IRR Calculator
Calculate Internal Rate of Return for investment cash flows.
Cash Flows
Note: First cash flow should be negative (initial investment), subsequent flows should be positive (returns).
IRR Results
About This Calculator
The IRR (Internal Rate of Return) Calculator helps you determine the annualized return rate of an investment based on a series of cash flows. IRR is the discount rate that makes the Net Present Value (NPV) of all cash flows equal to zero.
IRR is a key metric for evaluating investment opportunities. It represents the effective annual return rate, making it easier to compare investments with different cash flow patterns. Higher IRR values indicate better investment returns.
Formula & Calculation Method
IRR Calculation:
NPV = Σ [CF₀/(1+r)⁰ + CF₁/(1+r)¹ + CF₂/(1+r)² + ... + CFₙ/(1+r)ⁿ] = 0
Where: CF = Cash Flow, r = IRR, n = Period
IRR is the rate (r) where NPV equals zero
Solved using iterative methods (Newton-Raphson)
IRR is found by solving for the discount rate that makes the sum of all discounted cash flows equal to zero. The first cash flow is typically negative (initial investment), followed by positive cash flows (returns).
How to Use This Calculator
- Enter Initial Investment: Input the first cash flow as a negative number (your initial investment).
- Enter Cash Flows: Input subsequent cash flows as positive numbers (returns received).
- Add More Periods: Click "Add Period" to include additional cash flow periods.
- Remove Periods: Click the X button to remove cash flow periods.
- View Results: See the calculated IRR percentage and NPV at that rate.
Frequently Asked Questions
What is a good IRR?
A good IRR depends on your required rate of return and risk tolerance. Generally, IRRs above 10-15% are considered good, though this varies by industry and investment type. Compare IRR to your cost of capital or hurdle rate.
What if my IRR is negative?
A negative IRR indicates the investment loses money over its lifetime. This suggests the investment may not be worthwhile unless there are other non-financial benefits.
How does IRR differ from ROI?
ROI is a simple percentage return, while IRR accounts for the timing of cash flows. IRR is more accurate for investments with multiple cash flows over time, as it considers the time value of money.
Can an investment have multiple IRRs?
Yes, investments with alternating positive and negative cash flows can have multiple IRRs. This is rare but can occur with complex cash flow patterns. Most standard investments have a single IRR.
Expert Reviewed
This calculator was reviewed by NumCalculators Editorial Team, Multi-disciplinary Expert Team