The heart rate zone calculator is a free online tool that helps you convert between health units quickly and accurately. It supports 2 units including Beats per minute (bpm), Beats per second (bps). The core conversion formula is: Max HR = 220 - age | Zone 1 (50-60%), Zone 2 (60-70%), Zone 3 (70-80%), Zone 4 (80-90%), Zone 5 (90-100%). For example, 1 Beats per minute equals approximately 60 Beats per second. Conversely, 1 Beats per second equals approximately 0.016667 Beats per minute. Common conversions: 5 bpm = 300 bps, 10 bpm = 600 bps, 25 bpm = 1,500 bps, 50 bpm = 3,000 bps, 100 bpm = 6,000 bps. This converter is useful for students, engineers, scientists, and professionals who need accurate health unit conversions. Whether you are working on homework, technical specifications, research data, or everyday measurements, this tool provides instant, reliable results. All conversions are calculated relative to a single base unit for consistency and precision across all supported units. Resting heart rate for adults is typically 60-100 bpm. Athletes may have resting heart rates as low as 40-60 bpm.