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Blood Volume Calculator

Estimate the approximate volume of blood in the body from body weight and category (adult male, adult female, child). See the liters and milliliters, the coefficient per kilogram, and how much of your body weight is blood (about 1/13).

Input

Estimate the approximate volume of blood in the body from body weight and category. Actual blood volume varies between individuals depending on body build and composition.

Category

kg

Result

Estimated blood volume (Adult male)

4.5L

About 4,500 mL

Category

Adult male

Coefficient per kg

75 mL/kg

Share of body weight

About 1/13 (7.9%)

Estimated coefficient by category (blood per 1 kg of body weight)

CategoryCoefficient
Adult male (selected)75 mL/kg
Adult female65 mL/kg
Child / infant80 mL/kg

How it works

  • Estimates the approximate volume of blood in the body from body weight and category (adult male, adult female, child).
  • The formulas used are adult male = weight (kg) x 75 mL, adult female = weight (kg) x 65 mL, and child = weight (kg) x 80 mL.
  • Blood volume in the body is roughly 1/13 of body weight (about 7-8%) and can be approximated with a coefficient per kilogram.
  • The share of body weight that is blood and the conversion to liters are also shown.
  • Actual blood volume varies between individuals depending on build, body-fat percentage, and age; the values here are standard estimates.
  • This tool provides estimates from general formulas and is not a diagnosis or medical advice. Always consult a doctor for health decisions.