This version was machine-translated from German and has not been medically reviewed. The authoritative version is the German version.
Blood volume by age
Estimated circulating blood volume (ml/kg by age group) and maximum tolerable blood loss
Calculation aid for healthcare professionals: the calculator reproduces what the sources cited assign to the inputs. Clinical assessment and every treatment decision remain with the treating physician. Inputs and results are not stored.
Frequently asked questions
Blood volume by age: What does this calculator compute?
Estimates circulating blood volume from body weight and age group (preterm infants 90–100, newborns 80–90, infants 75–80, children 70–75, adolescents 70, adults 65–75 ml/kg) and optionally calculates the maximum tolerable blood loss down to a minimum hematocrit.
Blood volume by age: Which sources is this calculator based on?
Riley AA, Arakawa Y, Worley S, Duncan BW, Fukamachi K: Circulating blood volumes: a review of measurement techniques and a meta-analysis in children (ASAIO J 56:260–264) (2010); OpenAnesthesia (IARS): Maximum Allowable Blood Loss – Table 1: Blood Volume by Age (2024)