Internal Rate of Return (IRR) Calculator
Results are estimates based on the values you enter. Recheck your inputs and assumptions before using the output for decisions.
Solve for internal rate of return from an initial investment and five yearly cash inflows.
Internal Rate of Return (IRR) Calculator
Free online internal rate of return calculator to estimate the discount rate that makes the net present value of a project equal to zero. This calculator is useful for investors, business owners, project managers, finance students, analysts, startup founders, and anyone comparing investment opportunities with multiple future cash inflows. IRR is one of the most widely used capital budgeting tools because it helps summarize the earning power of a project as a yearly return percentage. Instead of only looking at total cash received, IRR also considers when those cash flows arrive.
This calculator uses an initial investment and five yearly cash flows. Initial investment means the upfront cost paid at the start of the project. Cash flow year 1 through cash flow year 5 mean the expected money received at the end of each year. Once those values are entered, the calculator solves for IRR, then also shows total cash inflows, net profit, and cash flow multiple. These extra outputs are useful because IRR is powerful, but it should still be read beside the total money generated and the overall size of the investment outcome.
The formula of internal rate of return
NPV = -Initial investment + CF1 / (1 + r)^1 + CF2 / (1 + r)^2 + CF3 / (1 + r)^3 + CF4 / (1 + r)^4 + CF5 / (1 + r)^5
For IRR, NPV = 0 and the calculator solves for r
Total cash inflows = CF1 + CF2 + CF3 + CF4 + CF5
Net profit = Total cash inflows – Initial investment
Cash flow multiple = Total cash inflows / Initial investment
Here CF1 through CF5 mean the expected yearly cash inflows from the project, r means the internal rate of return, NPV means net present value, total cash inflows means the sum of all future money received, net profit means the simple difference between money in and money out, and cash flow multiple shows how many times the initial investment is returned by the project in raw cash terms.
Solved Example
Example 1: Find the IRR if the initial investment is $10,000 and the yearly cash flows are $3,000, $3,500, $4,200, $4,500, and $4,800.
Solve: The calculator solves the rate that makes NPV equal to zero for this cash flow stream.
IRR = about 25.9183%
Total cash inflows = 3000 + 3500 + 4200 + 4500 + 4800 = $20,000
Net profit = 20000 – 10000 = $10,000
Cash flow multiple = 20000 / 10000 = 2.0000
Example 2: Find the IRR if the initial investment is $25,000 and the yearly cash flows are $7,000, $8,000, $9,000, $10,000, and $11,000.
Solve: IRR = about 21.3998%
Total cash inflows = $45,000
Net profit = 45000 – 25000 = $20,000
Cash flow multiple = 45000 / 25000 = 1.8000
Example 3: Find the IRR if the initial investment is $50,000 and the yearly cash flows are $12,000, $14,000, $16,000, $18,000, and $20,000.
Solve: IRR = about 16.3625%
Total cash inflows = $80,000
Net profit = 80000 – 50000 = $30,000
Cash flow multiple = 80000 / 50000 = 1.6000
Table of internal rate of return calculator
| Initial Investment | Total Cash Inflows | IRR | Net Profit | Cash Flow Multiple |
|---|---|---|---|---|
| $10,000 | $20,000 | 25.9183% | $10,000 | 2.0000 |
| $15,000 | $25,000 | 18.3399% | $10,000 | 1.6667 |
| $25,000 | $45,000 | 21.3998% | $20,000 | 1.8000 |
| $50,000 | $80,000 | 16.3625% | $30,000 | 1.6000 |
How to use this internal rate of return calculator
Enter the initial investment in the proper input field. After that, enter the cash inflows for year 1 through year 5. Then click the calculate button. The calculator will solve for IRR and also show total cash inflows, net profit, and cash flow multiple in the result box.
This calculator is useful when comparing projects that have different timing patterns of returns. Two projects may both return the same total cash, but the one that returns money earlier will usually produce a higher IRR. That makes IRR especially helpful when evaluating business projects, equipment purchases, startup initiatives, property investments, and capital budgeting decisions where timing matters. It gives a rate-based way to compare opportunities of different sizes and different cash flow timing.
When using the result, remember that IRR should not be used alone. Some cash flow patterns can produce unusual or misleading IRR results, especially if cash flows change direction more than once. IRR also does not directly show total value created in dollars, which is why it is often reviewed together with NPV, payback period, and profitability index. Even so, IRR remains one of the clearest quick-return measures for multi-year projects. This calculator gives a practical estimate that supports investment comparison, project screening, budgeting, and finance learning.