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.
Estimate, not diagnosis Formula notes Example inputs Tab-only 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.
What people use it for
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.
Quick examples
Two beers
2 x 355 mL at 5%Estimated BAC after time adjustment
Wine
2 x 150 mL at 12%Estimated BAC after time adjustment
Spirit drink
45 mL at 40%Estimated BAC after time adjustment
Need the guide or a nearby tool?
Need a slower walkthrough, a related calculator, or the full library? These links keep you close to the task you started.
- How to use the BAC Calculator See slower examples, input meanings, formula notes, result limits, and mistakes to avoid.
- Health & Fitness Browse related calculators and utilities in the same category.
- Calculator and utility guides Find more guides that use real tool inputs and example numbers.
- All free tools Search every live tool, converter, calculator, AI helper, and browser utility.
Frequently asked questions
Plain-language answers about when to use the estimate, what the formula means, what it cannot decide for you, and how privacy works.
When should I use the BAC Calculator?
Use it for simple educational checks, trend tracking, or planning tasks like these: Understand how drink count, ABV, body weight, and time affect an estimate. Compare different drink sizes and strengths. It can help you understand a number, but it cannot explain your whole health situation.
What do the main BAC Calculator inputs mean?
Enter the body, activity, date, or lab values exactly in the units shown on the page. Height, weight, age, sex, time, and activity level can change health estimates a lot, so treat each label like a rule instead of a suggestion. If you are unsure which option fits, choose the closest honest match and read the result as a rough estimate.
What is the BAC Calculator doing with my inputs?
In plain language: The calculator estimates grams of alcohol from drink volume and ABV, applies a Widmark-style body-water factor, then subtracts an average elimination rate. Read the result together with the notes on the page, because health and fitness numbers often need personal context.
How should I read the BAC Calculator result?
Use the result as a learning number, not a final answer about your body or health. The supporting lines can show categories, ranges, calories, dates, or targets, but those numbers still need context like age, medical history, pregnancy status, training level, and advice from a qualified professional.
Can I use this as 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. Use the calculator as a learning tool, then ask a qualified professional about decisions that affect care, pregnancy, medication, nutrition, or safety.
What should I double-check before trusting the result?
Check the units, date, and personal details before reading the answer. For example, pounds and kilograms, inches and centimeters, or a wrong activity level can change the result quickly. If the number feels surprising, rerun it slowly and compare it with the examples.
Does the site save my health inputs?
No. The calculator runs in your browser tab. Recent answers stay only on the page while you use it, and they are not sent to a server.