Kitchen Calculators

Alcohol Calculator

Calculate your estimated Blood Alcohol Content (BAC). This tool uses the Widmark formula. Standard US measurements are used.
Disclaimer: This is an estimate only. Do not rely on this calculator to determine if you are safe to drive.

Table of Contents

About You

Weight *

lbs

Biological Sex *

Time since first drink *

Hours

Drinks Consumed

Quick Add Standard Drinks:

Ready to Calculate

Fill in your weight, biological sex, hours spent drinking, and drinks consumed to estimate your BAC.

Standard BAC Reference Chart

These tables provide a rough estimate of Blood Alcohol Content (BAC) for men and women after one hour of drinking. One standard drink = 0.6 oz of pure alcohol (e.g., one 12 oz beer, 5 oz wine, or 1.5 oz liquor).
This is for informational purposes only. Do not rely on this to determine your ability to drive.

Men (approx. BAC after 1 hour)

Drinks	120 lbs	140 lbs	160 lbs	180 lbs	200 lbs	220 lbs
1	0.02%	0.02%	0.01%	0.01%	0.01%	0.00%
2	0.06%	0.05%	0.04%	0.03%	0.03%	0.02%
3	0.09%	0.08%	0.06%	0.06%	0.05%	0.04%
4	0.13%	0.11%	0.09%	0.08%	0.07%	0.06%
5	0.16%	0.14%	0.12%	0.10%	0.09%	0.08%
6	0.20%	0.17%	0.14%	0.13%	0.11%	0.10%

Women (approx. BAC after 1 hour)

Drinks	120 lbs	140 lbs	160 lbs	180 lbs	200 lbs	220 lbs
1	0.02%	0.02%	0.01%	0.01%	0.01%	0.01%
2	0.06%	0.05%	0.04%	0.04%	0.03%	0.03%
3	0.10%	0.09%	0.07%	0.06%	0.06%	0.05%
4	0.14%	0.12%	0.10%	0.09%	0.08%	0.07%
5	0.18%	0.15%	0.13%	0.12%	0.10%	0.09%
6	0.22%	0.19%	0.16%	0.14%	0.13%	0.11%

0.08% - 0.09% (Legally Impaired)

0.10% - 0.15% (Significantly Impaired)

0.16%+ (Severely Impaired)

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