Calculate ABI as the ratio of ankle systolic pressure to brachial systolic pressure.
| ABI | – |
Use this calculator after you have already chosen the highest ankle and highest arm systolic pressures from the cuffs. ABI is ankle systolic ÷ brachial systolic. Typical adult sketches treat about 0.9–1.4 as the usual range; lower values raise concern for PAD, and very high values can reflect calcified vessels rather than healthy flow.
Pressures stay in mmHg. This is a ratio, not a diagnosis and not a full vascular study.
Ankle systolic: Highest ankle systolic pressure, in mmHg.
Brachial systolic: Highest arm systolic pressure, in mmHg.
ABI: Ankle-brachial index (dimensionless).
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