Understanding Blood Alcohol Concentration
Warning and Release
Before using the blood alcohol calculator you must check the boxes below and click the "I Accept" button.
I understand that although a person's BAC can be estimated, the exact level cannot be determine solely by the number of drinks consumed, and cannot be precisely calculated by a person's weight and gender. This blood alcohol calculator is to be used as a guideline only and should NOT be used as the sole way to determine someone's blood alcohol concentration or intoxication level.
I understand that the blood alcohol calculator is being provided to me on an "as is" basis and that I am using it entirely at my own risk. I further understand that Smart Serve Ontario is disclaiming all representations, warranties, conditions, guarantees or conditions of any kind either express or implied regarding the completeness, accuracy, reliability, usefulness, availability or appropriateness of the tool, including any results that may be obtained from my use. I acknowledge that the results may include technical inaccuracies and that Smart Serve Ontario, its directors, officiers or employees will not be liable to me for any damages of any kind arising from my use of the blood alcohol calculator tool.
You must accept the terms above before continuing
Toggle the four key variables below to find your BAC.
# of drinks
# of hours
After 0 drinks in 1 hours your BAC would be approximately 0.00
Yellow bars indicate a BAC of 0.05 or over. Driving with this BAC Level or higher may result in a driver's licence suspension under the Highway Traffic Act.
Red bars indicate a BAC of 0.08 or over. Driving with this BAC level or higher is an offence under the Criminal Code of Canada.
Male Calculations are based on a 25-year-old in good health.
Age is not a factor when determining the calculation for females.
- How fast a person's BAC rises depends on a number of factors including: Body size and fat, gender, physical health, fitness, age, time between drinks, food and non-alcoholic drinks, medication, tolerance and the environment.
- This chart assumes a highly conservative elimination rate of alcohol from the body of 0.015mg/100ml/hr. Rates may vary between 0.01 and 0.025mg per 100ml/hr.
- Chart assumes at least one drink per hour. Under most social drinking conditions, drinks are consumed every 20 minutes at a rate of three per hour in a one to two hour period. Patterns will change with extended periods of drinking.
- Chart is based on the maximum BAC attainable per drink which may not occur during periods of extensive drinking or during the consumption of food with alcohol.
- Blood alcohol percentages on the charts have been truncated to two decimals.
BAC charts are courtesy of the Academy of Forensic Toxicology (TAFT), James Wigmore, President (Senior Scientist, Retired, Toxicology Section, Center of Forensic Sciences).
A Blood Alcohol Concentration (BAC) Chart is a general guidline only and NOT the sole way to determine someone's intoxication level. Other factors such as body type and age will impact BAC levels indicated here.
How to use this chart:
Click on the four key variables that apply to your situation:
- Your gender – male or female
- Your weight in pounds (lbs.)
- Number of hours you've been drinking
- Total number of drinks you've had
Refresh the page when any of the key variables are changed.
A Blood Alcohol Concentration (BAC) chart is a general guideline only and NOT the sole way to determine someone's intoxication level.
Other factors to consider when assessing BAC:
- Age (men only)
- Absorption rate
- Amount of food eaten
- Fitness level
Impairment begins with the first drink.