About CalcHub

CalcHub is a free, open collection of online tools designed to help you calculate, convert, and create — right in your browser.

Our Mission

We believe useful tools should be accessible to everyone, everywhere. No accounts, no paywalls, no data collection. Just open a tool and get your answer instantly.

What We Offer

89+ tools across 7 categories
4 languages — English, Russian, Spanish, Portuguese
Privacy-first — no user accounts, no personal data stored
100% free — every tool, every feature, no limitations
No signup — use any tool immediately
Mobile-friendly — works on any device

How It Works

All computation happens directly in your browser. When you use a CalcHub tool, your data stays on your device — nothing is sent to our servers. This means faster results and complete privacy.

Whether you are converting units, calculating a loan payment, generating a color palette, or formatting JSON, the processing runs entirely client-side using JavaScript and WebAssembly where needed.

Technology

CalcHub is built with modern web technologies for speed and reliability:

Astro — static site generation for fast page loads
React — interactive tool components
TypeScript — type-safe, maintainable code

Get in Touch

Have a suggestion, found a bug, or want to request a new tool? We would love to hear from you.