ECG Heart Rate Calculator

Your details

Pick the measurement you have. The RR-interval method is the most precise; the box rules are quick mental shortcuts; the 6-second method works for irregular rhythms.
Standard ECG paper runs at 25 mm/s. Some paediatric and tachycardia recordings use 50 mm/s. Selecting the wrong speed will halve or double your result.
Measure peak-to-peak distance between two adjacent R waves on the ECG paper in millimetres.
mm
Heart RateNormal rate
75bpm

Beats per minute derived from your ECG measurement

RR interval duration0.8s
RR interval duration800ms
Rhythm classificationNormal sinus rate (60-100 bpm)
75 bpm
Severe bradycardia<40Bradycardia40-60Normal60-100Tachycardia100-150Severe tachycardia150+

Heart rate: 75 bpm - Normal sinus rate (60-100 bpm)

  • A heart rate of 75 bpm is within the normal adult resting range of 60-100 bpm.
  • A normal sinus rate does not exclude arrhythmia: evaluate the rhythm, P-wave morphology, PR interval, and QRS width for a complete interpretation.
  • Heart rate was calculated using the RR-interval distance. For irregular rhythms like atrial fibrillation, the 6-second R-wave count gives a better average rate than single-interval methods.

Next stepHeart rate is one data point in ECG interpretation. Evaluate the rhythm, axis, intervals (PR, QRS, QT), and morphology for a complete clinical assessment.

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