Alcohol Calculator

Free alcohol calculator to estimate blood alcohol concentration. Instant results in your browser — no signup.

JavaScript is required for live calculation.

You can still read how Alcohol Calculator works, the formula, examples, and FAQs below.

Drinks
Timing
Weight
Sex
Assumptions

Assessment

Score or classify a result against reference ranges.

Measurements

Enter values to score against reference ranges.

Drinks

Timing

Weight

Sex

Assumptions

Results update when you click Calculate.

Assessment

Interpret the score, status, and range.

BAC

0.659

((drinks) * 5.14 / ((timing) * (weight || 0.68)) - 0.015 * (sex))

0.7

BAC

LowMidHigh

Balanced meals

30 min activity

Stay hydrated

7–8 hrs sleep

Screening only — not a medical diagnosis.

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Recently used

Tools you open will show up here on this device — with your last inputs when available.

What this result means

Free alcohol calculator to estimate blood alcohol concentration. Instant results in your browser — no signup. Estimate blood alcohol concentration: ((drinks) * 5.14 / ((timing) * (weight || 0.68)) - 0.015 * (sex)).

Assumptions

Rule dependency: Jurisdiction/physiology assumptions.

How it works

Estimate blood alcohol concentration: ((drinks) * 5.14 / ((timing) * (weight || 0.68)) - 0.015 * (sex)).

Example

Example: “bac calculator”. Enter your values and click the button to get a result.

Frequently asked questions

What does this blood alcohol concentration calculator do?+

It helps you estimate blood alcohol concentration. Typical search: “bac calculator”.

How should I read the result?+

Estimate blood alcohol concentration using drinks; timing; weight; sex; assumptions. Result: estimated BAC.