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IRR is useful for uneven cash flows, but it can be misleading when projects have unusual timing or reinvestment assumptions.

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Calculator Guide

How the IRR Calculator works

The internal rate of return (IRR) is the annual rate that makes a series of cash flows — money in and money out over time — break even. It's the standard way to judge projects or investments with uneven cash flows across multiple periods.

Formula

IRR is the rate r where Σ [Cashflowₜ ÷ (1 + r)ᵗ] = 0

Cashflowₜ is the net cash flow in period t (negative for outflows like the initial investment, positive for returns). IRR is found by trial and error or numerically, since it can't be isolated algebraically.

Worked example: invest $10,000, receive $3,000/year for 4 years

  1. Cash flows: −10,000 today, then +3,000, +3,000, +3,000, +3,000.
  2. Total received = $12,000, so there's a $2,000 nominal gain.
  3. Solving Σ Cashflowₜ ÷ (1 + r)ᵗ = 0 numerically gives an IRR of roughly 7.7%.
  4. That 7.7% is the annual return that equates the future cash flows to the initial $10,000.

How to read the result

IRR lets you compare projects with different timing and amounts of cash flow against a single yardstick. A project is generally attractive if its IRR exceeds your required return (your 'hurdle rate' or cost of capital).

Common mistakes to avoid

  • Using IRR alone for projects with unusual cash-flow patterns, which can produce multiple IRRs.
  • Comparing IRR without considering project size — a high IRR on a tiny project may add little value.
  • Assuming interim cash flows are reinvested at the IRR, which is often optimistic.

Tips

Continue learning:All CalculatorsMoney GuidesCalculator MethodologyFinancial Disclaimer
Editorial note: Prepared by MoneyCalcKit editors and last reviewed June 1, 2026. Calculators use transparent formulas and browser-side inputs for educational planning estimates.

Frequently Asked Questions — IRR Calculator

It's the annual return that makes a project's cash inflows and outflows break even. If it exceeds your required return, the project is generally worth pursuing.
They complement each other. IRR gives a rate that's easy to compare; NPV gives the dollar value added. For ranking projects of different sizes, NPV is often more reliable.
Projects with alternating positive and negative cash flows can have more than one IRR, and IRR assumes reinvestment at its own rate, which may be unrealistic.
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