Hamilton–Norwood scale

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Part of the Hamilton-Norwood classification system.

The progression of male pattern baldness is generally classified on the Hamilton–Norwood scale, which ranges from stages I to VII.[1]

This measurement scale was first introduced by James Hamilton in the 1950s and later revised and updated by O'Tar Norwood in the 1970s.[2] It is sometimes referred to as the Norwood–Hamilton scale or simply the Norwood scale.

See also[edit]


  1. ^ Guarrera M, Cardo P, Arrigo P, Rebora A (2009). "Reliability of hamilton-norwood classification". Int J Trichology. 1 (2): 120–2. doi:10.4103/0974-7753.58554. PMC 2938573. PMID 20927233.
  2. ^ Gupta, M; Mysore, V (2016). "Classifications of Patterned Hair Loss: A Review". Journal of Cutaneous and Aesthetic Surgery. 9 (1): 3–12. doi:10.4103/0974-2077.178536. PMC 4812885. PMID 27081243.