Zone 2 Heart Rate Calculator
Estimate a Zone 2 heart-rate range and explain why different methods can produce different ranges.
Enter or adjust the values above, then calculate.
Zone 2 Heart Rate: estimate Zone 2 Range
Estimate a Zone 2 heart-rate range and explain why different methods can produce different ranges.
Inputs this tool uses
- Age
- Resting heart rate
- Method
What you get
Zone 2 planning range using the selected method.
How to use the Zone 2 Heart Rate Calculator
- Enter age, resting heart rate, method.
- Select any method, activity level or option shown on this page, then choose Calculate.
- Read the main result together with the supporting values, method, assumptions and limitations below before using the estimate.
How this calculation works
Heart-rate tools use transparent age-predicted maximum-heart-rate equations and, where selected, heart-rate reserve (Karvonen) arithmetic.
Example calculation
The sample values loaded into the calculator produce 111–130 bpm. This example exists to show how the output is structured; replace the sample values with your own inputs for your calculation.
Assumptions and limitations
- Energy, fitness and heart-rate outputs are estimates and vary by individual and device.
- Stop exercise and seek appropriate care if you have concerning symptoms; this tool does not provide medical clearance.
Sources and review status
Source set last verified 2026-09-25. No clinician review is claimed unless a real named reviewer is displayed.
Questions people ask about Zone 2 Heart Rate Calculator
Why do Zone 2 numbers differ between calculators?
Zone 2 depends on the method used. Percent-of-max and heart-rate-reserve approaches can produce different ranges, and neither is a universally exact physiological boundary.
Connected tools
Continue with the closest related calculation without re-entering sensitive values automatically.
Compare age-predicted maximum heart-rate equations and explain individual variability.
Open tool →♥Target Heart Rate CalculatorCalculate a target heart-rate range using percent of max HR or heart-rate reserve/Karvonen mode.
Open tool →♥Heart Rate Zone CalculatorBuild a five-zone heart-rate table using percent of max HR or heart-rate reserve.
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