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Blood alcohol calculator
Estimate your blood alcohol level in per mille with the Widmark formula. Enter your weight, sex and the drinks you had, and see the value now and how long it takes to drop. A rough guide, never a reason to drive.
How to calculate your blood alcohol
- 1Choose metric or imperial, your sex and your weight
- 2Enter how many of each drink you had
- 3Set the hours since your first drink
- Your estimated level now and the time until 0.0 ‰.
What you get
- A level in ‰ and in %.The estimate for right now, plus the highest value if all alcohol were absorbed at once.
- Times to 0.5, 0.8 and 0.0 ‰.See how long until you are below each limit, by this estimate.
- Nothing leaves your device.The numbers are worked out in your browser. Nothing is sent anywhere.
What you can do
- Enter beer (0.5 l and 0.33 l), wine, sparkling wine, spirits and cocktails by number of drinks.
- Add other drinks with your own size and alcohol content.
- Read the result in per mille and in percent BAC.
- See a chart of the level falling hour by hour.
- Work in kilograms or pounds, and in milliliters or fluid ounces.
Good to know
- The calculator uses 0.68 for men and 0.55 for women, and a fixed breakdown of 0.15 ‰ per hour. Real values vary a lot.
- Food, medication, tiredness and drinking speed change the result. Yours can be much higher.
- Do not use it to decide whether you can drive. When in doubt, don't.
Questions
How do you calculate blood alcohol?
The tool turns your drinks into grams of alcohol and divides by your body weight times a factor for your sex (Widmark). It then subtracts 0.15 ‰ for every hour.
How long until I am sober?
The result shows the time until you are below 0.5 ‰, 0.8 ‰ and 0.0 ‰. It is an estimate, and the real time can be longer.
Is the Promille calculator accurate?
No. It is a rough estimate from an average formula. A breath or blood test is the only reliable measure.
Is my data sent anywhere?
No. The calculation runs in your browser, so your weight and drinks stay on your device.