Health

Blood Volume Calculator

Estimate your total blood volume using the Nadler formula. Enter your sex, height, and weight to get your blood volume in both liters and milliliters instantly.

Blood Volume Calculator

Sex

Height (cm)

Weight (kg)

Method

How this calculator works

Nadler formula with height h in meters (h = cm / 100): Male BV(L) = 0.3669 × h³ + 0.03219 × weight + 0.6041; Female BV(L) = 0.3561 × h³ + 0.03308 × weight + 0.1833.

Select your biological sex, since the formula uses different coefficients for males and females.
Enter your height in centimeters (the calculator converts it to meters internally).
Enter your weight in kilograms.
The tool applies the Nadler formula and returns your estimated blood volume in liters and milliliters.

Disclaimer: This calculator provides estimates for informational and educational purposes only. It is not a substitute for professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider for decisions affecting your health. Results depend on the accuracy of inputs provided.

FAQ

Frequently asked questions

What is the Nadler formula?

The Nadler formula estimates total blood volume from a person's height and weight, with separate equations for males and females. It is widely used in clinical settings for transfusion and apheresis planning.

How much blood does the average adult have?

A typical adult has roughly 4.5 to 5.5 liters of blood, which is about 7 to 8 percent of body weight. The exact amount depends on sex, height, and body composition.

Why do men and women have different formulas?

On average, men have a higher proportion of lean body mass and a greater blood volume per kilogram than women, so the Nadler formula uses different coefficients for each sex to improve accuracy.

Is the estimated blood volume exact?

No. The Nadler formula gives a close estimate based on population averages. Individual blood volume can vary with fitness, hydration, altitude, pregnancy, and medical conditions.

What is blood volume used for clinically?

Blood volume estimates guide decisions in surgery, blood donation, plasma exchange, and calculating safe blood loss limits or transfusion needs during procedures.