Calories Calculator Food

.cal-container {
font-family: -apple-system, BlinkMacSystemFont, “Segoe UI”, Roboto, Helvetica, Arial, sans-serif;
max-width: 800px;
margin: 20px auto;
padding: 25px;
border: 1px solid #e1e1e1;
border-radius: 12px;
background-color: #ffffff;
box-shadow: 0 4px 6px rgba(0,0,0,0.05);
}
.cal-header {
text-align: center;
margin-bottom: 30px;
}
.cal-grid {
display: grid;
grid-template-columns: 1fr 1fr;
gap: 20px;
margin-bottom: 25px;
}
.cal-input-group {
display: flex;
flex-direction: column;
}
.cal-input-group label {
font-weight: 600;
margin-bottom: 8px;
color: #333;
}
.cal-input-group input {
padding: 12px;
border: 1px solid #ccc;
border-radius: 6px;
font-size: 16px;
}
.cal-btn {
grid-column: span 2;
background-color: #27ae60;
color: white;
border: none;
padding: 15px;
font-size: 18px;
font-weight: bold;
border-radius: 6px;
cursor: pointer;
transition: background-color 0.3s;
}
.cal-btn:hover {
background-color: #219150;
}
.cal-result {
margin-top: 30px;
padding: 20px;
background-color: #f9f9f9;
border-radius: 8px;
display: none;
}
.cal-result h3 {
margin-top: 0;
color: #27ae60;
border-bottom: 2px solid #27ae60;
padding-bottom: 10px;
}
.res-item {
display: flex;
justify-content: space-between;
padding: 10px 0;
border-bottom: 1px solid #eee;
}
.res-item:last-child {
border-bottom: none;
}
.res-val {
font-weight: bold;
color: #2c3e50;
}
.cal-article {
margin-top: 40px;
line-height: 1.6;
color: #444;
}
.cal-article h2 {
color: #2c3e50;
margin-top: 25px;
}
@media (max-width: 600px) {
.cal-grid {
grid-template-columns: 1fr;
}
.cal-btn {
grid-column: 1;
}
}

Calculate the total nutritional value of your meal based on weight and macronutrient density.

How to Use the Food Calorie Calculator

Understanding exactly what you are eating is the first step toward achieving your fitness goals, whether that is weight loss, muscle gain, or maintenance. This calculator helps you determine the total caloric and macronutrient breakdown of a specific food portion based on its nutritional facts per 100 grams.

To use this tool, locate the “Nutrition Facts” label on your food packaging or look up the raw ingredient’s density in a database. Enter the protein, carbohydrate, and fat values listed for a 100g serving, then enter the actual weight of the portion you plan to eat.

The Science of Calorie Calculation

The total energy content of food is derived from its macronutrients. Each macro provides a specific amount of energy per gram:

• Protein: 4 calories per gram.
• Carbohydrates: 4 calories per gram.
• Fats: 9 calories per gram.

By calculating the weight of each macro in your specific portion and multiplying by these values, we can determine the precise energy density of your meal.

Real-World Example

Imagine you are eating a 150g serving of Cooked Chicken Breast. The standard values per 100g are approximately 31g Protein, 0g Carbs, and 3.6g Fat.

• Weight: 150g
• Protein Calculation: (31 / 100) * 150 = 46.5g Protein
• Fat Calculation: (3.6 / 100) * 150 = 5.4g Fat
• Calorie Calculation: (46.5 * 4) + (0 * 4) + (5.4 * 9) = 234.6 Calories

Why Tracking Food Calories Matters

Tracking calories isn’t just about restriction; it’s about awareness. Many “healthy” foods can be high in hidden fats or sugars that increase the calorie count significantly. By using a precise calculator, you can ensure that your portion sizes align with your metabolic needs and daily energy expenditure.

function calculateFoodCalories() {
var weight = parseFloat(document.getElementById(‘portionWeight’).value);
var p100 = parseFloat(document.getElementById(‘protein100’).value);
var c100 = parseFloat(document.getElementById(‘carbs100’).value);
var f100 = parseFloat(document.getElementById(‘fat100’).value);
if (isNaN(weight) || isNaN(p100) || isNaN(c100) || isNaN(f100)) {
alert(“Please enter valid numbers for all fields.”);
return;
}
// Calculate actual grams for the given portion
var totalProtein = (p100 / 100) * weight;
var totalCarbs = (c100 / 100) * weight;
var totalFat = (f100 / 100) * weight;
// Calculate total calories based on Atwater factors
// 4 kcal/g for Protein and Carbs, 9 kcal/g for Fat
var totalCals = (totalProtein * 4) + (totalCarbs * 4) + (totalFat * 9);
// Display results
document.getElementById(‘resCalories’).innerText = totalCals.toFixed(1) + ” kcal”;
document.getElementById(‘resProtein’).innerText = totalProtein.toFixed(1) + ” g”;
document.getElementById(‘resCarbs’).innerText = totalCarbs.toFixed(1) + ” g”;
document.getElementById(‘resFat’).innerText = totalFat.toFixed(1) + ” g”;
// Show the result area
document.getElementById(‘resultArea’).style.display = ‘block’;
}