What is the simple mode example?

Outflow 100,000, inflow 150,000, years 5 gives about 8.45 percent.

When does list mode run?

When you provide at least two cashflow numbers, the tool uses Newton iteration instead of the simple formula.

How should cashflows be ordered?

Use time order with the initial investment as a negative value and later returns as positives when using the list.

Can IRR fail to converge?

Unusual sign patterns can prevent a stable root. Try simplifying the series or use the two amount mode.

Is IRR the same as ROI?

No. ROI is often a total return ratio. IRR is an annualized rate that sets NPV to zero.

Does this handle monthly cashflows?

List mode treats each entry as one period. Keep periods consistent (all annual or all monthly).

Should I compare IRR to a hurdle rate?

Yes. Many teams compare project IRR to cost of capital or a required return.

Where do I screen simple profit percent?

Use the ROI calculator when you want a straightforward return on investment percent without timing IRR.

IRR Calculator: Simple CAGR or Cashflow IRR

This IRR calculator estimates internal rate of return for a project or investment. Use simple mode with one outflow, one future inflow, and years, or paste a cashflow list for Newton based IRR. The result is an annualized percent rate.

Founders and analysts use IRR to compare projects with different timing. For a quick non timed return screen, the ROI calculator may be enough.

Simple mode formula

Simple IRR equals (inflow divided by outflow) raised to (1 / years), then minus 1, shown as a percent. It assumes a single investment and a single ending value with no intermediate cashflows.

Worked example (simple mode)

Outflow $100,000, inflow $150,000, years 5. IRR ≈ (150000/100000)^(1/5) – 1 ≈ 8.45 percent.

Input	Value
Outflow	$100,000
Inflow	$150,000
Years	5
Simple IRR	~8.45%

Cashflow list mode

When the list has at least two numbers, the tool runs Newton-Raphson to find a rate where net present value is about zero. Put the initial investment first as a negative number, then period cashflows in order.

Keep periods evenly spaced in meaning (all years or all months).
Mixed signs beyond a simple invest then earn pattern can yield odd roots.
If iteration fails, simplify the series or fall back to simple mode.

How to use IRR in decisions

Compare IRR to your hurdle rate or financing cost. A project above the hurdle may still fail if cash timing, risk, or liquidity needs are wrong. IRR also ignores project scale: a tiny deal can show a high IRR with little total profit.

IRR versus ROI and NPV

ROI often divides profit by investment without fully expressing timing. NPV discounts cashflows at a chosen rate and reports currency value. IRR solves for the rate that makes NPV zero. Use more than one lens on large decisions.

Common mistakes

Mixing monthly and annual periods in one list
Omitting the initial negative investment
Comparing IRRs for projects with very different durations without care
Treating a high IRR as low risk

Choosing simple mode versus cashflow mode

Simple mode fits one investment today and one value or sale proceeds later. Real estate flips with a clear buy and sell, or a bond like hold to a known maturity style payoff, can use it. Messy projects with yearly operating cash need the list.

Build the list in consistent periods. If you use annual periods, do not drop a midyear cash item into a monthly slot without converting. Label your periods offline so you remember what each number meant.

Multiple roots and odd series

When cashflows change sign more than once, more than one IRR can exist mathematically. Newton methods may land on a root that is not the story you intended. If results look wild, plot NPV at a few discount rates or simplify the series.

Projects that require later capital calls need those negatives in the list. Leaving them out inflates IRR and hides funding risk.

Decision habits that keep IRR useful

Write the hurdle rate before you compute IRR so you do not move the goalposts.
Report IRR next to total profit in currency, not alone.
Check a pessimistic cashflow case, not only the pitch deck case.
Use ROI for quick screens when timing is secondary.

IRR is powerful when timing differs across options. It is misleading when scale differs a lot or when the cashflow signs are unstable. Keep the IRR calculator as one input beside NPV thinking, liquidity needs, and operational risk rather than as a single green light.

After you compute a simple 8.45 percent style result, ask whether intermediate costs were truly zero. If they were not, rebuild with a list before you approve spending.

Taxes and financing outside raw IRR

After tax cashflows can change ranking versus pre tax IRR. Debt financed projects may show equity IRR that differs from project IRR on total capital. This calculator works on the cashflow series you provide. It will not invent tax shields or loan draws unless you put them in the numbers.

When presenting to partners, show the cashflow table beside the IRR percent so reviewers can challenge assumptions instead of arguing about a lone headline rate.

Practical review steps

Before you rely on the result, recheck each input against a source document such as a statement, quote, or measurement note. Run one optimistic case and one cautious case so you see how sensitive the answer is. Save the inputs beside the output so you can explain the estimate later without guessing what you typed.

If a related Multicalify tool answers a neighboring question better, open that tool rather than forcing this page to do the wrong job. Clear tool boundaries keep results easier to trust and easier to explain to someone else who was not present when you calculated.

Limitations

Taxes, inflation, and financing structure are outside the raw cashflow math. Reinvestment assumptions in IRR theory may not match how you deploy returned cash.

IRR Calculator