2 drinks, 5% ABV
- Alcohol consumed
- 28.0095 g
- Estimated time to zero
- 2.4325367647 hours
- Widmark estimate
- male
Never use this estimate to decide whether it is safe or legal to drive.
BAC Calculator
Use this free BAC calculator for an educational blood alcohol concentration estimate from drinks, ABV, body weight, sex, and time.
Research-based formula Estimate limits shown Examples included Private history
Formula steps
- Estimate grams of alcohol from drink volume, ABV, and drink count.
- Apply a Widmark-style body-water factor by sex and body weight.
- Subtract an average elimination rate for elapsed time.
How to use the bac calculator
- Enter the requested measurements, dates, lab values, or workout details.
- Check that the units and formula assumptions match what the tool is asking for.
- Press the calculate button to see the answer, supporting metrics, and formula steps.
- Read the estimate with the health disclaimer in mind, then copy the result if you need it for notes.
Common uses
Understand how drink count, ABV, body weight, and time affect an estimate.
Compare different drink sizes and strengths.
See why BAC estimates are uncertain.
Avoid using estimates for legal or safety decisions.
Examples
Estimated BAC after time adjustment
Estimated BAC after time adjustment
Estimated BAC after time adjustment
Frequently asked questions
Quick answers about formulas, inputs, estimate limits, professional guidance, examples, and private in-browser history.
What can I use the BAC Calculator for?
Use it for quick educational estimates, planning, comparison, and trend checks. Health and fitness results should be interpreted with context, not as a diagnosis.
How does the BAC Calculator calculate the result?
The calculator estimates grams of alcohol from drink volume and ABV, applies a Widmark-style body-water factor, then subtracts an average elimination rate.
Is this medical advice?
No. This estimate is not legal, medical, or driving advice. Do not use it to decide whether to drive or perform safety-sensitive tasks.
Are my health inputs private?
Yes. The calculator runs in your browser tab. Recent answers stay only on the page while you use it and are not sent to a server.