Blood is a fluid substance which is one of the most intriguing and mysterious substances known to man, capturing the human imagination for most of your existence. It has played a very crucial part in the development of many aspects of your folklore, culture, religion, and spirituality. Blood is not only vital to your life but also downright frightening and complex with when it ceases to function normally.

Everybody has a different amount of blood in their body which also depends on their size and age. The amount of blood inside the human body is generally equivalent to 7% of the human body’s weight. The average amount of blood in your body is an estimate because it can also depend on your sex, how much you weigh and even where you live.

How you ever wondered how much blood you have in your body? Does everyone have the same quantity of blood?

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The Real Truth

Your blood is composed of plasma and cells. These cells consist of white blood cells, red blood cells, and platelets. The red blood cells carry oxygen from the lungs and give blood its red color. On the other hand, white blood cells are fighting the infections. And the platelets will help form clots to help your body stop from bleeding if there is a cut. All of the cells are floating in liquid plasma, that is commonly water. Plasma also contains electrolytes, hormones, nutrients and protein antibodies to help your body fight infection.

When it comes to the amount blood in the human body, it varies and depends on factors such as sex, age, overall health and where you live. For instance, men tend to have more blood when compared to women of comparable weight and size. Captivatingly, people who live at high altitudes tend to have 2 liters of extra blood when compared to those living in lower altitudes. Since the air at high altitude contains less oxygen, people living in this area need an extra blood to offer the sustainable amount of oxygen to lungs.

Scientists estimate that the volume of blood inside your body is approximately 7% of your body weight. An adult body with a weight of 150 to 180 pounds will contain approximately 4.7 to 5.5 liters of blood. A normal child with a weight of 80 pounds will have half the amount of blood as an adult.

Calculating Blood Volume

Your doctor may need to calculate the volume of blood for different reasons such as making sure that when you give blood, you are not donating more than what is safe for you or determining the amount of volume you would need during the surgery. There are several ways on how to determine your blood volume, and they may give you varied answers as well, but they should not greatly differ.

Calculating your Blood Volume as a Man

Using Nadler’s Equation

This method of calculating the total blood volume in milliliters. To do the calculation, you will need to weight in pounds and height in inches. The formula of the equation is (0.006012 x Height3) + (14.6 x Weight) + 604.

If you have your weight in kilograms and your height in centimeters, you need to convert it first in pounds and inches, respectively. 1 centimeter is equivalent to 0.39 inches, and 1 kilogram is 2.2 pounds. Calculate the height function first of the method. Cube the height in the inches form or multiply it three times and then multiply by 0.006012. After the height function, start calculating the weight function. Multiply the weight in pounds by 14.6. Add the weight function to the height function then add 604.

Estimating Total Volume of Your Blood

This method of calculating the volume of blood is using the average milliliter’s numbers of blood in every kilogram of the body’s weight that man has. It is also called as the reference book method.

The first thing to check is your weight; it should be in kilograms. If you have with you your weight in pounds, you need to convert it first to kilograms, where 1 pound is 0.45 kilograms. Multiply your body’s weight in kilograms times the average of men: 75 milliliters of blood per kilogram. This process will offer you an estimated volume of your blood in milliliters. If you want to know your blood volume in liters, where 1 milliliter is equivalent to 0.001 liter – multiply the blood volume in milliliters to liters by multiplying it by 0.001.

Using Gilcher’s Rule of Five

Not all types of the tissues have the same amount of blood in them. If a person is very thin or obese, it will also influence the accuracy of the calculations. This method makes necessary adjustments for this in projected blood amount per kilogram of the body weight. You need to convert your weight in pounds to kilograms by multiplying by 0.45. Then multiply your body mass in kilograms by one of these values to get your estimated blood volume in milliliters.

  • Normal men have 0.07 liter of blood per kilogram of your weight
  • Muscular men have 0.075 liter
  • Obese men have 0.06 liter
  • Thin men have 0.065 liter

Calculating Your Blood Volume as a Woman

Using Nadler’s Equation

The method on this will be the volume of your blood in milliliters. For you to do the calculation properly, you need to put your weight in pounds and height in inches into the following formula: (0.005835 x Height3) + (15 x Weight) + 183.

The first step to do is to convert your weight in pounds, and your height in centimeters to kilograms and inches where; 1 kilogram is 2.2 pounds and 1 centimeter is 0.39 inches. If you already have this information with you, then you can proceed to the computation.

Calculate height function first then dice your height in a form of inches and then multiply by 0.005835. After the height, calculate your weight function and multiply your weight in pounds by 15 then add the weight function and height function. Add 183. To convert milliliters to liters, multiply the blood volume in milliliters by 0.001.

Estimating your blood volume

This method of getting the blood volume is based on the average value of milliliters of blood per kilogram of the body weight women have.

