yCalculator

BAC Calculator

Last updated: April 2026

Unit system

Sex

lb
drinks
ml
%
hrs

Estimated BAC

0.024%

Low estimated BAC

Breakdown

Alcohol consumed28g / 0.99 oz
Raw BAC before metabolism0.039%
Estimated metabolism deduction0.015%

Safety warning

This BAC estimate is not legal or medical advice. Do not use it to decide whether you can drive. Alcohol impairment varies by person and situation.

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What is BAC?

BAC means Blood Alcohol Concentration. It estimates the amount of alcohol in the bloodstream.

How is BAC estimated?

This calculator uses a simplified Widmark formula based on pure alcohol consumed, body weight, sex, and estimated metabolism over time.

Why BAC estimates vary

BAC can vary because of body size, sex, food intake, metabolism, medication, health, drink strength, and measurement accuracy.

Can I use this to decide if I can drive?

No. This calculator must not be used to decide whether driving is safe or legal.

What does this mean?

This calculator is designed to help you understand the likely number before you make a decision or start an application.

Your result should be checked against official UK guidance, especially if your circumstances include dependants, exemptions, prior leave, or a complex immigration history.

Treat the figure as a planning tool rather than legal advice. Where the answer affects an application deadline or major payment, speak to an authorised adviser.

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