🩺 ABI Calculator — Ankle-Brachial Index Calculator

The Ankle-Brachial Index (ABI) is a simple, non-invasive test used to check for peripheral arterial disease (PAD). Enter the systolic blood pressure (SBP) values measured at the ankle and brachial (arm) arteries to calculate the ABI and assess arterial health.

Ankle Systolic Blood Pressure (mmHg)

Brachial (Arm) Systolic Blood Pressure (mmHg)

* The higher of the two brachial values is used as the denominator per standard ABI protocol.

🩺 ABI Calculator

The Ankle-Brachial Index (ABI) Calculator is a clinical tool used by healthcare professionals to screen for peripheral arterial disease (PAD). It compares the blood pressure at the ankle with the blood pressure in the upper arm to gauge how well blood is flowing to your legs.

💡 Why ABI Matters

PAD affects millions of people and significantly increases the risk of heart attack and stroke. The ABI test is the gold-standard non-invasive screening tool — a simple ratio that reveals whether arterial narrowing is limiting blood flow to the extremities. Early detection allows timely lifestyle intervention and medical management.

📊 How ABI Is Calculated

The ABI is calculated by dividing the highest ankle systolic blood pressure by the highest brachial (arm) systolic blood pressure:

ABI = Ankle SBP ÷ Highest Brachial SBP

For bilateral assessment, each leg's ankle pressure is divided by the higher of the two arm pressures, yielding a left and right ABI independently.

🚀 How to Use This Calculator

  1. 1.Select Bilateral or Single Leg mode.
  2. 2.Measure systolic blood pressure at each ankle using a Doppler probe.
  3. 3.Measure systolic blood pressure in both arms.
  4. 4.Enter all values (in mmHg) into the corresponding fields.
  5. 5.Click Calculate ABI to see results, gauge visualization, and clinical interpretation.

⚕️ Clinical Disclaimer

This calculator is intended as an educational and clinical decision support tool only. ABI results should always be interpreted in the context of a full clinical assessment by a qualified healthcare provider. Do not use this tool as a substitute for professional medical advice, diagnosis, or treatment.