Blood Volume Estimate
Calculator
Results
- Estimated blood volume
- 5.3191
Calculation details
| Height in metres | 1.8 |
| Body weight | 80 |
Formula
BV = c₁H³ + c₂W + c₀- height_m
- 1.80
- weight
- 80.00
= 5.3191
Note
This is an educational estimate, not a diagnosis or treatment recommendation.
More in Health
See all →Frequently asked questions
How is total blood volume estimated from height, weight and sex?+
This calculator uses standard formulas (such as Nadler's equation) that relate blood volume to body size and sex, since blood volume scales with lean body mass more than with fat mass. Men and women use separate equations because of differences in typical body composition.
Why does sex affect the estimate so much?+
Men generally carry a higher proportion of lean tissue and red blood cell mass relative to body size, which increases blood volume per kilogram compared to women. The separate formulas account for this average physiological difference.
Is this the same as the blood volume a lab or hospital would measure?+
No. Clinical blood volume is measured with tracer dilution techniques and can vary with hydration, altitude, and health conditions. This calculator gives a population-based estimate for reference, education, or rough clinical screening only.
Why would someone need to know their estimated blood volume?+
It's commonly referenced in contexts like transfusion planning, dialysis, exercise physiology, or estimating blood loss as a percentage of total volume during surgery or trauma. Knowing the baseline helps put a given blood loss volume into perspective.
Does obesity change how accurate this estimate is?+
Yes. Because fat tissue holds much less blood per kilogram than lean tissue, the standard formulas can overestimate volume in people with a high body fat percentage. Clinicians often use adjusted weight formulas in these cases for better accuracy.