About FluxCalc

FluxCalc is a collection of free online calculators and developer tools built for speed, accuracy, and privacy. Every tool runs entirely in your browser — no data is ever sent to our servers, no account is required, and there are no usage limits.

Our Mission

We believe useful tools should be accessible to everyone. Too many calculator sites are bloated with ads, require sign-ups, or sell your data. FluxCalc takes a different approach: minimal design, maximum utility, zero friction.

What We Offer

• Finance tools — tax calculators, tip calculators, percentage calculators
• Developer tools — token counters, CSV/JSON converters, Unix timestamp converters, Markdown to HTML
• Design tools — aspect ratio calculators, color converters
• Everyday utilities — age calculators, date calculators, character counters, Roman numeral converters

Privacy First

All calculations happen locally in your browser using JavaScript. We don't collect personal data, we don't track individual users, and we don't sell information to third parties. We use minimal, privacy-friendly analytics to understand which tools are most useful so we can prioritize improvements.

Built With

FluxCalc is built with Next.js, TypeScript, and Tailwind CSS. We use modern web standards to ensure fast load times, accessibility compliance, and responsive design across all devices. Our tools work on desktop, tablet, and mobile.

Contact

Have a suggestion for a new tool? Found a bug? Want to collaborate? Reach out at hello@fluxcalc.com.