Heart Rate Zones Calculator

What this calculator does

Heart rate zones help estimate exercise intensity. This calculator shows age-predicted maximum heart rate and common training ranges.

Formula used

Maximum heart rate is estimated as 220 minus age. Zone ranges are shown as percentages of maximum heart rate, with a heart rate reserve comparison using resting heart rate.

How to read the result

These are general estimates. Medication, health conditions, heat, fatigue and fitness level can change heart rate response.

Assumptions

• Uses 220 minus age for maximum heart rate.
• Shows common percentage zones.
• Not medical advice.

Sources and checks

Source links are included so you can check important formulas, thresholds and assumptions.

• American Heart Association target heart rates

Frequently asked questions