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Free Heart Rate Zone
Calculator

Free advanced Heart Rate Zone Calculator with measured or predicted max heart rate, percent-max zones, heart-rate-reserve/Karvonen zones, lactate-threshold running zones, AHA moderate/vigorous ranges, live BPM lookup, formula comparison and custom five-zone boundaries.

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About Free Heart Rate Zone Calculator

Compare measured or age-predicted maximum heart rate, calculate five-zone %HRmax or heart-rate-reserve targets, switch to threshold-based running zones, inspect a live BPM, and keep the AHA moderate/vigorous ranges separate from sport-specific training zones.

Workspace options

  • Age · years
  • Maximum-HR source
  • Measured HRmax · bpm
  • Resting HR · bpm
  • LTHR · bpm
  • Z1 start %

Available actions

  • % HRmax · 5 zones
  • % HRR · 5 zones
  • LTHR run · 7 zones
  • Custom % · 5 zones
  • Use 30-sec pulse × 2
  • 120 bpm