About OpenCalculator

OpenCalculator is a free online toolkit — a growing collection of calculators, converters and generators designed to solve small everyday problems quickly. From working out a loan EMI to generating a QR code for your shop, our tools are built to be fast, simple and private.

Our philosophy

• Free forever: every tool is free with no accounts, trials or paywalls.
• Private by design: all calculations happen in your browser. We don't see or store what you type.
• Made for India: GST slabs, rupee formatting, UPI-ready QR codes — built with Indian users in mind, useful for everyone.
• Mobile first: most of our visitors are on phones, so every tool is designed for small screens.

What you'll find here

Financial calculators (EMI, GST), everyday utilities (age calculator, unit converter), content tools (word counter), security tools (password generator) and more. We add new tools regularly based on what users ask for.

Questions or suggestions? Visit our contact page — we read every message.