About HDPC

About HDPC

HDPC — Handy Daily Purpose Calculators is a collection of free online calculators, converters, and tools built for everyday use.

Our Mission

We believe useful tools should be free, fast, and private. Every tool on HDPC runs entirely in your browser — your data never leaves your device, and you never need to create an account.

How It Works

Every calculator and converter on this site is built with standard web technologies (HTML, CSS, and JavaScript). When you use a tool, all processing happens right on your device. Nothing is uploaded to a server. Nothing is stored in a database. Nothing is tracked.

What We Offer

• Calculators for math, finance, health, and everyday life
• Converters for units, temperatures, currencies, and more
• Developer tools for encoding, formatting, and converting data
• Text tools for writing, editing, and analyzing content

Privacy First

We take privacy seriously. Our tools have no backend, no user accounts, no cookies for tracking, and no data collection during tool use. Your calculations stay on your device.

Contact

Have a suggestion for a new tool? Found a bug? We’d love to hear from you. Visit our contact page to get in touch.