Nutrition Facts Label Calculator
Use this calculator to generate per-serving nutrition information for your recipes, similar to what you'd find on a standard nutrition facts label. Enter the total nutritional values for your entire recipe, and then specify how many servings your recipe yields. The calculator will then determine the nutrition per serving and the % Daily Value based on a 2,000 calorie diet.
.calculator-container {
font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
background-color: #f9f9f9;
padding: 20px;
border-radius: 8px;
box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
max-width: 700px;
margin: 20px auto;
border: 1px solid #ddd;
}
.calculator-container h2 {
color: #333;
text-align: center;
margin-bottom: 20px;
font-size: 1.8em;
}
.calculator-container h3 {
color: #555;
margin-top: 25px;
margin-bottom: 15px;
font-size: 1.3em;
}
.calculator-container p {
color: #666;
line-height: 1.6;
margin-bottom: 15px;
}
.calculator-form .form-group {
margin-bottom: 15px;
display: flex;
flex-wrap: wrap;
align-items: center;
justify-content: space-between;
}
.calculator-form label {
flex: 1;
min-width: 200px;
margin-right: 10px;
color: #444;
font-weight: bold;
}
.calculator-form input[type="number"] {
flex: 2;
min-width: 120px;
padding: 10px;
border: 1px solid #ccc;
border-radius: 4px;
box-sizing: border-box;
font-size: 1em;
}
.calculator-form button {
display: block;
width: 100%;
padding: 12px 20px;
background-color: #007bff;
color: white;
border: none;
border-radius: 4px;
font-size: 1.1em;
cursor: pointer;
margin-top: 20px;
transition: background-color 0.3s ease;
}
.calculator-form button:hover {
background-color: #0056b3;
}
.calculator-result {
margin-top: 30px;
padding: 20px;
background-color: #e9f7ef;
border: 1px solid #d4edda;
border-radius: 8px;
color: #155724;
font-size: 1.1em;
line-height: 1.8;
}
.nutrition-label {
border: 2px solid black;
padding: 10px;
width: 300px;
margin: 20px auto;
background-color: white;
font-family: Arial, sans-serif;
font-size: 0.9em;
}
.nutrition-label h4 {
font-size: 2em;
margin: 0 0 5px 0;
font-weight: 900;
border-bottom: 10px solid black;
padding-bottom: 2px;
}
.nutrition-label .serving-info {
border-bottom: 1px solid black;
padding-bottom: 5px;
margin-bottom: 5px;
}
.nutrition-label .serving-info p {
margin: 0;
font-size: 0.9em;
}
.nutrition-label .calories-info {
border-bottom: 5px solid black;
padding: 5px 0;
margin-bottom: 5px;
}
.nutrition-label .calories-info p {
margin: 0;
font-size: 1.5em;
font-weight: bold;
}
.nutrition-label .daily-value-header {
text-align: right;
font-weight: bold;
margin-bottom: 5px;
}
.nutrition-label .nutrient-row {
display: flex;
justify-content: space-between;
border-top: 1px solid #ccc;
padding: 2px 0;
}
.nutrition-label .nutrient-row.bold {
font-weight: bold;
}
.nutrition-label .nutrient-row.indent {
margin-left: 15px;
}
.nutrition-label .nutrient-row span:first-child {
flex-grow: 1;
}
.nutrition-label .nutrient-row span:last-child {
text-align: right;
min-width: 40px;
}
.nutrition-label .footnote {
border-top: 1px solid black;
padding-top: 5px;
margin-top: 10px;
font-size: 0.7em;
}
.error-message {
color: #dc3545;
background-color: #f8d7da;
border: 1px solid #f5c6cb;
padding: 10px;
border-radius: 4px;
margin-top: 15px;
}
function calculateNutritionFacts() {
// Get input values
var totalRecipeCalories = parseFloat(document.getElementById('totalRecipeCalories').value);
var totalRecipeFat = parseFloat(document.getElementById('totalRecipeFat').value);
var totalRecipeSaturatedFat = parseFloat(document.getElementById('totalRecipeSaturatedFat').value);
