ToolPony.comDocumentation

Internal rate of return calculator

Find the annual effective rate from irregular annual flows or a terminal value and regular deposits or withdrawals.

Get started

  1. Use the example values or enter your own measurements.
  2. Calculate, then copy the result or download the available details.

Example

Input

55,000 outlay with 14,000, 18,000, 22,000, 26,000 inflows

Expected result

IRR ≈ 15.093%

Try it

Good to know

The calculation runs in your browser. Use consistent units in fields with no explicit unit.

Calculation method

IRR is a rate that makes net present value zero. Fixed-mode cash flows use the selected payment frequency and beginning or ending timing. Choose whether a beginning-of-period payment is also counted at the terminal boundary. The rate search covers −99.9999% to 10,000%.

0=∑i=0nFi(1+r)ti0=\sum_{i=0}^n\frac{F_i}{(1+r)^{t_i}}

Calculation mode

Irregular annual flows
  • Initial investment
  • Subsequent annual cash flows
Fixed flows and ending balance
  • Initial investment
  • Whole years
  • Additional months
  • Ending balance
  • Payment amount
  • Payment type · Withdrawal / Deposit
  • Payments per year · 1 / 2 / 4 / 12 / 24 / 26 / 52
  • Payment timing · End of period / Beginning of period
  • Include the terminal payment in beginning mode