How does the Blood Volume Calculator work?

Male EBV ≈ 70 mL/kg Then: Female EBV ≈ 65 mL/kg Then: 70 kg adult male → ~4.9 L blood Then: Blood is ~7–8% of body weight.

Can you give an example of how to use the Blood Volume Calculator?

Example: Input 75 kg female gives a result of EBV ≈ 75 × 65 = 4,875 mL (4.9 L).

Is the Blood Volume Calculator free to use?

Yes — completely free with no registration, download, or subscription required. All calculations happen instantly in your browser.

How accurate is the Blood Volume Calculator?

Our Blood Volume Calculator uses verified mathematical formulas and is accurate to multiple decimal places. Results are calculated in real-time using the same methods used by professionals.

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Blood Volume Calculator

Body Weight (kg)

Blood volume estimation is used clinically for transfusion planning. Simple weight-based estimate: ~70 mL/kg (men), ~65 mL/kg (women).

Symbol	Name	Unit	Description
BW	Body weight	kg	—
BV	Blood volume	mL (or liters)	—

Weight	Male (70mL/kg)	Female (65mL/kg)
50 kg	3,500 mL	3,250 mL
70 kg	4,900 mL	4,550 mL
90 kg	6,300 mL	5,850 mL

References

›Blood volume — UpToDate

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Blood Volume Calculator

Blood Volume Calculator

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Blood Volume Calculator