any lump-sum top-ups, even partial withdrawals — and computes the single annualised rate that reconciles all of them with your final value. Because it weights each cash flow by how long it was actually invested, XIRR gives an accurate return for the messy, real-world way most people invest.

When to use which - Use CAGR for a single lump-sum investment with one entry and one exit — a one-time fund purchase, an FD, or comparing two point-to-point returns. - Use XIRR for SIPs, staggered investments, or any account where money went in (or came out) at multiple dates.

Put simply: one cash flow, use CAGR; many cash flows, use XIRR. Reaching for CAGR on a SIP is one of the most common mistakes retail investors make.

A quick intuition Imagine you invested ₹10,000 every month for three years. Your total invested is ₹3,60,000, but most of that money went in recently and has had little time to grow. If you naively compute CAGR on the total invested versus the final value, you understate your return, because you are treating recently added money as though it had been invested for the full three years. XIRR corrects for this by respecting each instalment's actual holding period.

Why this matters for judging funds When a fund advertises returns, check whether the figure is a point-to-point CAGR or an XIRR on regular investments — they can differ meaningfully. Comparing your personal SIP performance against a fund's lump-sum CAGR is not apples to apples. Knowing which number you are looking at prevents both false disappointment and false confidence about how your investments are really doing.

Calculate your own returns For a single investment, the CAGR calculator gives you a clean annualised figure to compare options on equal footing — enter your start value, end value and duration, and you have your growth rate instantly. For SIPs, remember to reach for an XIRR-based measure instead so each instalment is counted correctly. Using the right tool for the right cash-flow pattern is what makes your return numbers trustworthy.

The bottom line CAGR and XIRR are not rivals; they are specialists. CAGR is the clean choice for a single lump sum, while XIRR is the honest measure for SIPs and any investment with cash flows at different times. Match the metric to how you actually invested, and the return number you see will finally reflect the truth.