IRR Calculator
Calculate Internal Rate of Return (IRR) across fixed recurring streams and irregular uneven annual cash flows with interactive Net Present Value (NPV) sensitivity curves.
Internal Rate of Return (IRR) Calculator
Calculate the annualized discount rate that makes the Net Present Value (NPV) of cash inflows and outflows equal to zero for both fixed recurring streams and uneven irregular capital projects.
• Module 1 (Fixed Cash Flow): Computes IRR when you have an initial investment, a fixed periodic withdrawal or deposit stream, and a final ending balance.
• Module 2 (Irregular Cash Flow): Solves IRR for uneven annual capital calls and distribution series, alongside an interactive NPV discount sensitivity curve.
IRR based on fixed cash flow
This calculator computes the IRR based on a fixed recurring cash flow or no cash flow.
30.05%
annualized return over 2.50 yearsIRR based on irregular cash flow
This calculator computes the IRR based on the initial investment and subsequent annual cash flows. If you want to calculate the IRR for cash flows that are not annual, please use our Average Return Calculator.
12.45%
annualized return across 3 periodsNPV Sensitivity Curve ($ vs Discount Rate %)
IRR = 12.45% (NPV=0)Understanding Internal Rate of Return (IRR)
Internal Rate of Return (IRR) is a core metric in corporate finance, private equity, and capital budgeting. It represents the annualized compound rate of return that equates the present value of future cash inflows with the initial capital outlay.
The Net Present Value Equation
IRR is the exact discount rate at which the Net Present Value of all cash flows equals zero.
The Hurdle Rate Rule
If a project's IRR exceeds the company's cost of capital (or minimum hurdle rate), the investment generates economic value and is generally accepted.
Reinvestment Assumption
Standard IRR assumes all interim cash distributions can be reinvested at the same high IRR rate, which is why Modified IRR (MIRR) is sometimes used for conservative modeling.
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Understanding IRR Calculator & Formula
The IRR Calculator on CalculatorScale.com is engineered to deliver instant, mathematically verified calculations conforming strictly to standard institutional equations. Whether planning long-term investments, managing household budgets, tracking clinical fitness targets, analyzing academic genetics, calculating veterinary dosages, or converting dimensional units, every calculation updates dynamically in real time without lag.
Every formula used in this tool adheres to certified international standards, including World Health Organization biometric metrics, veterinary clinical guidelines, NIST physical conversion constants, and standard biological equations. Results are computed entirely client-side inside your browser with complete data privacy, ensuring your sensitive numbers and statistics never leave your device.
Our calculators are 100% free with no registration, subscriptions, or paywalls required. You can toggle between imperial and metric units, customize input parameters, export calculation summaries, or embed this calculator directly into your own website or blog.
How to Use the IRR Calculator
- 1 For Module 1 (Fixed Cash Flow): Enter your initial capital outlay ($), holding period (years & months), ending salvage balance ($), and recurring deposit/withdrawal amount and frequency.
- 2 For Module 2 (Irregular Cash Flow): Enter initial investment ($) and specify annual positive or negative cash flows for Year 1, Year 2, Year 3, etc. Use "+ Show More Input Fields" to add up to 30 years.
- 3 Click "Calculate" on either module to solve for the exact annualized IRR using high-precision numerical root-finding.
- 4 Review total inflows, total outflows, net profit, and the interactive NPV sensitivity curve plotting discount rates from 0% to 30%+.
IRR Calculator — Frequently Asked Questions
Q1 What is Internal Rate of Return (IRR)? ▾
Internal Rate of Return (IRR) is the annualized compound discount rate that makes the Net Present Value (NPV) of all cash inflows and outflows from a particular project or investment equal to zero.
Q2 How is IRR used in capital budgeting decisions? ▾
Companies use IRR to evaluate and rank potential capital investments. If a project's projected IRR exceeds the firm's cost of capital (or minimum hurdle rate), the project is expected to create economic value and is approved.
Q3 What is the difference between NPV and IRR? ▾
NPV calculates the net dollar value added to a firm at a specified discount rate, whereas IRR calculates the percentage rate of return generated by the project. When evaluating mutually exclusive projects of differing scales, NPV is generally preferred.
Q4 Can an investment have multiple IRRs or no IRR? ▾
Yes. If cash flows change signs multiple times (e.g., initial outflow, positive returns, followed by a major decommissioning cleanup outflow in later years), there can be multiple mathematical discount rates where NPV = 0. In such scenarios, Modified Internal Rate of Return (MIRR) is recommended.
Q5 What is the difference between fixed cash flow IRR and irregular cash flow IRR? ▾
Fixed cash flow IRR models predictable periodic annuity payments (like monthly loan payments or steady quarterly dividends) with a terminal balloon salvage value, while irregular cash flow IRR models lumpy, uneven annual private equity capital calls and distributions.
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