Accuracy that looks good.
I built JustPercent out of simple frustration: most online calculators are ugly, clunky, and stuck in the 90s. I wanted a tool that didn't just crunch numbers, but felt good to use—whether you're quickly checking a tip on your phone or deep in your spreadsheet.
Built for Speed
Everything here has one job: get you the answer, fast.
- • Intuitive Navigation: Find exactly the calculator you need without digging.
- • Instant Results: Pages load fast. No waiting around.
- • Easy Inputs: Smart inputs and buttons that make entering data feel natural.
Design That Feels Good
I ditched the complex, outdated forms that clutter the web.
- • Looks: Clean, modern, and actually pleasant to look at.
- • Dark Mode: Full dark mode support, so it's easy on your eyes at night.
- • Focus: An interface designed to keep your attention right where it matters: the result.
Engineered for Accuracy
Trust is everything when it comes to numbers.
- • Financial Precision: I use precision math to reduce rounding errors.
- • Transparent Formulas: I show the exact formula used for every calculation, so you always know how the answer was found.
- • Private by Design: All math happens locally in your browser. Your numbers never leave your device. Learn more in the Privacy Policy.
JustPercent is built with a passion for the modern web.
Owned and operated by:
Bilargo — Michał Lipski
Aleja Partyzantów 51A
24-100 Puławy, Poland
Have a question or feedback? Reach out to me:
[email protected]