About MoneyMath

MoneyMath is a collection of free online calculators and unit converters. The aim is simple: give you a quick, correct answer without sign-ups, pop-ups or a cluttered page.

How it works

Every tool runs in your web browser. The numbers you type are processed on your own device and are not sent to our servers.

How we keep results accurate

Each tool uses a standard, published formula, and the page explains that formula with a worked example so you can check the answer yourself. If you ever spot a result that looks wrong, please tell us and we will look into it.

How the site is funded

The site is supported by advertising, which lets us keep every tool free. Ads are kept away from the calculators so they do not get in your way.

Results are estimates for general guidance. They are not financial, tax or legal advice.