How to Calculate Blood Alcohol Content (Widmark Formula)

Here you can get information about How to Calculate Blood Alcohol Content (Widmark Formula). Blood alcohol content (BAC) are often calculated with simple information like a person’s weight, gender, and therefore the amount of alcohol consumed during a given period.

The foremost common formula for calculating BAC during this way is understood because the Widmark formula. The quantity of alcohol during a drink can vary widely; this article will use examples, drawing upon the quality drink size within the US.

Table of Contents

Calculating BAC Using the Widmark Formula

  • Find your formula. The simplified version of the Widmark formula is: BAC = [Alcohol consumed in grams / (Body weight in grams x r)] x 100. During this formula, “r” is that of the gender constant: r = 0.55 for females and 0.68 for males.
  • Count the amount of drinks. To calculate BAC using the Widmark formula, you’ll get to count what percentage of drinks are consumed during a given period. To be as precise as possible, the amount of drinks counted should be supported a typical drink size and alcohol content, instead of the amount of glasses, bottles, etc. consumed. This is often because the quantity and content of drinks vary widely. The quality drink size varies from country to country and from drink to drink. Within the United States:
    • The standard drink size of an 80-proof version of a distilled spirit like gin or whiskey is approximately 1.5 ounces. This is about forty percent alcohol.
    • The standard drink size of a beer with a five percent volume of alcohol is twelve ounces.
    • The standard drink size of a wine with a twelve percent volume of alcohol is five ounces.
    • Within the US, a typical drink contains approximately fourteen grams of alcohol.
  • Find the alcohol dose. Once you’ve got the amount of ordinary drinks consumed, multiply that number by 14 to derive the alcohol dose in grams. This may offer you the alcohol dose—the amount of alcohol consumed.
    • You’ll also find the alcohol dose using the formula: (Volume of drinks) x (AC of drinks) x 0.789 = grams of alcohol consumed
    • If your area features a different alcohol content during a standard drink, you’ll get to multiply the amount of ordinary drinks consumed by that alcohol content in grams.
  • Take your weight in grams and multiply it by the gender constant. The gender constant is 0.55 for females and 0.68 for males. If you recognize your body weight in pounds but not in grams, use one among the subsequent formulas:
    • body weight in pounds / 0.0022046 = body weight in grams
    • body weight in pounds x 454 = body weight in grams
    • a fast internet search will reveal numerous online calculators for converting pounds to grams.
  • Divide the alcohol consumed in grams by (body weight in grams x gender constant.). This step will offer you a raw number supported the alcohol content in your body.
  • Multiply the raw number by 100. Taking the raw number within the step above and multiplying it by 100 will offer you your BAC as a percentage.
  • Account for elapsed time. If you’ve got been drinking over a period of your time, you’ll get to account for the time period and therefore the amount of alcohol that your body has already metabolized by the time you calculate your BAC. To do this, use the subsequent formula:
    • BAC as a percentage – (elapsed time in hours x 0. 015)

Trying an Example of the Widmark Formula Calculation

  • Understand the instance. Imagine that a 120 pound woman consumed four 1.5 ounce drinks of an 80 proof liqueur over a five-hour period.
  • Count the amount of drinks. Four 1.5 ounce drinks of an 80 proof liqueur is like four standard drinks within the US.
  • Find the alcohol dose. Multiply the amount of ordinary drinks in this example (4) by 14 (the number of grams of alcohol during a standard drink in the United States) to seek out the alcohol dose, 56 grams of alcohol.
  • Multiply the weight in grams and multiply it by the gender constant. 120 pounds is like 54480 grams (120 pounds x 454 grams per pound). Multiplying this by the gender constant (in this example, 0.55) = 29964
  • Divide the alcohol consumed in grams by (body weight in grams x gender constant.). During this example, this equals approximately 0.0018689093579 (56 / 29964). For a less exact calculation, you’ll round this number to 0.00186.
  • Multiply the raw number by 100. During this example, this provides the amount 0.186 (0.00186 x 100). This number reflects the approximate BAC as a percentage, before accounting for time period.
  • Account for time period. During this example, you ought to first multiply the amount of time period in hours (5) by 0.015 = 0.075. Then, subtract this number from the approximate BAC as a percentage: 0.186 – 0.075 = 0.111. This suggests that the approximate BAC during this example at the top of the five-hour period is 0.111.

Tips

  • Whether you’ve got eaten food before drinking alcohol will affect your BAC.

Warnings

  • The Widmark formula is merely a rough indicator of BAC. In most cases, the Widmark formula underestimates the particular BAC.
  • No formula for calculating BAC is as accurate as an actual measured test.
  • It’s never okay to drive after drinking, no matter what you’ll calculate as your BAC using this formula.
How to Calculate Blood Alcohol Content (Widmark Formula)

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