Blood Volume Estimator
Estimate your total blood volume based on height, weight, and sex using the Nadler equation.
Estimated Blood Volume
Blood volume is the total amount of blood circulating in your body. Knowing your approximate blood volume is useful in medical settings for surgery planning, blood donation assessment, and understanding fluid balance.
Nadler’s Equation:
For males:
BV = 0.3669 × H³ + 0.03219 × W + 0.6041
For females:
BV = 0.3561 × H³ + 0.03308 × W + 0.1833
Where:
- BV = blood volume in liters
- H = height in meters
- W = weight in kilograms
What each variable means:
- Height — affects blood volume because taller people have more vascular tissue
- Weight — heavier individuals generally have more blood
- Sex — males typically have about 7% of body weight as blood, females about 6.5%
When to use this calculator:
- Pre-surgical planning to anticipate blood loss tolerance
- Understanding blood donation limits
- Medical education and clinical assessments
- Fitness and health awareness
Practical example: A male who is 5'10" (178 cm) and weighs 176 lb (80 kg) would have approximately 5.3 liters of blood. A female of the same size would have approximately 4.4 liters.
Reference values:
| Person | Typical Blood Volume |
|---|---|
| Adult male (average) | 4.7–5.5 L (1.2–1.5 gal) |
| Adult female (average) | 3.5–4.5 L (0.9–1.2 gal) |
| Newborn | 0.2–0.3 L |
| Child (6 years) | 1.5–2.0 L |
Tips:
- Blood volume increases during pregnancy by 30–50%.
- Athletes may have higher blood volumes due to training adaptations.
- Dehydration can reduce effective blood volume significantly.
- This is an estimate — actual blood volume varies with fitness, health status, and hydration.