How to Use This Tool
Zone Calculator: Enter your age and optionally your resting heart rate. The tool instantly shows all 5 training zones with your Zone 2 range prominently highlighted.
Karvonen Method: For more accurate zones, add your resting heart rate. The Karvonen formula uses heart rate reserve for personalized zones, especially useful for trained athletes.
MAF Method: Dr. Maffetone’s formula gives you a single aerobic training ceiling. Track your pace at this heart rate monthly to measure aerobic development.
Fat Burning Analysis: See exactly how many calories from fat you burn at each zone intensity and duration.
For best results, measure your resting heart rate first thing in the morning. This is an educational tool — consult your physician before starting any exercise program.