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Enter how much you drank and its strength. The calculator converts drinks into grams of ethanol and shows a broad estimated concentration range using the Watson/Widmark model, accounting for sex, age, height, weight and elapsed time.
The drinks contain about 19.7 g pure alcohol — roughly 1.4 NIAAA standard drinks (2.5 UK units) and 138 kcal from ethanol alone.
Before elimination, the modelled maximum is 0.34–0.42 g/L. At the slow edge of the model, the near-zero estimate is about 4.5 h more; reality may take longer. This is not a guaranteed sobriety time.
It has been less than two hours since the last drink: absorption may still be continuing, so the current range is especially uncertain and concentration may still rise.
Please note: This is an educational model, not a breath test. It cannot prove sobriety and must never be used to decide whether to drive. After drinking, use a sober driver, taxi or public transport.
Method: FBI Laboratory TOX-216-01, 18 Feb 2025 — Watson/Widmark equations, distribution-volume variation of ±9.86% for men and ±15% for women, and elimination of 0.10–0.25 g/L per hour. NIAAA defines a standard drink as 14 g ethanol. WHO states that no alcohol use is risk-free.
We derive grams of ethanol from volume and ABV, then apply the individualised Watson/Widmark model using sex, age, height and weight. The range reflects variation in distribution volume and elimination rate.
The result shows an order of magnitude; it does not measure alcohol in blood or breath. Food, drinking pace, medicines, illness and individual metabolism can materially change the real level.
Never use this estimate to decide whether to drive or do hazardous work. Confusion, slow or irregular breathing, seizures or inability to wake someone require emergency help.
Take the short health-factor map and see how this connects to your own lifestyle.