Alcohol Consumption Calculator

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Alcohol Consumption & BAC Calculator

Estimate your Blood Alcohol Content (BAC) based on the Widmark Formula.

Male Female
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Disclaimer: This calculator is for educational and entertainment purposes only. It uses mathematical averages and cannot accurately account for individual factors like metabolism, hydration, or food intake. Never drink and drive. If you have consumed any alcohol, use a designated driver or ride-sharing service.

What is Blood Alcohol Content (BAC)?

Blood Alcohol Content, or BAC, is a measurement of the percentage of alcohol present in a person's bloodstream. For example, a BAC of 0.08% means that there are 0.08 grams of alcohol for every 100 milliliters of blood. This metric is used worldwide by law enforcement and medical professionals to determine levels of intoxication and impairment.

How This Calculator Works

This tool utilizes the Widmark Formula, the industry standard for estimating alcohol distribution in the human body. The formula considers your weight, biological sex (which affects the volume of distribution for water and alcohol), the amount of alcohol consumed, and the time elapsed since you started drinking.

A "Standard Drink" in the United States is generally defined as containing roughly 14 grams of pure alcohol. This typically equates to:

  • 12 ounces of regular beer (approx. 5% alcohol).
  • 5 ounces of wine (approx. 12% alcohol).
  • 1.5 ounces of distilled spirits (approx. 40% alcohol).

Factors That Affect Alcohol Metabolism

While the calculator provides a mathematical estimate, real-world BAC levels can be influenced by several variables:

  • Food Intake: Drinking on an empty stomach leads to faster alcohol absorption.
  • Body Composition: Muscle tissue contains more water than fat tissue, which helps dilute alcohol more effectively.
  • Medications: Certain prescriptions can interact with alcohol, heightening its effects or slowing metabolism.
  • Rate of Consumption: Drinking multiple servings in a short window causes a rapid spike in BAC that the liver cannot keep up with.

BAC Levels and Their Effects

BAC Level Typical Effects
0.02% – 0.04% Lightheadedness, relaxation, slight loss of judgment.
0.05% – 0.07% Exaggerated behavior, lowered inhibitions, impaired coordination.
0.08% + Legal intoxication limit in most US states. Significant impairment of motor skills and balance.
0.15% – 0.20% Severe intoxication, vomiting potential, major loss of balance.
function calculateBAC() { var weightInput = document.getElementById('weight'); var genderInput = document.getElementById('gender'); var drinksInput = document.getElementById('drinks'); var hoursInput = document.getElementById('hours'); var resultDiv = document.getElementById('bac-result'); var statusDiv = document.getElementById('bac-status-text'); var outputBox = document.getElementById('bac-output-box'); var weight = parseFloat(weightInput.value); var gender = genderInput.value; var drinks = parseFloat(drinksInput.value); var hours = parseFloat(hoursInput.value); if (isNaN(weight) || weight <= 0 || isNaN(drinks) || drinks < 0 || isNaN(hours) || hours < 0) { alert("Please enter valid positive numbers for all fields."); return; } // Standard drink = 14 grams of alcohol var alcoholGrams = drinks * 14; // Weight in grams (1 lb = 453.592 grams) var weightGrams = weight * 453.592; // Gender constant (Widmark r) // Male: 0.68, Female: 0.55 var r = (gender === 'male') ? 0.68 : 0.55; // Calculate raw BAC // Formula: [Alcohol consumed in grams / (Body weight in grams * r)] * 100 var rawBAC = (alcoholGrams / (weightGrams * r)) * 100; // Metabolism reduction (Average rate 0.015% per hour) var reduction = hours * 0.015; var finalBAC = rawBAC – reduction; if (finalBAC < 0) { finalBAC = 0; } // Update UI resultDiv.innerHTML = finalBAC.toFixed(3) + "%"; var status = ""; var color = "#2ecc71"; if (finalBAC <= 0) { status = "Sober"; color = "#2ecc71"; } else if (finalBAC < 0.05) { status = "Below legal limit for most activities. Slight impairment."; color = "#f1c40f"; } else if (finalBAC < 0.08) { status = "Approaching legal limit. Significant impairment of judgment."; color = "#e67e22"; } else { status = "Legally intoxicated. Do not drive or operate machinery."; color = "#e74c3c"; } statusDiv.innerHTML = status; resultDiv.style.color = color; outputBox.style.display = "block"; }

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