Estimate your blood alcohol content from what you drank, when, and who you are.
This calculator uses the Widmark formula — the same starting point breathalyzer math is built on. Enter your weight, sex, what you've had, and how long you've been drinking. It's an estimate, not a measurement: food, medication, fatigue, and individual metabolism all move the real number.
In the US, one standard drink is about 14 grams of pure alcohol. That's a 12 oz beer at 5% ABV, a 5 oz glass of wine at 12%, or a 1.5 oz shot of 80-proof spirits. A strong IPA (7–8%) or a generous pour counts as more than one — which is exactly the kind of math the Sip app does automatically when you snap a photo of your drink.
Widmark's formula: BAC = (alcohol in grams ÷ (body weight in grams × body-water constant)) × 100, minus elimination over time. The body-water constant is ~0.68 for men and ~0.55 for women, and your liver clears roughly 0.015% BAC per hour — about one standard drink per hour. Nothing sobers you up faster: not coffee, not a cold shower, only time.
Calories and ABV for 25+ popular beers, from Michelob Ultra to hazy IPAs.
See the chart →Live BAC estimate, calories, and a morning-after forecast. Free on the App Store.