Blood Alcohol Content (BAC) Calculator
Estimate your blood alcohol content from drinks, weight and time using the Widmark formula.
Estimated BAC
0.058%
Impairment likely (0.05%+).
Disclaimer: This is a rough Widmark estimate for education only, not medical or legal advice. Never use it to decide whether to drive. Many factors affect real BAC.
Enter your sex, weight, number of standard drinks and hours since your first drink to estimate BAC.
How to use
- Select your sex and enter your body weight.
- Enter the number of standard drinks consumed.
- Enter hours since your first drink to estimate BAC.
Frequently asked questions
- What is a standard drink?
- A standard drink contains about 14 grams of pure alcohol, roughly a 355 ml beer, 150 ml wine or 44 ml of spirits.
- Can I use this to decide to drive?
- Never. Results are estimates only and not medical or legal advice. If you have been drinking, do not drive.