Blood Alcohol Content Calculator
Estimate BAC with editable drink, body-water, and metabolism assumptions.
Inputs
Blood Alcohol Calculator
Results update as you type.
Live result
Estimated BAC
0.029%
Scenario compare
Save scenario A, change a few inputs, then save scenario B.
Scenario A
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Scenario B
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Quick check
Change one or two inputs to compare a second scenario before using the number.
Need more detail?
Formula, examples, and FAQ stay tucked away until you need them.
FXFormula ExplanationThe core logic behind the numbers on this page.+
This calculator uses a transparent arithmetic formula to estimate blood alcohol content based on the inputs provided. The editable assumptions are included where rates or rules can vary, such as drink strength, body weight, and metabolism rate. The calculator provides an estimate, which should be verified against official or current rules when making decisions involving money, health, or the law.
USEHow to UseA short path from input to result.+
- Enter the requested inputs.
- Keep any editable rule or rate fields aligned with your situation.
- Review the result and notes before using the estimate.
EXExamplesReference scenarios to sanity-check your inputs.+
Adjust the defaults to match your scenario, then calculate the estimate.
FAQFAQCommon edge cases and quick clarifications.+
How accurate is this calculator?
This calculator provides an estimate and should be verified against official or current rules when making decisions involving money, health, or the law.
Can I change the assumptions?
Yes, you can edit the rate and rule fields to match your specific situation.
Is this calculator original?
Yes, this page uses an original implementation of the calculator, with rewritten formulas, labels, and copy.
What is the purpose of this calculator?
This calculator is for educational and planning purposes only, and should not be used to make decisions without verifying the information against official sources.
How do I use this calculator?
Enter the requested inputs, keep any editable rule or rate fields aligned with your situation, and review the result and notes before using the estimate.