To estimate the blood volume, you need to have your weight in kilograms. If you need to convert your weight to kilogram, multiply it in pounds by 0.45. Then, multiply your body weight in kilograms times the average for women, which is 65 milliliters of blood per kilogram. It will provide you with the estimated blood volume in milliliters. To convert milliliters to liters, multiply the blood volume in milliliters by 0.001.

Using Gilcher’s Rule of Five

Your level of fitness can cause you to deviate from the averages. The rule of five corrects this by adjusting the estimated amount of blood in kilogram of the body weight. Convert your weight in kilograms by multiplying by 0.45. Multiply your body weight by these averages according to your body condition.

  • Muscular women have 0.07 liters of blood per kilogram of your body weight
  • Thin women have 0.06 liters
  • Normal women have 0.065 liters
  • Obese women have 0.065 liters

Calculating your Child’s Blood Volume Based on Age

Determine Their Average Volume of Blood per Weight

If you know the age of the child, you can use these standards:

  • A newborn baby which is only 15 – 30 minutes old will have an average blood volume of 0.077 liters per kilogram
  • A newborn baby who is 24 hours old has 0.0833 liters per kilogram
  • A three-month-old baby has 0.087 liters per kilogram
  • A six-month-old baby has 0.086 liters per kilogram
  • A child whose age is between one to six years old has 0.080 liters per kilogram
  • A ten years old child has 0.075 liters per kilogram
  • A fifteen-year-old has 0.071 liters per kilogram. As teen each adult proportions and sizes, their blood volume will be the same as that of the adults.

Calculating the Blood Volume

All you have to do is to multiply your child’s weight to the average value of his or her age group; then the result will be your child’s blood volume.

The accuracy of the calculations may vary according to whether the averages are calculated from the population that is similar in growth patterns and body size to your child.

The Role of Blood in Your Body

Blood carries out lots of critical functioning to your body. It also delivers nutrients as well as oxygen to the cells of the body. It is also responsible for taking away waste from the cells. Blood also removes chemicals and hormones from the body. You might as well be surprised that your blood plays a very special role in regulating the body temperature.

When the body heats up, the blood helps keep the temperature steady by transporting extra heat to the skin, where it can be freed from the body. As part of your body’s immune system, the blood also helps fight disease. If you accidentally scrape your hands, the platelets in the blood begin to clot, helping the bleeding to stop. This self-repair function and role of the blood in your body prevents further loss of blood, which could be deadly in cases of massive bleeding. Blood also carries the following to the tissues of the body:

  • Electrolytes
  • Nourishment
  • Hormones
  • Vitamins
  • Antibodies
  • Heat
  • Oxygen
  • Waste matter
  • Carbon dioxide
  • Immune cells

Blood transport gases, waste, cells, nutrients, and hormones throughout the body. It also regulates temperature, pH, the content water of the cells as well as protects against the blood loss in clotting. The blood is also the one responsible for protecting the body against disease through antibodies and phagocytic white blood cells.

The Importance of a Healthy Blood Circulation

Your blood circulation is a part of your body’s various functions. Therefore, it is very crucial for your health to make sure that your blood circulation is as good as it can be.

The heart is the one responsible for pumping blood through the blood vessels all throughout the entire body. It also transports the red blood cells to perform their tasks like transferring oxygen to the body organs which provides us with the energy to carry out daily tasks.

Healthy blood circulation can benefit your heart and other muscles of the body as well as the arteries. Better blood circulation means more that there is more oxygen in the body, which means that you feel energetic and could be more productive. It also means that you can have more energy to work, which also helps increase and improve your blood circulation.

Here are main benefits of having a good blood circulation:

  • Your skin will be benefited from good blood circulation. Healthy skin is more capable of preventing bacteria and fighting off bacteria.
  • Blood circulation and flow increase areas of your body which promote organ function and growth.
  • When your heart is working at its best, your heart muscles relax, heart rate also lowers, and your blood pressure flows smoothly and evenly.

Losing Blood

Around 7 to 8 percent of human’s body weight our blood. The body can easily replace a small amount of blood loss, which makes blood donation possible. However, losing around one-fifth of the total blood inside the body can cause a serious condition that can be life-threatening. The standard amount of blood you can donate is 1 pint. It is one-tenth of the blood in your body, and it is a safe amount of blood to lose.

Experts advise that a person needs to wait for eight weeks in between blood donations. Severe bleeding can be dangerous, and when a certain individual loses nearly one-fifth of the blood volume, it can cause shock. In the medical terms, this shock means there is no enough oxygen getting to tissues inside your body. Low oxygen in the body means there is a big risk of damage to the brain and other body organs.

To keep your blood under your control, you need to live a healthy lifestyle and do self-control by eating more fresh veggies and fruits, have a regular medical check-up, eating lower fat foods, go easy on alcohol and take regular exercise.

Read: How many platelets are in a drop of blood

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