Pediatric Blood Volume Calculator

Your details

Current body weight of the child. Use kilograms in metric mode or pounds in imperial.
kg
Select the age group that best fits the child. Each group has a different standard blood volume per kilogram of body weight.
Total blood volumeModerate blood volume
1,125mL

Estimated total circulating blood volume

Total blood volume1.13L
Blood volume per kg75mL/kg
Max single draw28.1mL
Max draw per 24 h56.3mL
Max draw per 8 weeks112.5mL
Total blood volume1,125
Max 8-week draw112.5
Max 24-hour draw56.3
Max single draw28.1

Estimated total blood volume: 1125 mL (1.13 L)

  • A child (1-12 years) carries approximately 75 mL of blood per kilogram of body weight.
  • A single blood draw should not exceed 28.1 mL (2.5% of total blood volume).
  • Over any 24-hour window, the cumulative draw limit is 56.3 mL (5% of TBV).
  • Over any 8-week period, cumulative draws should stay under 112.5 mL (10% of TBV).

Next stepAlways follow your institution's specific protocols. These are general guideline thresholds, not a substitute for clinical judgement.

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