Normal Heart Rate Ranges by Age

Age-Specific Normal Ranges

• The American College of Cardiology states that children under 4 years and 4-16 years have a normal QRS duration of less than 90 ms and 100 ms, respectively 1, 2
• The American College of Cardiology also states that adults (over 16 years) have a normal QRS duration of less than 110 ms 1, 2

Important Considerations for Interpretation

• Age-related changes in heart rate should be considered when evaluating whether a heart rate is normal, according to clinical guidelines 3