About

About CalcVault

A small, fast set of free calculators for the numbers that come up day to day — splitting a bill, working out a mortgage payment, checking your BMI, or solving a bit of math.

What it is

CalcVault is a collection of free online calculators covering everyday tools, finance, health and fitness, and math. Every calculator runs entirely in your browser: there's no account to create, nothing to install, and the numbers you enter never leave your device.

How it's built

The whole site is plain HTML, CSS, and JavaScript with no tracking beyond simple, anonymous traffic measurement. That keeps pages quick to load on any phone and keeps your inputs private. Formulas follow widely used standards, and each tool is tested against known values.

How it stays free

The site is supported by advertising. That lets the calculators stay free for everyone, with no paywalls or sign-ups. See our privacy policy for how ads and analytics use cookies.

Who's behind it

CalcVault is an independent project maintained by the CalcVault team. Spotted a bug, a wrong result, or have a calculator you'd like to see? I'd genuinely like to hear it — reach out via the contact page.