Blood Volume Calculator
Nadler's Equation
Estimate total blood volume using Nadler's formula
cm
kg
Quick Estimate (mL/kg)
Quick blood volume estimate using weight-based approximation
kg
Formula
Nadler's Equation: Males: BV(L) = 0.3669 × H(m)^3 + 0.03219 × W(kg) + 0.6041 | Females: BV(L) = 0.3561 × H(m)^3 + 0.03308 × W(kg) + 0.1833 | Quick estimate: BV(mL) = Weight(kg) × mL/kg factor
Frequently Asked Questions
How much blood is in the human body?
The average adult has about 4.7-5.5 liters (1.2-1.5 gallons) of blood. This is roughly 7% of body weight. Males average ~70 mL/kg and females ~65 mL/kg.
What is Nadler's equation?
Nadler's equation (1962) estimates total blood volume using height and weight: Males: BV(L) = 0.3669 x H(m)^3 + 0.03219 x W(kg) + 0.6041. Females: BV(L) = 0.3561 x H(m)^3 + 0.03308 x W(kg) + 0.1833.
How much blood can you safely lose?
Class I hemorrhage (up to 15%, ~750 mL in adults) typically requires no transfusion. Class II (15-30%) may need fluids. Class III (30-40%) and Class IV (>40%) are life-threatening and typically require blood transfusion.
Why does blood volume matter in medicine?
Blood volume estimation is critical in surgery, trauma management, blood transfusion planning, fluid resuscitation, and pharmacokinetic calculations for drugs distributed in blood.
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