Free financial calculators

Each calculator shows the formula it uses, lists the assumptions behind the result, and states plainly what it does not do. Nothing here asks for an email address, and nothing here asks you to sign up for anything.

HomeMortgage Payment CalculatorMonthly P&I, full PITI, amortization schedule and the effect of extra payments.10 guides · Calculate →HomeRent vs Buy CalculatorMonthly cost, upfront outlay, equity build-up and the crossover month.5 guides · Calculate →InvestingCompound Interest CalculatorBalance, contributions, interest earned and the inflation-adjusted value.4 guides · Calculate →

What these tools are

These are arithmetic tools. They take the numbers you supply, apply a published formula, and hand the result back with the working attached. A mortgage calculator here does not know your credit score, your income, or which lender is offering what this week, and it does not try to guess.

The reason is simple: a number you can check is worth more than a number someone else picked for you. Every tool here shows the formula in symbols, links to the primary sources behind the method, and carries a review date so you can see when it was last checked.