About The IRR Calculator

The IRR Calculator estimates the discount rate that makes a cash-flow series break even at a net present value near zero. It is useful for comparing project return scenarios, not for making final investment decisions by itself.

How to Use the IRR Calculator Online

1. Enter the initial investment as a positive upfront amount.
2. Add expected future cash flows separated by commas or new lines.
3. Run the calculator and review the estimated annualized IRR.

Choosing Options Correctly

Keep cash-flow periods consistent. IRR can be misleading when cash flows change signs more than once or when reinvestment assumptions matter, so compare it with NPV and payback checks.

Common Use Cases

• Compare project or investment return scenarios.
• Estimate return from uneven cash-flow projections.
• Run a quick reasonableness check before deeper analysis.

Quick FAQ

Is this financial advice?
No. IRR is one metric for cash-flow comparison and should not be used alone for investment decisions.

Why can IRR fail?
Some cash-flow patterns have no real IRR or multiple possible IRRs, especially when signs change more than once.

What if the IRR is negative?
A negative IRR means the cash-flow pattern loses value relative to the starting investment under the entered assumptions.

Should I compare IRR with NPV?
Yes. NPV usually gives a clearer dollar-value view, while IRR can be misleading for different project sizes or irregular cash flows.