BAC Calculator

Estimate blood alcohol concentration from standard drinks, body weight, time, and sex.

Preparing BAC Calculator

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Input

Enter sex, body weight, number of standard drinks, and time since drinking started to estimate BAC. This tool shows the result instantly without step-by-step output.

Input summary

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How to use BAC Calculator

Add the basic drinking and body-size details, and the calculator will estimate BAC from that simplified input model.

What this calculator is for

This calculator is for rough alcohol-intake awareness only. BAC estimates vary with drink size, food intake, metabolism, medication, and individual physiology, so the result must never be used to decide whether it is safe or legal to drive.

Tips

Count standard drinks rather than glasses or containers, because drink sizes vary widely.
Food, pace of drinking, and personal metabolism can shift real BAC away from the estimate.
If alcohol use creates a safety question, the safe choice is not to drive or operate equipment regardless of the number shown here.