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Warfarin INR Dose Adjustment Calculator

Weekly dose adjustment by INR vs target (2–3).

Estimates warfarin weekly dose adjustment based on current INR versus therapeutic target range, using standard clinical guidelines.

Nadia Almasri By Nadia Almasri
Published Last reviewed 1 min read

Inputs

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

Adjustment% based on INR deviation from target; new_dose = old × factor

In depth

Estimates warfarin weekly dose adjustment based on current INR versus therapeutic target range, using standard clinical guidelines.