Blood alcohol content
metric of alcohol intoxication
Blood alcohol content (BAC), also known as blood alcohol concentration or blood alcohol level, is the concentration of alcohol in a person's blood, measured for legal or medical purposes.
BAC is expressed as the mass of alcohol per unit volume of blood. In the United States and many other countries, it is commonly reported as a percentage, such as 0.08% (equivalent to 0.8 g/L). Legal limits for driving vary by country, ranging from zero tolerance policies to 0.08%. Levels above 0.40% (4 g/L) may be fatal.
Units of measurement
BAC is the mass of alcohol per unit volume of blood. The SI unit is kilogram per cubic metre (kg/m3), though it is commonly reported as grams per liter (g/L). Reporting conventions vary by country.
In the United States and several other countries, BAC is expressed as a percentage, such as 0.05%. This corresponds to 0.05 grams per deciliter of blood.
Begin with the source’s own compact description: “Blood alcohol content” is metric of alcohol intoxication. The dossier treats that line as a proposition to test through Blood, alcohol and content, not as a finished interpretation.
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Vocabulary and entity names are the principal evidence signals here, because they determine the precision of every later search. The source revision retrieved here is dated Aug 31, 2026. The linked authority identifier is Q886470. The Library of Congress control number is sh85014959. None of the 1 selected statements returned an explicit reference.
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This entry incorporates text from “Blood alcohol content” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.