Capitalization - AMA Manual of Style

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Units of Measure

Phil B. Fontanarosa

and Stacy Christiansen

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PRINTED FROM AMA MANUAL OF STYLE ONLINE ( © American Medical Association, 2009. All Rights Reserved. Under the terms of the license agreement, an individual user may print out a PDF of a single chapter of a title in AMA Manual of Style Online for personal use (for details see Privacy Policy). date: 26 November 2015

The SI unit names are written lowercase (eg, kilogram) when spelled out, except for Celsius (as in “degrees Celsius”), which is capitalized. Abbreviations or symbols for SI units also are written lowercase, with the following exceptions: ▪ Abbreviations derived from a proper name should be capitalized (eg, N for newton, K for kelvin, A for ampere), although nonabbreviated SI unit names derived from a proper name are not capitalized (eg, newtons, amperes). ▪ An uppercase letter L is used as the abbreviation for liter to avoid confusion with the lowercase letter l and the number 1. ▪ Certain SI prefixes

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