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How to use IRR Calculator

Enter the initial investment and each year's cash flow. The calculator iterates to find the discount rate where NPV equals zero, giving the IRR.

Frequently asked questions

What is IRR?

The Internal Rate of Return is the discount rate at which a project's Net Present Value equals zero. It represents the effective annual return of its cash flows.

How is IRR calculated?

There is no closed formula, so IRR is found numerically by testing discount rates until NPV reaches zero. This tool iterates to converge on that rate.

How do I use IRR to decide?

Compare IRR with your required rate or cost of capital. If IRR exceeds it, the project is generally worthwhile; if lower, it may not justify the investment.

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