// multi-utility computation suite · offline · instant · precise
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health.ankle-brachial-index Calculator
Calculates the Ankle-Brachial Index (ABI) from ankle and brachial systolic pressures and classifies peripheral artery disease severity. ABI below 0.9 indicates PAD; below 0.4 is critical ischaemia — the test is 95% sensitive for angiographically confirmed PAD.
Inputs
Ankle Systolic
The top blood pressure number — pressure during a heartbeat. Normal: below 120 mmHg. Stage 1 hypertension: 130–139.
Brachial Systolic
The top blood pressure number — pressure during a heartbeat. Normal: below 120 mmHg. Stage 1 hypertension: 130–139.
Contralateral Brachial
Reference formula or conversion factor shown for context.
Results
ABI
Reference formula or conversion factor shown for context.
interpretation
Qualitative summary of what the computed numbers mean in practical terms.
ankle pressure
Sample size or count used in the calculation.
brachial pressure
Reference formula or conversion factor shown for context.
ABI = ankle BP / brachial BP
Sample size or count used in the calculation.
normal range
The difference between the maximum and minimum values.