Zone 2 Calculator
Calculate your heart rate zones for Zone 2 training based on age and resting heart rate using the Karvonen formula.
Published by:
isCalculator Editorial Team
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How to use this tool?
How to Use the Zone 2 Calculator
- Enter your Age (in years, between 1 and 120).
- Enter your Resting Heart Rate (in beats per minute, between 30 and 150 bpm).
- Click the "Calculate Zone 2" button.
- Your Zone 2 heart rate range will appear below, showing the lower and upper limits in bpm.
What it calculates:
The calculator uses the Karvonen Formula with a maximum heart rate estimated as 220 − age. Zone 2 corresponds to 60% to 70% of your Heart Rate Reserve (max HR minus resting HR).
Note: All inputs are in standard units (years and bpm). No metric/imperial conversion needed.
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Frequently Asked Questions
Zone 2 training refers to exercising at a heart rate that is 60-70% of your heart rate reserve, which is considered a moderate intensity that improves aerobic endurance.
Zone 2 is calculated using the Karvonen formula: Target HR = ((Max HR - Resting HR) × 0.6 to 0.7) + Resting HR, where Max HR = 220 - age.
Resting heart rate accounts for individual fitness levels, making the zone calculation more personalized than using percentages of max heart rate alone.
