About FinanceLearn

FinanceLearn is a sister of EconLearn. That site teaches AP Economics with graphs you can drag. This one does the same job for the arithmetic behind money: what a paycheck keeps, what a loan costs, and what a deal model is actually pricing.

Each page states the formula, runs it in your browser, and works through the same calculation by hand so you can check it. Nothing here needs an account.

How the numbers are checked

Every worked example carries a machine-readable record of its inputs and its published answers. Before the site can build, a separate program recomputes each one from scratch using a different method: loan figures by stepping through the full payment schedule rather than the closed formula, growth figures by iterating period by period. The build fails if any published number disagrees, and it fails again if a number that was computed correctly was typed into the prose wrongly.

Scope

This is educational material, not financial advice. The calculators show what a formula produces from the inputs you give it. Your own rate, fees, taxes and timing decide what actually happens, and a decision about your money is worth taking to someone licensed to advise on it.

Start with a path: a first paycheck, a first mortgage, or a first deal model. Or browse every calculator, the long-form guides, or every formula on one page.