Free blood alcohol content (BAC) calculator using the Widmark formula. Enter your weight, gender, number of drinks, and time elapsed to estimate your BAC level. See impairment levels, legal limits, and estimated time until sober. Important: this is an estimate only.
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Using the Widmark formula: BAC = (Alcohol in grams / (Body weight × distribution ratio)) - (0.015 × hours). The distribution ratio is 0.68 for men and 0.55 for women.
In the US, the legal limit is 0.08% for drivers 21+. Many countries have lower limits (0.05% in Australia, 0.03% in Japan). Commercial drivers in the US have a 0.04% limit.
Your body eliminates alcohol at approximately 0.015% BAC per hour. So from 0.08% BAC, it takes about 5.3 hours to reach 0.00%.
Using the BAC Calculator is simple: visit the tool page, enter your data or input into the provided fields, and get instant results. No downloads, installations, or sign-ups are required. The tool runs directly in your web browser for maximum convenience.
Yes, the BAC Calculator is 100% free to use with no limitations. There is no registration required, no daily usage caps, and no hidden fees. You can use it as many times as you need.
Yes, after running your calculation you can copy the results to your clipboard or take a screenshot. The BAC Calculator displays a detailed breakdown so you can easily record or share your numbers. No account is required to use or save results.
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Free blood alcohol content (BAC) calculator using the Widmark formula. Enter your weight, gender, number of drinks, and time elapsed to estimate your BAC level. See impairment levels, legal limits, and estimated time until sober. Important: this is an estimate only.
NexTool's BAC Calculator is completely free to use with no sign-up required. Your data is processed directly in your browser and never sent to our servers, ensuring complete privacy and instant results.
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| Country | Legal Limit | Your Status |
|---|---|---|
| United States | 0.08% | Under Limit |
| United Kingdom | 0.08% | Under Limit |
| Canada | 0.08% | Under Limit |
| Australia | 0.05% | Under Limit |
| Germany | 0.05% | Under Limit |
| France | 0.05% | Under Limit |
| Japan | 0.03% | Under Limit |
| Sweden | 0.02% | Under Limit |
| Norway | 0.02% | Under Limit |
| Poland | 0.02% | Under Limit |