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Maximum Allowable Blood Loss from EBV and Hemoglobin Calculator

MABL = EBV · (Hb_i − Hb_t) / Hb_avg.

Compute the maximum allowable blood loss (MABL) before transfusion is needed in surgery: MABL = EBV · (Hb_initial − Hb_target) / Hb_average, where Hb_average = (Hb_initial + Hb_target)/2 and EBV is the estimated blood volume (≈ 70 mL/kg adult male, 65 mL/kg adult female, 80 mL/kg child).

Priya Venkatesan By Priya Venkatesan
Published Last reviewed 1 min read

Inputs

kg
mL/kg
g/dL
g/dL

Results

Enter values and click Calculate to see results.
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How to use this calculator

  1. Fill in the inputs above using the units you already have.
  2. Values update automatically as you type — no submit button needed.
  3. Hover any result row for the underlying formula and intermediate values.

Formula

MABL = EBV·(Hb_i − Hb_t) / ((Hb_i + Hb_t)/2).

In depth

Compute the maximum allowable blood loss (MABL) before transfusion is needed in surgery: MABL = EBV · (Hb_initial − Hb_target) / Hb_average, where Hb_average = (Hb_initial + Hb_target)/2 and EBV is the estimated blood volume (≈ 70 mL/kg adult male, 65 mL/kg adult female, 80 mL/kg child).