Medically the review by Debra Sullivan, Ph.D., MSN, R.N., CNE, COI — created by Rachel Nall, MSN, CRNA — to update on July 18, 2017

You are watching: What is the blood volume of an average sized adult male


The amount of blood in the human being body is generally equivalent to 7 percent of body weight. The mean amount that blood in her body is one estimate because it deserve to depend on how much you weigh, her sex, and also even wherein you live.

Babies: Babies born full-term have around 75 milliliters (mL) that blood every kilogram of your body weight. If a baby weighs about 8 pounds, they’ll have around 270 mL that blood in their body, or 0.07 gallons. Children: The typical 80-pound kid will have about 2,650 mL that blood in your body, or 0.7 gallons. Adults: The mean adult weighing 150 come 180 pounds have to have about 1.2 to 1.5 gallons of blood in their body. This is about 4,500 come 5,700 mL. Pregnant women: To assistance their farming babies, pregnant women usually have almost everywhere from 30 to 50 percent more blood volume than ladies who room not pregnant. This is about 0.3 come 0.4 extr gallons the blood.

Sometimes the quantity of blood in the person body deserve to differ based upon where girlfriend live. For example, civilization who live at high altitudes have much more blood because there isn’t as lot oxygen at greater altitudes.

If you lose too lot blood, your mind doesn’t get sufficient oxygen to assistance life. World who experience major injury and trauma, such together a automobile accident, may shed blood really quickly. Shedding an extreme amount the blood is known as hemorrhagic shock. Doctors categorize hemorrhagic shock into four classes based upon how much blood is lost. In class IV, the lot of blood loss deserve to be fatal.

Here room the class of hemorrhagic shock:

class Iclass IIclass IIIclass IV
blood loss (mL)up to 750750 to 1,0001,500 come 2,000greater than 2,000
blood lose (% that blood volume)up come 1515 come 3030 to 40greater than 40
pulse price (per minute)less than 100100 to 120120 to 140greater 보다 140
blood pressurenormal or increaseddecreaseddecreaseddecreased
respiratory price (per minute)14 come 2020 to 3030 to 40greater than 35
urine output (mL every hour)greater than 3020 to 305 to 15negligible
mental statusslightly anxiousmildly anxiousanxious, confusedconfused, lethargic

Your blood pressure and heart price will remain close to common as you lose up come 30 percent of her blood, or approximately 1,500 mL that blood (0.4 gallons). After losing this quantity of blood, you will experience the following:

You’ll begin to have actually a fast heart rate greater than 120 beats every minute.Your blood pressure will drop.Your breathing rate will walk up.

If friend lose an ext than 40 percent of your blood, you will certainly die. This is around 2,000 mL, or 0.53 gallons of blood in the mean adult.

It’s vital to gain to a hospital to begin receiving blood transfusions to prevent this.

Learn more: how long does a blood transfusion last? »

Your physician won’t usually directly measure the quantity of blood that you have because they can estimate it based on other factors and also tests. Because that example, a blood test well-known as a hemoglobin and also hematocrit test deserve to estimate just how much blood is in her body compared with the lot of liquid in her body. Then, your medical professional can take into consideration your weight and how character language you most likely are. All of these determinants can indirectly measure just how much blood volume you have.

If you suffer a significant trauma that causes blood loss, physicians will generally use her weight together the starting point to guess exactly how much blood you have. They will certainly then use factors like her heart rate, blood pressure, and breathing price to estimate how much blood may have actually been lost. They’ll also try to keep track of any additional blood loss therefore they can easily replace it through a blood transfusion.

Read more: just how to lower your heart rate »


See more: This Northwest Pit House Was Built So That It Could, A World History Of Architecture

Medically the evaluation by Debra Sullivan, Ph.D., MSN, R.N., CNE, COI — created by Rachel Nall, MSN, CRNA — to update on July 18, 2017