Estimate blood alcohol content (BAC) using the Widmark formula based on drinks consumed, body weight, sex, and hours since drinking started.
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Sex
Drinks consumed
0.009%
BAC
0.6h
Until sober
14g
Alcohol consumed
| Blood alcohol content | 0.009% |
| Effect | Minimal effect |
| Hours until sober | 0.6 hours (est. 9:44 PM) |
| Total alcohol consumed | 14 g ethanol |
Also in Alcohol
Health & Wellness
This calculator estimates blood alcohol content (BAC) using the Widmark formula. Enter your sex, weight, drinks consumed, and hours since you started drinking to see an estimated BAC and how long until you are sober.
BAC (%) = [alcohol in grams ÷ (body weight in kg × gender constant × 10)] − (0.015 × hours elapsed). The gender constant is 0.73 for men and 0.66 for women, reflecting differences in body water content. Alcohol is metabolised at approximately 0.015% BAC per hour on average.
Women generally have a lower ratio of body water to body mass than men of the same weight. Since alcohol distributes into body water, the same number of drinks results in a higher BAC for women. Age, body composition, and liver health also influence alcohol metabolism.
At 0.02–0.05%, most people feel mild relaxation. At 0.05–0.08%, reaction time and coordination are measurably impaired. The legal driving limit in the US is 0.08%; in most of Europe it is 0.05%. At 0.15–0.20% and above, severe impairment and risk of blackout occur.
The liver metabolises approximately 0.015% BAC per hour. This rate is relatively fixed and cannot be meaningfully accelerated by coffee, food, water, or exercise. Time is the only reliable way to lower BAC.
Frequently asked questions
Never use a BAC calculator to decide whether to drive. Impairment begins well below the legal limit and varies by individual. If you have been drinking, do not drive — use a rideshare service or designated driver.
The Widmark formula gives a rough estimate. Actual BAC is affected by food in the stomach, drink carbonation, hydration, individual metabolic rate, and medications. Actual BAC can differ significantly from the estimate.
In the US, one standard drink contains 14 g of pure alcohol: 355 ml (12 oz) of regular beer at 5%, 148 ml (5 oz) of wine at 12%, or 44 ml (1.5 oz) of spirits at 40%.
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