IRR Calculator

About the IRR Calculator

An IRR calculator (Internal Rate of Return calculator) computes the discount rate at which the Net Present Value (NPV) of a series of cash flows equals exactly zero — representing the annualised effective return rate that makes an investment break even on a present-value basis. IRR is the fundamental metric used in capital budgeting, private equity, real estate investment analysis, and venture capital to compare the profitability of investments with different cash flow timing and duration. Unlike simple ROI, which ignores the time value of money, IRR accounts for when cash flows occur — an investment returning $100,000 in year 1 is more valuable than one returning $100,000 in year 10. Our free IRR calculator accepts any series of positive (inflows) and negative (outflows) cash flows, computes the IRR to two decimal places, and compares it to a user-specified hurdle rate (minimum acceptable return) to determine whether the investment creates or destroys value.

How It Works

IRR is the rate r that solves: 0 = CF0 + CF1/(1+r) + CF2/(1+r)^2 + ... + CFn/(1+r)^n, where CF0 is typically the initial investment (negative number). There is no closed-form solution — IRR is computed by numerical iteration (Newton-Raphson method). Example: invest $100,000 today (CF0 = -100,000), receive $30,000/year for 5 years. IRR = the r that satisfies: 0 = -100,000 + 30,000/(1+r) + 30,000/(1+r)^2 + 30,000/(1+r)^3 + 30,000/(1+r)^4 + 30,000/(1+r)^5. Solving: IRR ≈ 15.24%. If your hurdle rate (cost of capital) is 10%, this investment creates value (IRR > hurdle rate). If hurdle rate is 18%, reject the investment.

Tips & Best Practices

• ✓IRR assumes reinvestment of intermediate cash flows at the IRR rate itself — often unrealistically high. The Modified IRR (MIRR) addresses this by specifying separate financing and reinvestment rates.
• ✓Multiple IRRs: projects with non-conventional cash flows (more than one sign change) can have multiple IRRs, making interpretation ambiguous. NPV analysis is more reliable in these cases.
• ✓IRR versus NPV: IRR is a percentage metric — easy to compare across projects. NPV is an absolute dollar value — better for maximising total wealth creation. Use both together for complete analysis.
• ✓Private equity benchmark: venture capital funds typically target 20-30% IRR; real estate private equity targets 12-18% IRR; leveraged buyout funds target 20-25% IRR.
• ✓Real estate IRR includes rental income (cash inflows) and the property sale proceeds (large terminal cash flow) against the purchase price and holding costs (outflows).
• ✓Time-weighted return versus IRR: IRR is an investment-level metric measuring the return on deployed capital. Time-weighted return (TWR) measures the portfolio manager's skill independent of timing of capital flows.
• ✓IRR and deal structure: in private equity, the GP (general partner) earns carried interest (typically 20% of profits) above a preferred return hurdle — often 8% IRR — making precise IRR calculation critical for compensation.
• ✓IRR limitations: IRR does not account for the scale of an investment. A 50% IRR on $10,000 creates far less value than a 20% IRR on $10,000,000 — always consider NPV alongside IRR for capital allocation decisions.

Who Uses This Calculator

Corporate finance teams evaluate capital expenditure proposals, comparing the IRR of each project against the company's Weighted Average Cost of Capital (WACC) to identify value-creating investments. Private equity and venture capital investors screen deals by computing IRR on proposed investment structures. Real estate investors calculate property investment IRR across the expected hold period including rental income and exit proceeds. Project managers present IRR to management for large infrastructure or technology investment approvals. Students in MBA finance courses master IRR as a core capital budgeting concept. Investment bankers model acquisition IRRs for leveraged buyout analyses.