About Global Calculator

Global Calculator is a free calculator platform built for speed. It currently hosts 42 calculators across 10 categories, and every one of them runs entirely inside your browser.

Nothing you type is uploaded, logged or stored. There is no account, no paywall and no interstitial — you open a page, the calculator is already there, and the answer updates as you type.

We also publish the maths. Each calculator page includes the formula it uses, a plain-English explanation, a worked example and answers to the questions people ask most, so you can check the result rather than trust it blindly.

Accessibility and mobile performance are treated as requirements rather than extras: semantic markup, keyboard-navigable controls, large tap targets, and pages that stay fast on a slow connection.