![]() Therefore, strengthening road safety against drink-driving is a top priority. Many people consume alcohol and drive without knowing their intoxication level. Alcohol is one of the top factors of road crashes in New Zealand every year. It aims to have zero road trauma brought by reckless or impaired driving. BAC as a percentage – (elapsed time in hours x 0.Road to Zero program is New Zealand’s strategy to achieve zero fatalities and casualties in ten years (2030).If you have been drinking over a period of time, you will need to account for the elapsed time and the amount of alcohol that your body has already metabolized by the time you calculate your BAC. Taking the raw number in the step above and multiplying it by 100 will give you your BAC as a percentage.Īccount for elapsed time. This step will give you a raw number based on the alcohol content in your body. A quick internet search will reveal numerous online calculators for converting pounds to grams.ĭivide the alcohol consumed in grams by (body weight in grams x gender constant.).Body weight in pounds x 454 = body weight in grams.Body weight in pounds / 0.0022046 = body weight in grams.If you know your body weight in pounds but not in grams, use one of the following formulas: The gender constant is 0.55 for females and 0.68 for males. Take your body weight in grams and multiply it by the gender constant. If your area has a different alcohol content in a standard drink, you will need to multiply the number of standard drinks consumed by that alcohol content in grams.You can also find the alcohol dose using the formula: (Volume of drinks) x (AC of drinks) x 0.789 = grams of alcohol consumed.This will give you the alcohol dose-the amount of alcohol consumed. Once you have the number of standard drinks consumed, multiply that number by 14 to derive the alcohol dose in grams. In the United States, a standard drink contains approximately fourteen grams of alcohol.įind the alcohol dose.The standard drink size of a wine with a twelve percent volume of alcohol is five ounces.The standard drink size of a beer with a five percent volume of alcohol is twelve ounces.The standard drink size of an 80-proof version of a distilled spirit such as gin or whiskey is approximately 1.5 ounces.The standard drink size varies from country to country and from drink to drink. This is because the volume and content of drinks vary widely. To be as precise as possible, the number of drinks counted should be based on a standard drink size and alcohol content, rather than the number of glasses, bottles, etc. In order to calculate BAC using the Widmark formula, you will need to count how many drinks have been consumed in a given period. In this formula, "r" is the gender constant: r = 0.55 for females and 0.68 for males.Ĭount the number of drinks. The simplified version of the Widmark formula is: BAC = x 100. The amount of alcohol in a drink can vary widely this article will use examples drawing upon the standard drink size in the United States.įind your formula. The most common formula for calculating BAC in this way is known as the Widmark formula. (Beer ~ 4-4.5% Wine ~ 15-20% 1 Shot ~ 30-50%)īlood alcohol content (BAC) can be calculated with simple information such as a person’s weight, gender, and the amount of alcohol consumed in a given period. If your level is greater than 0.05, you could On your weight and the number of drinks you've had (if you're a woman, ![]() To the right will calculate an approximation of your blood alcohol level based But if youĭo, you'd better know your limits. It's never a good idea nor a safe idea to drink and drive. Know Your Limits-Know Your Rights Before You Drink and Drive
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