What XIRR Measures
XIRR (Extended Internal Rate of Return) calculates the annualised return of an investment with cash flows occurring on irregular dates — unlike simple CAGR, which assumes a single lump-sum investment and a single withdrawal. This makes XIRR the correct metric for SIPs, staggered lump-sum investments, or any portfolio with multiple deposits and withdrawals over time.
How XIRR Is Calculated
XIRR finds the discount rate that makes the Net Present Value (NPV) of all your cash flows — each discounted back to today based on its specific date — equal to zero. Because this requires solving a nonlinear equation, this calculator uses an iterative numerical method (bisection) to converge on the correct rate, the same underlying approach spreadsheet software uses internally.
Why XIRR Matters More Than Absolute Returns
Two investors who put in the same total amount but at different times can have very different actual returns — an investor who invested most of their money right before a market rally will show a much higher XIRR than one who invested steadily throughout, even with identical total contributions and final value. XIRR captures this timing effect that a simple percentage return calculation misses entirely.
Common Uses
- Evaluating actual SIP (Systematic Investment Plan) mutual fund returns
- Comparing real estate or business investment returns with irregular income and expense timing
- Assessing true portfolio performance when you've made multiple deposits and partial withdrawals over time