Estimate a Zone 2 heart-rate range using 60–70% of a measured or age-predicted maximum heart rate.
There is no single universal definition of “Zone 2.” This calculator uses a transparent 60–70% of maximum-heart-rate convention for a general estimate, not an individualized exercise prescription.
Maintained by Live Fitness Check. Last updated: August 13, 2026. How we test our calculators .
It uses 60–70% of the maximum heart rate entered or estimated. Other training systems may define Zone 2 differently.
Different calculators may use percentages of maximum heart rate, heart-rate reserve, lactate thresholds or other physiological markers.
A responsibly measured value can be more individualized than an age equation, but medical conditions and medications still need professional consideration.
