Your Body
How many times does your heart beat in a day?
The short answer
About 100,000 times. At a typical resting rate of around 70 beats a minute, that is roughly 100,000 beats a day, 35 million a year, and well over two billion in a lifetime. It never takes a break, and it does the whole job with a muscle about the size of your fist.
The arithmetic is simple and the result still lands oddly. Seventy beats a minute is 4,200 an hour, which is just over 100,000 a day. Nothing else you own runs that hard without maintenance. A car engine idling at the same rate would be in a garage within a year.
Each beat moves only a small cupful of blood, but the cupfuls add up to around 7,500 litres a day, enough to fill a small bathroom several times over. The heart manages this by never fully working: each chamber rests between squeezes, so across a day it is relaxed slightly longer than it is contracting.
The heart also has its own electrical pacemaker, a patch of cells that fires on its own schedule. That is why a heart can keep beating for a short while outside the body during a transplant. It does not wait for instructions from the brain. It has a job and it gets on with it.
Source
- Fun Facts About Your HeartCleveland Clinic