Alcoholic Drink Calculator

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Alcoholic Drink & BAC Calculator

Male Female

Drinks Consumed

Total Standard Drinks: 0

Estimated BAC: 0.000%

Disclaimer: This calculator provides estimates only. Individual metabolism varies. Never drink and drive.

Understanding the Alcoholic Drink Calculator

Whether you are hosting a party or tracking your intake for health reasons, understanding how alcohol affects your body is vital. This tool calculates two main metrics: Standard Drinks and Blood Alcohol Content (BAC) using the Widmark formula.

What is a "Standard Drink"?

Not all drinks are created equal. A "standard drink" is defined as any beverage containing approximately 14 grams of pure alcohol (about 0.6 fluid ounces). For example:

  • 12 oz of regular beer (5% ABV)
  • 5 oz of table wine (12% ABV)
  • 1.5 oz of distilled spirits (40% ABV)

How BAC is Calculated

The calculator uses the Widmark Formula, which takes into account your weight, gender, the amount of alcohol consumed, and the time elapsed. The formula used is:

BAC = [ (Alcohol in grams / (Body weight in grams * r)) * 100 ] – (Elapsed time * 0.015)

Where r is the gender constant (0.68 for men and 0.55 for women). We also subtract 0.015% for every hour that has passed, representing the average rate at which the human body metabolizes alcohol.

Calculation Example

Suppose a 180 lb male drinks three 12 oz beers (5% ABV) over a period of 2 hours.

  1. Total Alcohol: 3 drinks × 12 oz × 0.05 = 1.8 oz of pure alcohol.
  2. Grams of Alcohol: 1.8 oz × 23.3 = 41.94 grams.
  3. Initial BAC: Based on weight and the male constant (0.68), the peak BAC would be approximately 0.076%.
  4. Metabolism: After 2 hours, we subtract 0.03% (2 × 0.015).
  5. Final Result: The estimated BAC would be roughly 0.046%.

Critical Safety Factors

While this calculator provides a mathematical estimate, several physiological factors can influence your actual BAC, including:

  • Food Consumption: Alcohol is absorbed slower on a full stomach.
  • Metabolism Rate: Some individuals process alcohol faster than the average 0.015% per hour.
  • Medication: Many drugs interact with alcohol and can heighten impairment.
  • Hydration: Dehydration can lead to higher concentrations of alcohol in the blood.
function calculateBAC() { var genderConstant = parseFloat(document.getElementById('gender').value); var bodyWeightLbs = parseFloat(document.getElementById('bodyWeight').value); var timePassed = parseFloat(document.getElementById('timePassed').value); // Get drink 1 inputs var vol1 = parseFloat(document.getElementById('vol1').value) || 0; var abv1 = parseFloat(document.getElementById('abv1').value) || 0; var qty1 = parseFloat(document.getElementById('qty1').value) || 0; // Get drink 2 inputs var vol2 = parseFloat(document.getElementById('vol2').value) || 0; var abv2 = parseFloat(document.getElementById('abv2').value) || 0; var qty2 = parseFloat(document.getElementById('qty2').value) || 0; if (isNaN(bodyWeightLbs) || bodyWeightLbs <= 0) { alert("Please enter a valid weight."); return; } // Calculation of pure alcohol in ounces // Formula: Volume * (ABV/100) * Quantity var totalOzPure = (vol1 * (abv1 / 100) * qty1) + (vol2 * (abv2 / 100) * qty2); // Standard Drink calculation (1 standard drink = 0.6 oz pure ethanol) var standardDrinks = totalOzPure / 0.6; // Convert weight to grams (1 lb = 453.592 grams) var weightInGrams = bodyWeightLbs * 453.592; // Convert pure alcohol ounces to grams (1 fluid oz ethanol = 23.33 grams) var alcoholGrams = totalOzPure * 23.33; // Widmark Formula: BAC = (Alcohol in grams / (Weight in grams * r)) * 100 var rawBAC = (alcoholGrams / (weightInGrams * genderConstant)) * 100; // Metabolism: Average rate is 0.015% per hour var metabolized = timePassed * 0.015; var finalBAC = rawBAC – metabolized; if (finalBAC < 0) finalBAC = 0; // Display Results document.getElementById('results-area').style.display = 'block'; document.getElementById('totalDrinks').innerText = standardDrinks.toFixed(2); document.getElementById('bacResult').innerText = finalBAC.toFixed(3) + "%"; var status = document.getElementById('statusIndicator'); if (finalBAC === 0) { status.innerText = "Sober / Negligible"; status.style.backgroundColor = "#27ae60"; status.style.color = "#fff"; } else if (finalBAC < 0.05) { status.innerText = "Below Legal Driving Limit (Most Regions)"; status.style.backgroundColor = "#f1c40f"; status.style.color = "#000"; } else if (finalBAC 0) { document.getElementById('timeToSober').innerText = "Estimated time until BAC reaches 0.000%: Approximately " + hoursToSober.toFixed(1) + " hours."; } else { document.getElementById('timeToSober').innerText = ""; } }

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