basic

Estimated Blood Loss from Hemoglobin Drop Calculator

EBL ≈ EBV · (Hb_initial − Hb_final) / Hb_avg.

Estimate operative or post-operative blood loss in mL from the change in haemoglobin and the patient's estimated blood volume (EBV ≈ 70 mL/kg adult, 80 mL/kg child): EBL ≈ EBV · (Hb_initial − Hb_final) / ((Hb_initial + Hb_final)/2). Useful for transfusion-volume estimation.

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

EBL ≈ EBV · (Hb_i − Hb_f) / Hb_avg.

In depth

Estimate operative or post-operative blood loss in mL from the change in haemoglobin and the patient's estimated blood volume (EBV ≈ 70 mL/kg adult, 80 mL/kg child): EBL ≈ EBV · (Hb_initial − Hb_final) / ((Hb_initial + Hb_final)/2). Useful for transfusion-volume estimation.