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RBC Transfusion Units Needed Calculator

Units of packed RBCs to raise hemoglobin to target.

Estimate the number of packed RBC units needed to raise hemoglobin from current to target, using the standard rule of thumb that one adult unit raises Hb by 1 g/dL in a 70 kg patient (scaled by weight).

Priya Venkatesan By Priya Venkatesan
Published Last reviewed 1 min read

Inputs

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

Units ≈ (Hb_target − Hb_current) · weight_kg / 70.

In depth

Estimate the number of packed RBC units needed to raise hemoglobin from current to target, using the standard rule of thumb that one adult unit raises Hb by 1 g/dL in a 70 kg patient (scaled by weight).