How Much Blood Does The Average Person Have In Their Body?

The amount of blood in the human body depends on size (body mass is more important than height). An average man of 150 lbs or 70 kgs will have around 8 pints or 5.2 litres of blood. A woman of 110 lbs (50 kgs) will have about 3.3 litres of blood ; about 5 pints. (However, 110 lbs is a petite size!). The average woman will have nearer 6-7 pints and with a male having eight, the average is just over 7 pints.
Children obviously have less blood. Tiny, premature babies may have as little as the equivalent of half a wine glass ful of blood.
As a general rule blood actually constitutes about 7-8 % of body weight. Some people can have as many as 12 pints of blood.
In one day blood can travel the equivalent of 12,000 miles and blood vessels laid end to end would reach around 62,000 miles.
Sever lack of blood can result in the heart not having enough blood to pump around and it can then go into shock which may result in a heart attack.

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