IRR Calculator (Simple)

Calculate Internal Rate of Return (IRR) from a series of cash flows.

Return Snapshot

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IRR is the discount rate where the project NPV becomes 0.

Search bracketlow: — • high: —

Cash flows (t0, t1, t2...)

Paste one value per line (or use commas). Start with initial investment at t0 (often negative).

IRR

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NPV at IRR

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Periods

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Tip: IRR may have multiple solutions for unusual cash flows (multiple sign changes). This simple calculator returns the first solution found by bracketing.

Result—

Example: cash flows -1000, 300, 400, 500 → IRR ~12%

Formula

Find r such that Σ CFₜ / (1 + r)ᵗ = 0