Recommended Cuff Sizes for Accurate Measurement of Blood Pressure

PATIENT	RECOMMENDED CUFF SIZE
Adults (by arm circumference)
22 to 26 cm	12 × 22 cm (small adult)
27 to 34 cm	16 × 30 cm (adult)
35 to 44 cm	16 × 36 cm (large adult)
45 to 52 cm	16 × 42 cm (adult thigh)

(For ease of use, adult cuffs for BP monitoring can be divided into 4 sizes - Small, Medium, Large and Thigh cuffs)

Objective of above pearl is to emphasis that ideally arm cuff can't be applied to thigh, often a common practice.

Reference:

Pickering TG, Hall JE, Appel LJ, Falkner BE, Graves J, Hill MN, et al.; Subcommittee of Professional and Public Education of the American Heart Association Council on High Blood Pressure Research. Recommendations for blood pressure measurement in humans and experimental animals. Part 1: blood pressure measurement in humans. Hypertension 2005;45:142–61