Toe-Brachial Index (TBI)
Toe-brachial index (Aboyans 2012): toe systolic / higher brachial systolic pressure; < 0.70 supports peripheral arterial disease.
Open the calculator → Runs in your browser. Data leaves only if you deliberately send a problem report from the interactive tool.
Example
- Toe systolic pressure
- 50 mmHg
- Brachial systolic pressure
- 120 mmHg
Result: TBI 0.42 — below 0.70: abnormal, supports peripheral arterial disease.
The tool opens with these values already filled in. Replace them with your own.
What the result means
- Threshold
- A TBI below 0.70 is abnormal (PAD); the test of choice when the ABI is non-compressible (> 1.40).
What you enter
- Toe systolic pressure
- Brachial systolic pressure
How this is calculated
- Formula
- TBI = toe systolic / higher brachial systolic pressure.
Aboyans V, Criqui MH, Abraham P, et al. Measurement and interpretation of the ankle-brachial index. Circulation. 2012;126(24):2890-2909. Read the source ↗
A reference and educational tool. Not medical, legal, or financial advice, and not a substitute for clinician judgment.