Finance
IRR Calculator for Uneven Cash Flows
Estimate the internal rate of return for an initial investment followed by equal periodic cash inflows and a terminal value. The calculator uses 0 = −initial investment + Σ cash flow_t ÷ (1 + IRR)^t. It returns more than one result so you can check the main answer against a useful secondary measure. IRR is the rate that makes net present value approximately zero. Multiple sign changes can create multiple IRRs; compare NPV at a defensible required return.
Educational scenario only. Confirm rates, fees, taxes, contract terms, and eligibility with the relevant institution or adviser.
Calculate and compare
Use the number box for precision or the slider for fast scenario testing.
Scenario results
Estimated IRR
12.06%
Binary-search solution for the entered cash-flow pattern.
NPV at required return
$8,157.86
Discounted at 10%.
Undiscounted net cash
$66,000
Simple cash total without time value.
How the calculation works
Use consistent units and retain full precision until the final display step.
Worked example
Reproduce the displayed scenario, then change one assumption at a time.
Assumptions behind the result
- • Inputs use the units shown beside each control.
- • The displayed formula is applied without hidden market or demographic data.
- • Rounding occurs only for display; calculations keep full numeric precision.
- • IRR is the rate that makes net present value approximately zero.
- • Multiple sign changes can create multiple IRRs; compare NPV at a defensible required return.
Mistakes that change the answer
- • Mixing percentages with decimals or mixing incompatible units.
- • Relying on a rounded intermediate value instead of the full result.
- • Changing several assumptions at once instead of testing initial investment separately.