Calculated Blood Loss (cEBL) Calculator -BETA

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This calculator may be used estimate  blood loss during delivery.

Enter patient's height and weight. Enter patient's hematocrit before (predelivery hematocrit)  and hematocrit after (postdelivery hematocrit , then press 'Calculate'.

Maternal height

Maternal Weight

Predelivery hematocrit    %     Postdelivery hematocrit  %



  • Calculated pregnancy blood volume = (0.75 ([maternal height (inches) X 50]+ [maternal weight in pounds X 25])
  • Percent of blood volume lost = (Predelivery HCT- postdelivery HCT) / predelivery HCT.
  • Calculated estimated blood loss (cEBL) = Calculated pregnancy blood volume X  Percent of blood volume lost


1. Stafford I, Dildy GA, Clark SL, Belfort MA. Visually estimated and calculated blood loss in vaginal and cesarean delivery. Am J Obstet Gynecol 2008;199(5):519.e1519.e7 PMID: 18639209
2. Gutierrez G, Reines HD, Wulf-Gutierrez ME.Clinical review: hemorrhagic shock. Crit Care. 2004 Oct;8(5):373-81. Epub 2004 Apr 2.PMID: 15469601
3. Martel MJ,et. al., Clinical Practice Obstetrics Committee and Executive and Council, Society of Obstetricians and Gynaecologists of Canada. Hemorrhagic shock.J Obstet Gynaecol Can. 2002 Jun;24(6):504-20; quiz 521-4.PMID: 12196857
4. Lyndon A, Lagrew D, Shields L, Main E, Cape V. Improving Health Care Response to Obstetric Hemorrhage. (California Maternal Quality Care Collaborative Toolkit to Transform Maternity Care) Developed under contract #11-10006 with the California Department of Public Health; Maternal, Child and Adolescent Health Division; Published by the California Maternal Quality Care Collaborative, 3/17/15

All calculations must be confirmed before use. The suggested results are not a substitute for clinical judgment. Neither nor any other party involved in the preparation or publication of this site shall be liable for any special, consequential, or exemplary

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