How quickly your heart beats depends a little on what you're doing and the specifics of each person's individual body!
The average adult's heart beats about 70 times every minute. Of course, the number of beats per minute will speed up for certain circumstances (such as exercise or nervousness) and will also slow down for other circumstances (such as resting or sleeping).
A person's average number of heart beats will also vary depending on how healthy and fit that person is. Very athletic people usually have much lower heart rates when resting than other people some athletes' hearts beat only 40 to 60 times per minute when they are resting! But if you take the average of about 70 beats per minute and then multiply it by 1,440 minutes in a day, then you could roughly estimate that a person's heart beats about 100,800 times per day!
Have you ever wondered how big your heart is? Make a fist and take a look! The human heart is roughly the size of a fist!When the heart pumps blood, it travels through blood vessels all over the body. Because blood needs to reach all the different corners of the body, the average person has so many blood vessels that their length could circle twice around the world! A person has about six quarts of blood that these amazing blood vessels help to circulate!