BAC Calculator

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. Follow the controls on the page. Some functions require sign-in or a paid plan; see Pricing for limits.

The Free plan includes 10 tool uses per day. Some features require an account or a paid plan. Check the controls on the tool page and Pricing for the applicable limits.

Yes, the BAC Calculator is fully responsive and works perfectly on smartphones, tablets, and desktop computers. Simply open NexTool in your mobile browser and navigate to the tool — no app download required.