BAC Calculator

Estimate your blood alcohol content (BAC) based on drinks consumed, weight, and time. Free online BAC calculator.

About BAC Calculator

Our BAC Calculator estimates your blood alcohol content using the Widmark formula, accounting for gender, body weight, number of standard drinks, and hours since first drink. Includes estimated time to sober. For informational purposes only.

BAC (Blood Alcohol Content) Calculator

Gender

Male Female

Body Weight ?Enter your body weight in kg or lb

Number of Standard Drinks ?A standard drink contains approximately 14g of pure alcohol

drinks

Hours Since First Drink ?Hours elapsed since your first alcoholic beverage

hrs

Estimated BAC

Status

Time to Sober

Calculation Breakdown

Gender --

Body Weight --

Widmark Factor --

Alcohol Absorbed --

Elimination Rate --

Estimated BAC --

BAC Levels

0.02% Relaxation, mild impairment

0.05% Reduced coordination

0.08% Legal limit (US/EU)

0.10% Clear deterioration

0.15%+ Significant impairment

How BAC Is Calculated

BAC is estimated using the Widmark formula, which accounts for alcohol content, body weight, gender (via Widmark factor), and time elapsed. The body eliminates alcohol at approximately 0.015% per hour.

Formula

BAC BAC = (Alcohol grams / (Body weight grams x Widmark factor)) x 100 - (0.015 x Hours)

Widmark Male: 0.68 | Female: 0.55

Real-Life Examples

Social

2 beers in 1 hour: For a 70kg male, BAC ~0.04%. Below legal driving limit but mild impairment.

Dinner

1 glass of wine over 2 hours: BAC ~0.00% for 70kg male. Essentially sober.

Night Out

5 drinks in 3 hours: BAC ~0.10% for 70kg male. Above legal driving limit.

Weight Impact

Same drinks, different weight: A 55kg person reaches higher BAC than an 85kg person with same intake.

Disclaimer: This is an estimate only. Actual BAC varies by metabolism, food intake, and other factors. Never drink and drive.

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Features

Security

Secure & Private

Your files are processed securely and deleted immediately after.

Speed

Fast Processing

Get your results in seconds with our optimized processing engine.

Setup

No Installation

Works entirely in your browser. No software to install.

Pricing

Free to Use

Use this tool completely free with no hidden charges.

Limit

Generous Limits

Enjoy generous file limits with no surprise caps on size or count.

Quality

High Quality Output

Results are rendered at full quality, ready for production use.

Frequently Asked Questions

Is BAC Calculator free to use?

Yes, this tool is completely free to use. There are no hidden fees or subscription requirements.

Are my files safe and secure?

Absolutely. All file processing happens securely. Your files are automatically deleted from our servers after processing.

What file formats are supported?

This tool supports a wide range of common file formats. Check the upload area for specific format requirements.

Do I need to create an account?

No account is required. Simply upload your file, process it, and download the result.

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