StealthEX is a free online calculator platform designed to make everyday math simple, fast, and completely private. We build tools that anyone can use — no accounts, no fees, no data collection.
We launched StealthEX in 2025 because we believed that something as basic as calculating a percentage shouldn't require downloading an app, creating an account, or being tracked by advertisers. Our goal is to provide useful, no-nonsense math tools that work instantly in any browser.
Our first tool — the StealthEX Percentage Calculator — covers six calculation modes: percentage of a number, finding what percentage one number is of another, percentage change, percentage increase, percentage decrease, and a full tip calculator with bill splitting.
We believe everyday tools should be free, fast, and private. Whether you're a student calculating exam scores, a professional working on budgets, or someone figuring out a dinner tip — you deserve a tool that just works without any strings attached.
Students calculating grades, averages, and homework problems. Professionals working with financial data, budgets, and reports. Shoppers figuring out discounts and sale prices. Diners splitting bills and calculating tips. And anyone who needs a quick percentage answer.
Accurate to 4+ decimal places on every calculation.
Instant answers — no loading, no delays.
All math runs in your browser. Zero data leaves your device.
Clean, distraction-free interface. Just the tool.
Questions or suggestions? Visit our Contact page or email [email protected].