Before building IRR Calculator, we checked calculator.net's IRR calculator directly.
Paste cash flows irr, instead of typing into 50 boxes
It supports up to 50 years of cash flows — which sounds thorough, until you look at the actual interface: a separate labeled field for "Year 1," "Year 2," and so on, up to "Year 50." If you've got your cash flows in a spreadsheet already, there's no way to paste them in — you're retyping each one into its own box.
Irr calculator multiple cash flows, pasted as one list
This tool is one text box: paste your cash flows, one per line, year 0 first. Works for 3 years or 30 — no fixed field count, no retyping.
Internal rate of return calculator, solved reliably
IRR is found with a bisection search rather than a Newton's-method-style approach — slightly slower, but it can't fail to converge the way derivative-based methods sometimes can on irregular cash flow patterns.
