A collection of useful calculators built with vanilla HTML, CSS, and JavaScript.
Calculate your body fat percentage using the official US Navy method based on body circumference measurements.
Calculate your body fat percentage using the official US Army single-site abdominal circumference method.
Convert between power output (watts) and pace for Concept2 rowing machines with bidirectional real-time conversion.
Detect beats per minute by tapping to the rhythm. Configurable sample size and timeout for accurate tempo measurement.
Real-time compass using device orientation sensors. Works on mobile devices with magnetometer for navigation and heading display.
Visit the live site: https://guyru.github.io/calculators/
- Pure HTML/CSS/JavaScript - No frameworks or build process
- Responsive design - Works on desktop and mobile
- Offline capable - All calculations done client-side
This project is open source and available under the MIT License.