Background: All scoring systems used in Alopecia Areata (AA) focus mainly on scalp and cannot assess the severity or treatment response when AA involves the beard hair, eyebrows, or eyelashes. Aim: This study describes and assesses the reliability of a new scoring system "Alopecia Areata Severity Index" (AASI) for measuring the severity of AA of scalp, beard, and upper face. Methods: Scalp hair, beard hair, upper face (eyebrows and eyelashes) were individually assessed and the severity of AA was scored from 0 to 100 (0–50 in case of upper face). AASI score was then calculated as a sum of all these individual scores as AASI = AASI (scalp) + AASI (upper face) + AASI (beard)+. To test the inter‐observer reliability of AASI score, 25 patients with varying severity of AA were scored by 4 trained dermatologists. Repeat scoring was performed after one week to test for intra‐observer reliability. Results: Excellent inter‐rater, as well as intra‐observer reliability, was observed with Chronbach's alpha value of 0.999 (CI = 0.989–1.000). The intra‐observer correlation coefficient with average measure was 0.999 (CI = 0.990–1.000) with statistically significant F test <0.005. Conclusion: AASI score is a reliable scoring system to assess the severity of AA in patients with involvement of one or more areas of the body. Limitations: Sample population belonged to single ethnic group. [ABSTRACT FROM AUTHOR]