Learn essential techniques for calculating heart rate in both regular and irregular ECG rhythms in this comprehensive video tutorial. Master various methods including square counting, 300 method, 1500 method, and the six-second method for accurate heart rate determination. Explore how to assess regularity in ECGs and practice your skills with sample ECGs. Gain valuable insights into rate calculation for heart block rhythms and irregular ECGs, enhancing your ECG interpretation abilities for medical exams like USMLE and NCLEX or clinical practice.