Internal Rate of Return (IRR) Calculator

What is IRR?

IRR is the annualized return an investment earns. Compare it with your required rate: above it, the investment is worth taking.

How it works

We solve for the rate where NPV equals zero using bisection on the cash-flow polynomial — the same convention spreadsheet IRR functions use.

1. Enter your input. Type or paste your input into the field above — the tool responds instantly.
2. Review the result. Output updates live as you type. Everything runs entirely in your browser.
3. Copy or download. Use the Copy button to grab the result, or Download to save it as a file.

Examples

Realistic sample

Type or paste any realistic input — the tool computes the result locally and instantly.

Common mistakes

Expecting a server round-trip

Nothing is uploaded — every tool in this category runs entirely in your browser.