About

Tools that teach

A calculator you understand beats one you just trust.

How we build

Every calculator is paired with a guide that explains the formula and the assumptions, so the answer is legible, not magic.

Sam Ortega · Finance educator

Sam builds finance tools and writes the explainers that go with them, turning intimidating math into something you can reason about.

Some links to financial products are affiliate links, at no cost to you. The calculators stay neutral.