Money Tools

Internal Rate of Return Calculator

Estimate IRR for a simple series of evenly spaced cash flows and an optional final exit value.

Updated April 12, 2026
Free online tool
Planning and research use

Why this page exists

Investment returns are easier to compare when a stream of cash flows turns into one estimated internal rate of return instead of a rough guess about whether the deal looks good. This calculator helps visitors estimate IRR for a simple evenly spaced series of cash flows, while keeping the total invested and total returned easy to review.

Interactive tool

Run the estimate

Enter your numbers and read the result first, then use the sections below to understand what affects the outcome.

Calculator

Internal rate of return calculator

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

Result

12.34%

Estimated internal rate of return for the evenly spaced cash-flow series entered, including any optional exit value added to the final period.

Estimated IRR12.34%

Total invested$10,000

Total returned$13,700

Periods analyzed4 years

InterpretationModerate estimated return

$10,000 invested up front and about $13,700 returned over 4 years produces the IRR estimate shown here.
$1,500 was added to the final cash-flow period as an exit value in this estimate.
This estimate assumes each period is evenly spaced and the cash-flow series entered is the full cash-flow picture.

This is a planning estimate, not investment advice. IRR depends heavily on the cash-flow series entered, assumes evenly spaced periods, and can be misleading when cash flows are irregular or unusually complex.

Planning note

Last updated April 12, 2026. Use this tool to compare scenarios and plan ahead, then confirm important details with the lender, employer, insurer, contractor, or other qualified provider involved in the final decision.

How it works

What the calculator is doing

Enter the initial investment and a comma-separated list of future cash inflows.

Add an optional final sale or exit value if you want it included in the final period.

The calculator estimates IRR for the evenly spaced cash-flow series and shows the total invested, total returned, and a simple interpretation note.

Understanding your result

IRR is a planning estimate, not investment advice. The result depends heavily on the cash flows entered and assumes each period is evenly spaced, so it works best as a quick screening tool rather than a full investment analysis.

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Examples

Ways people use this tool

Example scenarios help turn a quick estimate into a more useful comparison or planning step.

Screen a small project or investment quickly

A quick IRR estimate can help turn several cash-flow assumptions into one rate before doing a deeper review.

Add a final exit or sale value

Including a final value can make the estimate more useful when the investment is expected to end with a sale or payoff.

Compare two evenly spaced cash-flow patterns

Using the same period structure across two scenarios can make return differences easier to compare at a glance.

FAQ

Common questions

How does this IRR calculator work?

It estimates the discount rate that makes the evenly spaced cash-flow series entered add up to a net present value of about zero.

Why does the timing assumption matter?

Because IRR changes when cash comes in sooner or later, and this tool assumes the cash-flow periods are evenly spaced.

Can every cash-flow pattern produce an IRR?

No. Some cash-flow patterns do not produce one clean IRR result, especially when the cash flows are unusual or change direction multiple times.

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Money ToolsUpdated April 11, 2026