BAC Calculator

Calculate your estimated Blood Alcohol Content based on drinks consumed, weight, gender, and time elapsed. This calculator uses the Widmark formula for accurate BAC estimation.

Gender

Male Female

Weight

Time Since First Drink

Hours

Minutes

Amount of Alcohol Consumed

Amount Size ABV

Beer

Wine

Liquor

Other

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Result

Estimated BAC

0.00%

Total Alcohol Consumed	0 oz
Total Standard Drinks	0
Time to Zero BAC	0 hours
Status	Sober

BAC Over Time

⚠️ Important Disclaimer

This calculator provides estimates only. Never drink and drive. BAC varies based on metabolism, food intake, medications, and other factors. Use a designated driver, taxi, or rideshare if you've been drinking.

Use Our BAC Calculator to Know the Level of Alcohol in Your Blood

A Blood Alcohol Concentration (BAC) Calculator gives you an estimate of the alcohol level in your bloodstream after drinking. Our BAC Calculator uses standard U.S. drink sizes and trusted calculation methods to give you an estimate based on your weight, gender, number of drinks, and time passed. It processes the data and shows you the percentage of how it is affecting you. It also reflects BAC estimation factors like alcohol absorption rate, drink strength, and your body’s processing speed. Estimation using the TogCalculator BAC calculator aids in identifying your coordination, concentration level, and reaction to something. Its results are easy to understand. The tool gives you a quick way to check your estimated BAC. It lets you know how much alcohol is still left in your body, which it still has to process. The calculator also displays the time that will be required for the BAC level to be completely removed from your body. Your actual BAC level can change with a few things:

Your liver metabolism speed
The meals you had recently
Your medications
Your body’s tolerance level

This calculator is not a legal measurement. It does not give an exact medical or legal reading, but it offers an obvious estimate. It is only for general guidance and don’t take it for medical reference.

How Does our BAC Level Calculator Work?

A BAC calculator uses a formula that considers the following things:

Your weight
Gender
Number of drinks
Drink strength
Time since drinking

Each drink has a specific amount of alcohol. The calculator totals this and adjusts it based on your weight and gender. Through this process, it estimates your body metabolization of alcohol. It also compares your result with general changes shown on an alcohol impairment chart so you can understand the possible effects at different BAC ranges. Most accurate BAC calculators use a version of the Widmark Formula, which is widely used to estimate BAC. It considers: The amount of alcohol consumed which can be the total grams of alcohol from all drinks. This is taken from the drinks types and number. The second thing is the body weight and height. The body weight is converted into grams. It is essential to add in the calculator because obese and healthier bodies process alcohol differently. Distribution Ratio (r) – This is a constant based on gender. You should know that, for men, this distribution ratio is 0.68, and for women it is 0.55. It describes the proportion of body water. The “elimination rate” is also considered in the working of the calculator. This is how your body metabolizes alcohol at an average rate of about 0.015% per hour. This is subtracted from the initial BAC to show the current level.

How Our BAC Calculator Works

Calculate the alcohol dose by identifying the total grams of ethanol from all drinks.
Calculate initial BAC by dividing alcohol dose by “weight × r.”
Subtract the alcohol metabolized over the hours since your first drink.

This estimate BAC calculator provides only an approximation. Factors like metabolism, food, body composition, and medications can affect your actual BAC.

Our Calculator & Standard Drinks Sizes

Our calculator works with the standard U.S. drink sizes

12 oz beer at 5% ABV
5 oz wine at 12% ABV
1.5 oz spirits at 40% ABV

What Is Blood Alcohol Concentration (BAC)?

BAC shows the percentage level of alcohol present in your blood. If BAC shows 0.08%, this means there are 0.08 grams of alcohol per 100 mL of blood running in your bloodstream. Your body weight plays a major role in your BAC level because most limits are based on BAC by weight. BAC affects your thinking capabilities. Higher BAC levels increase the risk of accidents, poor decisions, and health problems. Using an estimate BAC calculator gives a quick view of how alcohol can affect you. Blood Alcohol Content can be measured about 30 to 70 minutes after drinking. Nothing lowers BAC faster except time. Coffee, showers, or drinking fluids will not make you sober quickly and the process will depend on your health and body’s processing time. Everyone metabolizes different alcohols differently. This tool gives an approximate BAC, but it should not be used to decide if you can drive or work.

