Results:
Estimated Blood Alcohol Content (BAC) after consumption: — g/dL
Estimated Time to Reach 0.00 BAC: — hours
function calculateElimination() {
var weight = parseFloat(document.getElementById("weight").value);
var gender = document.getElementById("gender").value;
var drinks = parseFloat(document.getElementById("drinks").value);
var drinkTime = parseFloat(document.getElementById("drinkTime").value);
var absorptionRate = parseFloat(document.getElementById("absorptionRate").value);
var resultDiv = document.getElementById("result");
var estimatedBACSpan = document.getElementById("estimatedBAC");
var eliminationTimeSpan = document.getElementById("eliminationTime");
// Clear previous results
estimatedBACSpan.textContent = "–";
eliminationTimeSpan.textContent = "–";
// Basic validation
if (isNaN(weight) || weight <= 0 ||
isNaN(drinks) || drinks <= 0 ||
isNaN(drinkTime) || drinkTime <= 0 ||
isNaN(absorptionRate) || absorptionRate <= 0) {
resultDiv.innerHTML += "Please enter valid positive numbers for all fields.";
return;
}
// Standard drink definition (approximate grams of pure alcohol)
var gramsPerStandardDrink = 14.0; // US standard
// Calculate total grams of alcohol consumed
var totalAlcoholGrams = drinks * gramsPerStandardDrink;
// Estimate the Widmark factor (varies by sex and body composition)
// These are approximate values for total body water
var widmarkFactor;
if (gender === "male") {
widmarkFactor = 0.68; // ~68% of body weight is water for men
} else {
widmarkFactor = 0.55; // ~55% of body weight is water for women
}
// Calculate the volume of distribution (Liters of body water)
var bodyWaterLiters = weight * widmarkFactor;
// Calculate the peak BAC (g/dL) – simplified model
// This is a simplification, absorption is complex and not linear.
// We are calculating the BAC *after* the absorption period, not the peak during it.
// A more accurate peak calculation would involve integrating absorption and elimination.
// For simplicity here, we'll assume drinks are consumed over 'drinkTime'.
// This formula estimates BAC after absorption, not necessarily the absolute peak.
// A common estimation method is based on total alcohol in the body divided by body weight.
// Let's refine this to consider absorption over time.
// A more direct approach for estimation after consumption:
var peakBAC_g_dL_rough = (totalAlcoholGrams / bodyWaterLiters) * 100; // Convert g/L to g/dL
// The absorption rate parameter isn't directly used in the simple Widmark calculation for *final* BAC.
// It's more relevant for the *rate* of BAC increase and peak time.
// For elimination time, we need the BAC *after* consumption.
// Let's adjust to a more common approach: calculating BAC at a specific time point after consumption.
// A common model estimates BAC using total alcohol absorbed and distribution.
// For this calculator, let's estimate BAC at the *end* of the drinking period.
// A very simplified approach: Total alcohol / body water volume
var estimatedBAC_g_dL = (totalAlcoholGrams / bodyWaterLiters) * 100; // g/dL
// Elimination rate is often estimated at 0.015 g/dL per hour (or 15 mg/dL per hour)
var eliminationRate_g_dL_per_hour = 0.015;
// Calculate time to eliminate BAC
var eliminationTime = estimatedBAC_g_dL / eliminationRate_g_dL_per_hour;
// Display results
estimatedBACSpan.textContent = estimatedBAC_g_dL.toFixed(3);
eliminationTimeSpan.textContent = eliminationTime.toFixed(2);
// Add disclaimer
resultDiv.innerHTML += "
Disclaimer: This is a simplified estimation. Actual BAC and elimination rates vary significantly based on individual metabolism, food intake, hydration, medications, and type of alcohol. This calculator is for informational purposes only and should not be used for making decisions about drinking and driving.";
}
.calculator-container {
font-family: sans-serif;
max-width: 600px;
margin: 20px auto;
padding: 20px;
border: 1px solid #ccc;
border-radius: 8px;
box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}
.calculator-container h2 {
text-align: center;
margin-bottom: 15px;
color: #333;
}
.calculator-container p {
text-align: center;
color: #555;
margin-bottom: 20px;
}
.form-group {
margin-bottom: 15px;
}
.form-group label {
display: block;
margin-bottom: 5px;
font-weight: bold;
color: #444;
}
.form-group input[type="number"],
.form-group select {
width: calc(100% – 22px);
padding: 10px;
border: 1px solid #ccc;
border-radius: 4px;
font-size: 1rem;
}
.form-group small {
display: block;
font-size: 0.8em;
color: #666;
margin-top: 3px;
}
button {
display: block;
width: 100%;
padding: 12px;
background-color: #007bff;
color: white;
border: none;
border-radius: 5px;
font-size: 1.1rem;
cursor: pointer;
transition: background-color 0.3s ease;
}
button:hover {
background-color: #0056b3;
}
.calculator-result {
margin-top: 25px;
padding: 15px;
background-color: #e9ecef;
border-radius: 5px;
}
.calculator-result h3 {
margin-top: 0;
color: #333;
}
.calculator-result p {
text-align: left;
margin-bottom: 8px;
color: #444;
}
.calculator-result span {
font-weight: bold;
color: #007bff;
}