The liver processes alcohol at a fairly steady, limited rate: on average, it clears the equivalent of about one standard drink per hour , or a drop in blood alcohol concentration (BAC) of roughly 0.015% per hour in many adults.

Typical processing rate per hour

  • Many health and university sources describe a rule of thumb: the liver metabolizes about one standard drink per hour , though this can vary from person to person.
  • In BAC terms, that is often expressed as the body reducing alcohol at around 0.015% BAC per hour , once peak alcohol level is reached.
  • Some guides also translate this to roughly 10–12 grams of pure alcohol per hour for a healthy adult liver.

Why the rate is (mostly) fixed

  • The liver uses enzymes (especially alcohol dehydrogenase) that work at a near‑constant capacity, so drinking coffee, taking a cold shower, or exercising does not meaningfully speed up detox.
  • What does change a lot between people is how high the BAC goes from a given drink (affected by body size, sex, genetics, food, medications, and liver health), but once alcohol is absorbed, the elimination rate stays relatively stable for that person.

Factors that slow or change this rate

  • Liver disease, long‑term heavy drinking, some medications, and age can reduce how efficiently the liver breaks down alcohol, so it may take longer than one drink per hour to clear.
  • Women, smaller individuals, and those with certain genetic enzyme variants often reach higher BACs from the same amount of alcohol, so even at the same metabolic rate, it takes longer to return to zero.

Practical safety takeaway

  • Because the liver’s capacity cannot be “forced” to go faster, spacing drinks out, having alcohol‑free days, and planning safe transport are key harm‑reduction strategies.
  • If someone appears very intoxicated, confused, vomiting repeatedly, breathing slowly, or hard to wake, that can signal alcohol poisoning and is a medical emergency regardless of how many hours have passed.

Bottom line: for many adults, the liver processes about one standard drink per hour (around 0.015% BAC per hour or about 10–12 g of alcohol) but individual variation and health status can make the true rate slower.