Calculators

Calculators that I find useful.

Navy Body Fat Calculator

Figure out your body fat percentage using the Navy's circumference measurements method.

Army Body Fat Calculator

Calculate body fat percentage using the Army's single-site abdominal circumference method.

Concept2 Watts ↔ Pace Calculator

Convert between watts and pace for Concept2 rowing machines. Goes both ways in real time.

Tap Tempo BPM Calculator

Detect beats per minute by tapping to the rhythm. Configurable sample size and timeout for accurate tempo measurement.

Digital Compass

Real-time compass using device orientation sensors. Works on mobile devices with magnetometer for navigation and heading display.

Rowing Training Bands Calculator

Calculate personalized training zones based on your max heart rate, resting heart rate, and 2000m erg performance.

One Rep Max (1RM) Calculator

Calculate your estimated one-rep max using Epley's formula. Includes a complete rep-max table for training planning.