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Investing & Savings

IRR Calculator

Estimate the internal rate of return for a series of evenly spaced cash flows.

Best for: Estimate the internal rate of return for a sequence of evenly spaced investment cash flows.

Your assumptions

Calculate your estimate

Enter cash flows separated by commas, beginning with the initial investment.

Your result

IRR estimate

Estimated IRR
10.48%
Net cash flow
$3,000.00
Cash-flow periods
5

How to use this irr calculator

Use this IRR calculator to find the discount rate that makes the net present value of evenly spaced cash flows approximately zero. IRR is useful for comparing return patterns, but it should be read alongside project scale, timing, risk, and a realistic required return.

  1. 1

    Enter cash flows in order

    Start with the initial outflow as a negative number, followed by each evenly spaced inflow or outflow.

  2. 2

    Review the estimated IRR

    Compare the annualized result with the return required for the project’s risk and financing cost.

  3. 3

    Stress-test timing and proceeds

    Reduce later inflows or delay the exit value to see how dependent the return is on optimistic assumptions.

Worked planning example

Example: test an investment with a large exit value

Set up

Enter a negative initial investment, several periodic cash inflows, and the expected sale proceeds in the final period.

Compare

Run a second case with a lower sale price or an additional holding period while preserving the other cash flows.

Takeaway

A high IRR can be driven by one uncertain terminal value, so the cash-flow assumptions matter as much as the headline rate.

Use IRR with scale and risk measures

IRR is a rate, not a dollar-value measure, and unconventional cash flows can produce multiple or misleading solutions.

  • Compare net present value at a defensible discount rate.
  • Confirm that cash-flow periods are equally spaced.
  • Evaluate concentration in the terminal or resale assumption.

Calculation methodology and assumptions

For this irr estimate, Silvia uses cash flows. Estimate the internal rate of return for a series of evenly spaced cash flows. Results are estimates, not quotes, tax advice, or investment recommendations.

Frequently asked questions

What does IRR mean?

IRR is the discount rate at which the net present value of the entered cash flows is approximately zero. It expresses a return implied by the timing and amount of those cash flows.

Why can an IRR result be misleading?

IRR does not show project size, assumes a particular cash-flow pattern, and can have multiple solutions when cash flows change sign more than once. Pair it with net present value and scenario analysis.

Can I use monthly cash flows?

You can enter evenly spaced monthly cash flows, but the result’s period must be interpreted correctly. This calculator is designed as an annualized planning estimate, so convert or verify periodic results before comparing them.

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