Estimated blood volume + max allowable blood loss
Estimated blood volume (weight*EBV factor) and maximum allowable blood loss from starting and minimum acceptable hematocrit.
Open the calculator → Runs in your browser. Data leaves only if you deliberately send a problem report from the interactive tool.
Example
- Weight
- 70 kg
- Patient type
- Child / adult male (75)
- Starting hematocrit
- 45 %
- Minimum acceptable hematocrit
- 30 %
Result: Estimated blood volume 5250 mL; maximum allowable blood loss 1750 mL.
The tool opens with these values already filled in. Replace them with your own.
What you enter
- Weight
- Patient type (EBV factor, mL/kg)
- Starting hematocrit
- Minimum acceptable hematocrit
How this is calculated
Gross JB. Estimating allowable blood loss: corrected for dilution. Anesthesiology. 1983;58(3):277-280. MABL = EBV x (start Hct - min Hct) / start Hct; the paper takes the estimated blood volume as an input and publishes no per-kilogram table, so the factor is the reader's to choose. Read the source ↗
A reference and educational tool. Not medical, legal, or financial advice, and not a substitute for clinician judgment.