var totalRecipeTransFat = parseFloat(document.getElementById('totalRecipeTransFat').value);
var totalRecipeCholesterol = parseFloat(document.getElementById('totalRecipeCholesterol').value);
var totalRecipeSodium = parseFloat(document.getElementById('totalRecipeSodium').value);
var totalRecipeCarbohydrates = parseFloat(document.getElementById('totalRecipeCarbohydrates').value);
var totalRecipeDietaryFiber = parseFloat(document.getElementById('totalRecipeDietaryFiber').value);
var totalRecipeSugars = parseFloat(document.getElementById('totalRecipeSugars').value);
var totalRecipeAddedSugars = parseFloat(document.getElementById('totalRecipeAddedSugars').value);
var totalRecipeProtein = parseFloat(document.getElementById('totalRecipeProtein').value);
var totalRecipeVitaminD = parseFloat(document.getElementById('totalRecipeVitaminD').value);
var totalRecipeCalcium = parseFloat(document.getElementById('totalRecipeCalcium').value);
var totalRecipeIron = parseFloat(document.getElementById('totalRecipeIron').value);
var totalRecipePotassium = parseFloat(document.getElementById('totalRecipePotassium').value);
var numberOfServings = parseFloat(document.getElementById('numberOfServings').value);
var resultDiv = document.getElementById('nutritionResult');
resultDiv.innerHTML = "; // Clear previous results
// Validate inputs
if (isNaN(totalRecipeCalories) || isNaN(totalRecipeFat) || isNaN(totalRecipeSaturatedFat) || isNaN(totalRecipeTransFat) ||
isNaN(totalRecipeCholesterol) || isNaN(totalRecipeSodium) || isNaN(totalRecipeCarbohydrates) ||
isNaN(totalRecipeDietaryFiber) || isNaN(totalRecipeSugars) || isNaN(totalRecipeAddedSugars) ||
isNaN(totalRecipeProtein) || isNaN(totalRecipeVitaminD) || isNaN(totalRecipeCalcium) ||
isNaN(totalRecipeIron) || isNaN(totalRecipePotassium) || isNaN(numberOfServings)) {
resultDiv.innerHTML = 'Please enter valid numbers for all nutritional values and servings.';
return;
}
if (numberOfServings <= 0) {
resultDiv.innerHTML = 'Number of servings must be greater than zero.';
return;
}
// Daily Values (FDA 2020, based on 2,000 calorie diet)
var DV_FAT = 78; // g
var DV_SAT_FAT = 20; // g
var DV_CHOL = 300; // mg
var DV_SODIUM = 2300; // mg
var DV_CARB = 275; // g
var DV_FIBER = 28; // g
var DV_ADDED_SUGARS = 50; // g
var DV_PROTEIN = 50; // g
var DV_VIT_D = 20; // mcg
var DV_CALCIUM = 1300; // mg
var DV_IRON = 18; // mg
var DV_POTASSIUM = 4700; // mg
// Calculate per-serving values
var perServingCalories = totalRecipeCalories / numberOfServings;
var perServingFat = totalRecipeFat / numberOfServings;
var perServingSaturatedFat = totalRecipeSaturatedFat / numberOfServings;
var perServingTransFat = totalRecipeTransFat / numberOfServings;
var perServingCholesterol = totalRecipeCholesterol / numberOfServings;
var perServingSodium = totalRecipeSodium / numberOfServings;
var perServingCarbohydrates = totalRecipeCarbohydrates / numberOfServings;
var perServingDietaryFiber = totalRecipeDietaryFiber / numberOfServings;
var perServingSugars = totalRecipeSugars / numberOfServings;
var perServingAddedSugars = totalRecipeAddedSugars / numberOfServings;
var perServingProtein = totalRecipeProtein / numberOfServings;
var perServingVitaminD = totalRecipeVitaminD / numberOfServings;
var perServingCalcium = totalRecipeCalcium / numberOfServings;
var perServingIron = totalRecipeIron / numberOfServings;
var perServingPotassium = totalRecipePotassium / numberOfServings;
// Helper function for rounding based on FDA guidelines (simplified)
function roundNutrient(value, type) {
if (value < 0) value = 0; // Ensure no negative values
if (type === 'calories') {
if (value 50, nearest 5 for 5-50. Simplified to nearest 10 for >5.
