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Ankle-Brachial Index (ABI) Calculator

Screen for peripheral artery disease from BP measurements.

Calculates ABI = ankle systolic BP / brachial systolic BP. ABI < 0.9 indicates PAD, 0.9–1.3 is normal, > 1.3 may indicate calcification.

Priya Venkatesan By Priya Venkatesan
Published Last reviewed 1 min read

Inputs

mmHg
mmHg

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

ABI = P_ankle / P_brachial

In depth

Calculates ABI = ankle systolic BP / brachial systolic BP. ABI < 0.9 indicates PAD, 0.9–1.3 is normal, > 1.3 may indicate calcification.