About FinExplained

FinExplained is a personal-finance site built on one idea: a money answer is only worth as much as the math behind it. So we show the math. Every calculator here exposes its formula, a worked example, its assumptions, and the source behind each figure, so you can check the work instead of trusting a black box.

Our mission

Most money calculators online are black boxes: you enter numbers, you get a result, and you have no idea whether the math is right or what it assumed. We do the opposite. The goal is to explain personal finance in plain language, show the full calculation, and skip the hype, so a decision you make here is one you actually understand.

Why you can trust the math

Trust here is earned by how the tools are built, not by a title. Every calculator runs on one shared engine, so a formula is defined once and reused everywhere with nothing to drift out of sync. The money math is decimal-precise, checked against known-correct results to the cent by an automated test suite, and each change ships only after it passes that suite plus a set of build guards. Nothing goes out red.

Read how we build and verify our calculators

Where our numbers come from

The figures behind the math come from primary sources: the IRS for tax brackets and limits, the SSA for the Social Security wage base, the BLS for inflation data, and other official bodies. We cite them on the page and gather them in one place, and year-stamped figures are reviewed on an annual checklist so nothing silently goes stale.

See our sources

Who is behind it

Sam Sage, Founder, FinExplained

Sam Sage is an individual investor with more than 20 years of hands-on experience, managing a long-term, buy-and-hold portfolio and running an options wheel strategy of cash-secured puts and covered calls. Sam Sage is not a licensed financial advisor; FinExplained is educational content, not personalized advice.

More about Sam Sage and how the numbers are produced

Plainly: Sam Sage writes and is accountable for this site. Sam Sage is not a licensed financial advisor, broker, CPA, or planner, and holds no professional financial credential. Nothing on FinExplained is personalized financial advice or a recommendation for your situation. It is general education. For decisions about your own money, talk to a qualified professional.

Read our editorial standards and how we use AI

How we make money

Honesty about money includes our own. Today FinExplained earns nothing: there are no ads, no affiliate links, and no paid placements. As the site grows we plan to add advertising and, in some cases, affiliate links to products we would genuinely recommend. When we do, it will be disclosed plainly, advertising will stay light and never break a calculator, and affiliate links will carry a clear, per-link disclosure. Our recommendations will never be for sale.

See our affiliate disclosure and privacy policy for details.

Questions or corrections?

We read every message and fix mistakes quickly. See our corrections policy.