BAC Calculator USA
Check Your BAC in the USA
If you’ve been drinking and don’t have a breathalyzer handy, this tool is for you. We get it, you might be a little buzzed right now. That’s why we’ve made it super simple to check whether you could be over the legal alcohol limit for driving in the United States.
Blood Alcohol Concentration (BAC) Calculator
Our BAC Calculator gives you a quick estimate of how much alcohol is in your system, based on:
- Your weight
- How many drinks you’ve had
- How long you’ve been drinking
This helps you understand how your BAC might relate to the U.S. legal driving limit of 0.08%.
Calculate Your BAC
Enter your details below to get an estimate of your BAC after drinking. This calculator is for people who want to quickly know:
- Am I safe to drive after drinking?
- How many drinks put me over 0.08%?
- How long does alcohol stay in my system?
Important Disclaimer
This BAC calculator provides only an estimate. Everyone processes alcohol differently depending on factors like:
- How much food you’ve eaten
- The type of alcohol you drank
- Your metabolism and genetics
- Medications or health conditions
Because of these differences, this tool cannot guarantee accuracy. Never rely on this calculator to decide whether it’s safe to drive.
The only way to be certain you’re under the legal limit is to avoid alcohol before driving or use a certified breathalyzer.
Why Use a BAC Calculator?
Every month, thousands of Americans search questions like:
- “Am I over the limit after 2 drinks?”
- “How many drinks can I have before driving in the USA?”
- “Check BAC without a breathalyzer.”
This tool gives you a rough guide so you can make safer choices and understand how alcohol affects your body.
Know the Law
- U.S. Legal Limit: 0.08% BAC for drivers 21 and over
- Zero Tolerance: Drivers under 21 can face penalties for BAC as low as 0.01%
- Commercial Drivers: Limit is 0.04% BAC