🍺 Health Calculator

BAC Calculator

Estimate your Blood Alcohol Content using the Widmark formula. For educational and harm-reduction purposes only — never drink and drive.

Your Details

Enter weight, drinks, and time elapsed

1 standard drink = 14g pure alcohol (355ml beer 5%, 150ml wine 12%, 45ml spirits 40%)
Enter your details
Always plan ahead — use a designated driver or rideshare after drinking.

BAC Effects Guide

BAC %Effects
0.02–0.03Slight warmth, mild relaxation
0.04–0.06Lowered inhibitions, mild euphoria
0.07–0.09Impaired judgment — do NOT drive
0.10–0.15Clearly intoxicated, coordination loss
0.16–0.30Severe impairment, blackout risk
0.31+Life-threatening — seek help

Frequently Asked Questions

How accurate is this calculator?
This uses the Widmark formula, a widely accepted method for BAC estimation. Accuracy varies by ±20–30% due to individual differences in metabolism, food intake, medications, and hydration. Always err on the side of caution.
How long does it take to sober up?
The body metabolizes alcohol at approximately 0.015% BAC per hour — roughly one standard drink per hour. Coffee, water, sleep, and food do not speed this up significantly.
What is the legal BAC limit?
Most countries set the limit at 0.05% (e.g., Singapore, Australia, EU) or 0.08% (USA, UK). New drivers and professional drivers often face stricter limits of 0.00–0.02%.