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IRR Calculator

Internal rate of return on an investment

IRR — Internal Rate of Return

Cash Flows (one per line, first = initial investment negative)

The Internal Rate of Return (IRR) is the discount rate making an investment's NPV equal zero — the annualised effective return. Compare to your hurdle rate to decide whether to invest.

  1. 1Solve: 0 = Σ Cₜ/(1+IRR)ᵗ — iterative calculation
  2. 2IRR > hurdle rate → accept investment
  3. 3Multiple sign changes in cash flows can give multiple IRRs
  4. 4Useful for comparing investments of different sizes
−$10k initial; $3k, $4k, $5k, $6k over 4 years=IRR ≈ 22.8%
ComparisonDecision
IRR > hurdleAccept
IRR = hurdleMarginal
IRR < hurdleReject
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