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Heart Rate Calculator


To calculate the Heart Rate enter the number of big and small squares that appear between two R waves.

This formula is only valid for Electrocardiograms with Regular Rhythm.

Heart Rate


5mm Squares

Remaining 1mm Squares


  • Bradycardia: Heart Rate less than 60 bpm.
  • Normal: Heart Rate between 60 bpm y 100 bpm.
  • Tachycardia: Heart Rate over 100 bpm).

Using the Heart Rate Calculator

Enter the number of 5mm squares and the remaining 1mm squares existing between an R wave and the next. (RR Interval).

Heart Rate Calculator

Example: Enter 3 big squares and 4 small squares


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