This calculator helps you determine the heart rate from an electrocardiogram (ECG) strip. Accurate heart rate calculation is crucial for diagnosing various cardiac conditions.
Standard speed is 25 mm/sec.
Results:
How to Calculate ECG Heart Rate
The heart rate on an ECG strip can be calculated using several methods. The most common and reliable methods involve measuring the R-R interval (the time between two consecutive R waves in the QRS complex) or using the grid paper markings.
Method 1: Using the R-R Interval
This method is generally the most accurate, especially for regular rhythms. The formula is:
Heart Rate (bpm) = 60 / R-R Interval (seconds)
To use this formula, you need to know the R-R interval in seconds. If you measure the R-R interval in small boxes on standard ECG paper (where each small box is 0.04 seconds), you can adapt the formula:
Count the number of small boxes between two consecutive R waves.
Heart Rate (bpm) = 60 / (Number of small boxes * 0.04)
Alternatively, if you know the strip speed: Heart Rate (bpm) = (Number of small boxes * 150) / Number of large boxes (where a large box is 5 small boxes or 0.20 seconds)
Method 2: Using the 3-Second Strip Method (for estimating rate)
This is a quick estimation method. ECG paper typically has markings at the top every 3 seconds.
Count the number of QRS complexes within a 3-second strip.
Multiply that number by 20 (since there are 60 seconds in a minute, and 60 / 3 = 20).
Heart Rate (bpm) ≈ Number of QRS complexes in 3 seconds * 20
This method is less accurate for irregular rhythms.
Interpreting Heart Rate Ranges:
Normal Sinus Rhythm: 60-100 bpm
Bradycardia (slow heart rate): Below 60 bpm
Tachycardia (fast heart rate): Above 100 bpm
Please note that these are general guidelines. Medical interpretation of ECGs should always be performed by a qualified healthcare professional.