Blood Alcohol and Sobering Time Calculator
Estimate blood alcohol, peak level, and elimination time with flexible drink entries
kg
h
‰/h
Drinks
Estimated current blood alcohol
Estimated peak
Pure alcohol
Additional time to 0.00‰
Elimination rate used
This estimate cannot replace a breath or blood test and must never be used to decide whether you are fit to drive.
The estimate uses the Widmark formula and linear elimination. Absorption, food, medication, health, and individual metabolism can substantially change the real result. If in doubt, do not drive.
What this alcohol calculator estimates
Enter each beverage by its size in milliliters and alcohol by volume. This avoids tying the calculator to any country's definition of a “standard drink.” The results show estimated pure alcohol, a theoretical peak, the current estimate after the entered time, and the remaining mathematical elimination time.
Every result is approximate. Even small amounts of alcohol can impair perception and reaction time. A displayed result of 0.00‰ does not prove sobriety or fitness to drive.
Frequently Asked Questions
How does the alcohol calculator estimate blood alcohol?
The calculator first derives pure alcohol from each beverage's milliliters and alcohol by volume. The Widmark formula estimates a theoretical peak using body weight and a distribution factor. The current estimate subtracts the selected hourly elimination rate over the elapsed time. Real absorption and elimination are not perfectly linear.
How accurate are the blood alcohol and sobering-time results?
Both are rough estimates only. Food, drinking duration, body composition, health, medication, and individual metabolism can substantially change the real value. A result of 0.00‰ does not prove sobriety or fitness to drive.
Why does the calculator use beverage size and alcohol percentage?
Definitions of a standard drink vary around the world. Entering milliliters and alcohol by volume lets the same calculation work for beer, wine, spirits, cocktails, and different serving sizes without assuming one country's standard drink.
Can I use the result to decide whether to drive?
No. The calculator is not a measuring device and cannot account for every personal or legal factor. Never treat an estimate as permission to drive. Arrange a sober driver or another safe way home after drinking.