◑ HEALTH Updated July 25, 2026

Blood Alcohol (BAC) Calculator

A rough BAC estimate — never a licence to drive.

Body weight (kg)
Sex
Standard drinks
Hours since first drink
Result

An estimate only. Never use this to decide whether to drive.

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How it works

The Widmark formula divides the grams of alcohol consumed by body water volume, then subtracts roughly 0.015% per hour for metabolism. One standard drink is treated as 14 g of pure alcohol.

Related tools

◕BMR Calculator◈Calorie Calculator▣Body Fat Calculator

Frequently asked questions

How accurate is this?

It is an estimate. Food, medication, sex, genetics and drink strength all shift real BAC substantially.

How long until I am sober?

Alcohol clears at roughly 0.015% per hour and nothing speeds it up — not coffee, food or a cold shower.

Comments

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