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INR Target Range Calculator

Work out inr target range instantly with clear inputs, formula shown and shareable results.

About INR Target Range Calculator

Reports the conventional INR target range for the chosen indication and shows how far the current value sits from the midpoint.

Formula

Common target ranges

Atrial fibrillation and venous thromboembolism 2.0-3.0; mechanical mitral valve 2.5-3.5; mechanical aortic valve commonly 2.0-3.0

Worked example

With the default values below, INR Target Range Calculator returns Target INR range of 2.0 to 3.0. Change any input above and every figure here is recalculated in your browser.

Inputs used

Indicationone of Atrial fibrillation, Venous thromboembolism, Mechanical mitral valve, Mechanical aortic valve
Atrial fibrillation
Current INRaccepts 0.8–10
2.8

Results

Target INR range
2.0 to 3.0
Current status
Within target range
Distance from the midpoint
0.30
Target midpoint
2.50

Step by step

  1. 1Values used
  2. 2Common target ranges
  3. 3Target INR range= 2.0 to 3.0
  4. 4Current status= Within target range
  5. 5Distance from the midpoint= 0.30
  6. 6Target midpoint= 2.50

Assumptions and limits

  • The result is derived only from the 2 inputs listed above. Anything not among them is not part of the calculation.
  • In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
  • Figures are rounded for display to 2 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.
  • Educational estimate only. Not a substitute for professional clinical judgement, and must not be used to make treatment or dosing decisions.
  • This is an estimate for general information and not professional medical advice. See the full disclaimer for the limits that apply to this kind of calculator.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Educational estimate only. Not a substitute for professional clinical judgement, and must not be used to make treatment or dosing decisions.

Frequently Asked Questions

Do targets vary between countries?

Yes. Valve targets in particular differ between ACC/AHA and ESC guidance and by valve model.

What is the time in therapeutic range?

The share of days the INR sits inside the target band; above 65 to 70% is the usual quality goal.

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