Blood Volume Calculator
Estimate your total blood volume with the Nadler formula. Enter your sex, height, and weight, and this calculator returns your approximate blood volume in litres and millilitres, plus the amount per kilogram of body weight.
Rates and fees change frequently. Always confirm the current figures
with the official authority before relying on this result.
- Educational estimate. Clinical use requires professional judgement.
Formula
Nadler (male): 0.3669 × h³ + 0.03219 × w + 0.6041
(female): 0.3561 × h³ + 0.03308 × w + 0.1833 (h in m, w in kg)
- The Nadler formula estimates total blood volume from height (in metres) and weight (in kg), with separate equations for men and women.
- Men: 0.3669 × h³ + 0.03219 × w + 0.6041 (litres); Women: 0.3561 × h³ + 0.03308 × w + 0.1833.
- A typical adult has roughly 5 litres of blood, about 7–8% of body weight.
- Per-kg blood volume is commonly near 70 mL/kg for men and 65 mL/kg for women.
- This is an estimate for education; clinical use needs professional measurement and judgement.
Male, 175 cm, 75 kg
Inputs
- Sex: male
- Height: 175 cm
- Weight: 75 kg
Using the male Nadler equation gives about 5.3 L (≈5300 mL), roughly 71 mL per kg of body weight.
Frequently asked questions
What is the Nadler formula?
It is a widely used equation that estimates total blood volume from a person's height, weight, and sex.
How much blood does an adult have?
Roughly 4.5–5.5 litres, about 7–8% of body weight, though it varies with body size and sex.
Why do men and women have different formulas?
Body composition differs on average, so the equations use slightly different coefficients to better reflect each.
What is blood volume used for?
It helps estimate safe blood donation amounts, transfusion needs, and medication dosing in clinical settings.
How accurate is the estimate?
It is a population-based approximation. Individual volume varies with fitness, hydration, and health, so treat it as a guide.
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Body Surface Area (BSA) Calculator Calculate your body surface area (BSA) with the Mosteller and Du Bois formulas. Enter your height and weight to get your BSA in m², widely used for drug dosing and clinical measurements. Cardiac Output Calculator Calculate cardiac output — the volume of blood your heart pumps each minute. Enter heart rate and stroke volume, and this calculator multiplies them (and converts to litres) to give cardiac output in L/min, with how it compares to the normal resting range.