Your heart rate is the number of beats per minute. What is your heart rate if you count 18 beats in 15 seconds?
Your heart rate would be 72 beats per minute.
To calculate, you can use the formula:
Heart Rate = (Number of beats counted in 15 seconds) x 4
Since 15 seconds is one-fourth (0.25) of a minute, you need to multiply the beats counted by 4 to get the heart rate per minute.
So, Heart Rate = 18 x 4 = 72 beats per minute.