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Blood Alcohol Estimator

Estimate your blood alcohol concentration (BAC) based on drinks consumed, weight, gender, and time elapsed. For educational purposes only. Health data never leaves your device — every calculation runs locally in your browser.

100% Local Browser Native

How to Use the Blood Alcohol Estimator

1. Fill the inputs

Enter drinks, weight, gender, and hours since first drink.

2. Read estimated BAC

Check estimated BAC against the 0.08% marker.

3. Compare scenarios

Re-run with last month's figures for a reality check against this month's plan.

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Frequently Asked Questions

How is BAC estimated?

The Widmark formula estimates BAC based on alcohol consumed, body weight, gender (body water percentage), and time elapsed since drinking started. It provides an approximate BAC percentage: defaults (male, 70 kg, 3 drinks, 2 hours) estimate 0.058%, shown as under the 0.08% limit — still an educational estimate, never a decision tool.

What drink sizes does it use?

Standard drink equivalents: 12 oz beer (5% ABV), 5 oz wine (12% ABV), 1.5 oz spirits (40% ABV). Enter the number of standard drinks consumed.

How accurate is this estimate?

This is a rough estimate only. Actual BAC varies with metabolism, food intake, genetics, medications, and hydration. Never use this to decide if you can drive.

Is this medical advice?

No. This is an educational tool only. Do not use it to make safety decisions. If you've been drinking, do not drive.

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Last updated October 2026