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Blood Volume Calculator

Health

Estimate total blood volume from height, weight, and sex using Nadler's formula. A standard reference calculation, not a clinical transfusion planning tool.

Written by · Reviewed by the thecalcu.com team · Last updated July 27, 2026

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Estimated Total Blood Volume

4.25

This calculator computes your Estimated Total Blood Volume from the values you enter.

Inputs
HeightWeightSex
Outputs
Estimated Total Blood Volume

Medical disclaimer: This calculator is for general information and educational use only. It is not a diagnosis and not a substitute for professional medical advice. Always consult a qualified healthcare provider about your health and before acting on any result.

What is a Blood Volume?

The Blood Volume Calculator estimates total blood volume from height, weight, and sex using Nadler's formula, a widely referenced equation in blood volume estimation literature. This is an educational reference tool, not a clinical transfusion planning tool.

For a related calculation, see the Plasma Volume Calculator.

Why Use a Blood Volume Calculator?

Total blood volume varies significantly between individuals based on body size, and Nadler's formula gives a more personalized estimate than relying on a single population average. This calculator applies that formula instantly.

Who Should Use This Calculator?

  • Students of physiology or nursing learning how blood volume is estimated from body measurements.
  • Healthcare educators demonstrating Nadler's formula.
  • Researchers working with blood volume reference calculations.
  • Anyone curious about how height and weight relate to estimated blood volume.

What Insights Does the Blood Volume Calculator Give You?

The Estimated Total Blood Volume in litres is the sole output, calculated from your entered height, weight, and sex using Nadler's formula, a standard reference estimate, not a direct measurement.

How to use this Blood Volume calculator

  1. Enter your height in centimetres.
  2. Enter your weight in kilograms.
  3. Select your sex.
  4. Read the Estimated Total Blood Volume instantly.
Show formula & methodology ↓Hide formula & methodology ↑

Formula & Methodology

Male: Blood Volume (L) = 0.3669 × Height (m)³ + 0.03219 × Weight (kg) + 0.6041

Female: Blood Volume (L) = 0.3561 × Height (m)³ + 0.03308 × Weight (kg) + 0.1833

Worked example, a man 178 cm (1.78 m) tall, weighing 80 kg:

Blood Volume = 0.3669 × (1.78)³ + 0.03219 × 80 + 0.6041 = 0.3669 × 5.64 + 2.575 + 0.6041 ≈ 5.25 L

Frequently Asked Questions

What is Nadler's formula?

Nadler's formula is a widely referenced equation for estimating total blood volume from height, weight, and sex, using separate coefficients for men and women that account for typical differences in body composition.

How is total blood volume calculated?

For men, the formula is 0.3669 × height(m)³ + 0.03219 × weight(kg) + 0.6041; for women, it's 0.3561 × height(m)³ + 0.03308 × weight(kg) + 0.1833, giving the result in litres.

Why does the formula use height cubed?

Blood volume correlates with overall body size, and using height cubed (which scales similarly to body volume) alongside weight gives a more accurate estimate than either measurement alone.

Is this calculator used for clinical transfusion planning?

No, this is an educational reference calculator only. Actual transfusion and fluid management planning must be determined by a qualified healthcare professional based on the complete clinical picture.

Why do men and women have different formula coefficients?

The separate coefficients reflect average physiological differences in body composition between sexes, which affect the relationship between height, weight, and total blood volume.

What is a typical blood volume for an adult?

Adult blood volume is commonly cited as roughly 5 litres on average, though it varies significantly by individual body size, which is exactly why a height-and-weight-based formula gives a more personalized estimate than a single average figure.

How does this relate to the Plasma Volume Calculator?

The [Plasma Volume Calculator](/plasma-volume-calculator/) builds directly on this blood volume estimate, further adjusting for hematocrit to estimate the non-cellular liquid portion of blood.

Can this calculator be used for children?

Nadler's formula was developed and validated for adults; blood volume estimation in children typically uses different pediatric-specific reference formulas.

What unit does this calculator use for the result?

This calculator expresses total blood volume in litres (L), the standard unit used in blood volume reference literature.

How accurate is Nadler's formula?

Nadler's formula is a widely cited reference estimate; individual blood volume can vary from the formula's prediction due to factors like body composition, pregnancy, or certain health conditions.
Also known as
Nadler formula calculatortotal blood volume calculatorblood volume estimateTBV calculator