All 197 Free Online Calculators

Why a calculator per page

One page per calculation, rather than one page with a drop-down of fifty, is a deliberate choice. It means the page you land on explains the calculation you came for: the formula, a worked example, what it excludes, and the questions people ask about it. It also means a link you share goes to the thing you meant.

Every calculator shows its working. Where there is a formula, the page prints it with your own numbers substituted in; where there is a schedule, such as a loan or a savings plan, you can open the year-by-year table and check it. A figure you cannot check is a figure you should not rely on.

What they do not do

No calculator here is advice. The money ones exclude fees, tax and inflation unless they ask you for them; the health ones apply population formulas that cannot know your medical history; the material ones estimate quantities that depend on how the job is actually done. Each page states its own limits in plain words, and the disclaimer covers the rest.