wikiHow Heart Rate from ECG Calculator To calculate the heart rate from an electrocardiogram (ECG or EKG) reading, you can use the following methods: Method 1: Counting the Number of R Waves: Locate an R wave on the ECG reading. R waves represent the depolarization of the ventricles. Start a timer or stopwatch. Count the number of R waves that occur within a specific time frame, such as 6 seconds. Multiply the number of R waves by 10 to get the heart rate in beats per minute (BPM). This compensates for the 6-second time frame and extrapolates it to one minute. For example, if you count 10 R waves within 6 seconds, the heart rate would be calculated as 10 x 10 = 100 BPM. Method 2: Measuring R-R Intervals: Measure the distance between two consecutive R waves on the ECG strip. This distance is called the R-R interval. Calculate the time duration of the R-R interval. Divide 60 seconds by the duration of the R-R interval to obtain the heart rate in BPM. For example, if the R-R interval measures 0.8 seconds, the heart rate would be calculated as 60 / 0.8 = 75 BPM. It's important to note that these methods provide estimates of the heart rate, and more precise measurements may require specialized tools and analysis. Additionally, interpretation of an ECG should be performed by a qualified healthcare professional for an accurate assessment of heart health. Page