Aspire intensity calculator
Heart-rate zones.
Build five practical zones using heart-rate reserve, resting heart rate and either measured or age-predicted maximum heart rate.
Calculate your zones.
Leave measured maximum blank to use the Tanaka age-prediction equation.
Free report
Email your five-zone table.
Calculated maximum:
Important
Age-predicted maximum heart rate has meaningful individual error. Measured thresholds and exercise testing provide more individual precision.
Public evidence
Tanaka maximum-heart-rate equation
Heart-rate reserve and oxygen reserve
Method and limitations.
Maximum HR: 208 - (0.7 x age), unless a measured value is entered.
Target HR: resting HR + percentage x heart-rate reserve.
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