BAC Calculator

Estimate your Blood Alcohol Content (BAC) based on drinks, weight, time and gender.

✓ Free to use ✓ Instant results ✓ Mobile friendly ✓ No sign-up needed

Weight (kg)

Sex

Standard Drinks Consumed

Hours Since First Drink

Estimated BAC

Status

Hours to Sober

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How BAC is Calculated

BAC uses the Widmark formula: BAC = (alcohol consumed in grams) ÷ (weight × distribution factor) × 100. Alcohol is eliminated at ~0.015% BAC per hour.

Legal Limits

Frequently Asked Questions

What is the UK drink drive limit?+

In England and Wales: 0.08% BAC (80mg/100ml blood). In Scotland: 0.05% BAC.

How long does alcohol stay in your system?+

The liver processes roughly one standard drink per hour. A BAC of 0.08% takes ~5 hours to clear.

BAC Calculator

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How BAC is Calculated

Legal Limits

Frequently Asked Questions

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