Why The Use of a BAC Alcohol Calculator is Important

In the U.S., a legal BAC limit is set for the drivers. For drivers over 21, it is 0.08%. Drivers under 21 face stricter limits. Their BAC level should have to be between 0.01% and below 0.05%. Even small amounts of alcohol can increase severe effects and can impair determination and reaction time. A BAC alcohol calculator helps you to be prepared ahead. It shows whether your BAC is likely near legal limits. It can also guide responsible drinking and help avoid risky situations.

Why Use Our BAC Calculator?

Our BAC calculator is fast, simple, and reliable. It gives you a clear estimate of your blood alcohol level in minutes. It helps you track your drinking, and avoid risky situations while impaired. The tool uses standard U.S. drink sizes and trusted formulas. It considers your weight, gender, number of drinks, and drinking time. This makes our estimate BAC calculator more accurate than guessing. Using our BAC alcohol calculator is easy. Enter your details, click calculate, and see your estimated BAC in just seconds. It also shows how long it may take for your BAC to return to zero. Curious about your BAC? Use our BAC calculator to get an estimate.

Benefits of Using Our BAC Calculator

Using our BAC calculator gives you clear insights into your alcohol level.

Our BAC alcohol calculator is simple and quick.
It is more accurate than guessing
It is user friendly and process the data easily

With our estimate BAC calculator, you can:

Track your drinking and understand your limits

Know when it might be unsafe to drive or work
Avoid risky situations caused by overconsumption

Alcohol and Your Health

Alcohol can affect your body in the short term and long term. Short-term effects include

Dehydration
Slower reflexes
Impaired judgment.

Heavy drinking habits for a long time can damage the vital organs. Your vital organs are your liver, heart, and brain. This damage means your life expectancy is moving towards zero. This habit can also increase the risk of some cancers. Using a BAC level calculator helps you monitor your drinking habits to stay on the safer side.

BAC Levels and Their Effects

A BAC calculator shows you the level of alcohol is in your blood. Your BAC rises with every drink and falls over time. In the U.S., a standard drink contains 0.6 fl oz / 14 grams of pure alcohol:

12 fl oz of regular beer

5 fl oz of wine

1.5 fl oz of distilled spirits, which include gin, rum, vodka, and whiskey

BAC Ranges	Its effects on You
0.01–0.06%	Relaxed or slightly tipsy. Coordination and focus are mostly normal.
0.07–0.20%	Impairment grows. Unsteady, emotional, overconfident. Reflexes and judgment decline.
0.21–0.40%	Severe impairment. Disoriented, sick, and sometimes unresponsive. This is dangerous and may require medical attention.
0.41–0.50%	You may lose full control of your body. Breathing becomes slow. The risk of coma is high
Above 0.50%	Life-threatening level. The body Might shut down. Immediate medical help is required.

BAC level does not easily return to zero. It takes time, depending on your health and the quantity you took.

Case Study By the National Highway Traffic Safety Administration (NHTSA)

The study conducted by the NHTSA highlighted how the use of BAC Awareness tools helped in reducing alcohol impaired driving. The National Highway Traffic Safety Administration ran a multi-year study to understand how awareness tools, such as BAC calculators and impairment charts, can impact the drinking behavior of drivers. Their research found that most alcohol-related crashes happened because people believed that drinking and driving is fine and it won’t cause any harm. The other cause wa that such drivers underestimated their BAC level. They did not take it seriously and believed they were still able to drive. To test the impact of awareness tools, NHTSA introduced BAC education resources, including digital BAC estimation tools, impairment charts, and awareness campaigns. These tools helped individuals understand how alcohol absorption rate, tolerance level, and liver metabolism speed affect real BAC levels. After introducing these tools in selected regions, NHTSA saw positive results:

Drivers became more aware of how quickly BAC rises.
People checked their BAC level by weight and the number of drinks before driving.
There was a decline in impaired-driving incidents.
Younger drivers became careful because of the zero tolerance law; they began using BAC calculator to determine their BAC level.

The study also highlighted that people trusted BAC calculators more than guessing. Many users also compared breathalyzer vs BAC calculator results to understand the difference between estimation and actual readings..

Disclaimer

This BAC calculator is for general guidance only. It cannot accurately determine your exact BAC and tell you to make a decision using these details. The main thing is, you yourself know how conscious you are and what you can do. If you have been drinking for a long time, do not drive. The calculator provides the result for your provided data and may not be fully accurate. Everyone metabolizes alcohol differently. When you are using any tool like a calculator, you should agree to the terms and also agree that the information may contain errors. We are not responsible for any consequences from using this calculator.