} else if (type === 'fat' || type === 'carb' || type === 'protein' || type === 'fiber' || type === 'sugars') {
if (value < 0.5) return 0;
return Math.round(value * 10) / 10; // One decimal place
} else if (type === 'cholesterol' || type === 'sodium' || type === 'calcium' || type === 'potassium') {
if (value < 5) return 0;
return Math.round(value); // Nearest whole number
} else if (type === 'iron' || type === 'vitaminD') { // Iron and Vitamin D can have decimals
if (value < 0.5 && type === 'vitaminD') return 0; // For Vitamin D, if <0.5mcg, show 0
if (value < 0.5 && type === 'iron') return 0; // For Iron, if <0.5mg, show 0
return Math.round(value * 10) / 10; // One decimal place
}
return value;
}
function calculateDV(nutrientValue, dailyValue) {
if (dailyValue === 0) return 0; // Avoid division by zero
var dv = (nutrientValue / dailyValue) * 100;
if (dv < 1) return 0; // If less than 1%, show 0%
return Math.round(dv); // Round to nearest whole percent
}
// Rounded per-serving values
var displayCalories = roundNutrient(perServingCalories, 'calories');
var displayFat = roundNutrient(perServingFat, 'fat');
var displaySaturatedFat = roundNutrient(perServingSaturatedFat, 'fat');
var displayTransFat = roundNutrient(perServingTransFat, 'fat');
var displayCholesterol = roundNutrient(perServingCholesterol, 'cholesterol');
var displaySodium = roundNutrient(perServingSodium, 'sodium');
var displayCarbohydrates = roundNutrient(perServingCarbohydrates, 'carb');
var displayDietaryFiber = roundNutrient(perServingDietaryFiber, 'fiber');
var displaySugars = roundNutrient(perServingSugars, 'sugars');
var displayAddedSugars = roundNutrient(perServingAddedSugars, 'sugars');
var displayProtein = roundNutrient(perServingProtein, 'protein');
var displayVitaminD = roundNutrient(perServingVitaminD, 'vitaminD');
var displayCalcium = roundNutrient(perServingCalcium, 'calcium');
var displayIron = roundNutrient(perServingIron, 'iron');
var displayPotassium = roundNutrient(perServingPotassium, 'potassium');
// Calculate % Daily Value
var dvFat = calculateDV(perServingFat, DV_FAT);
var dvSaturatedFat = calculateDV(perServingSaturatedFat, DV_SAT_FAT);
var dvCholesterol = calculateDV(perServingCholesterol, DV_CHOL);
var dvSodium = calculateDV(perServingSodium, DV_SODIUM);
var dvCarbohydrates = calculateDV(perServingCarbohydrates, DV_CARB);
var dvDietaryFiber = calculateDV(perServingDietaryFiber, DV_FIBER);
var dvAddedSugars = calculateDV(perServingAddedSugars, DV_ADDED_SUGARS);
var dvProtein = calculateDV(perServingProtein, DV_PROTEIN);
var dvVitaminD = calculateDV(perServingVitaminD, DV_VIT_D);
var dvCalcium = calculateDV(perServingCalcium, DV_CALCIUM);
var dvIron = calculateDV(perServingIron, DV_IRON);
var dvPotassium = calculateDV(perServingPotassium, DV_POTASSIUM);
// Build the nutrition label HTML
var outputHTML = `
Nutrition Facts
Serving Size 1 Serving
Servings Per Container ${Math.round(numberOfServings)}
Calories ${displayCalories}
Total Fat ${displayFat}g
${dvFat}%
Saturated Fat ${displaySaturatedFat}g
${dvSaturatedFat}%
Trans Fat ${displayTransFat}g
Cholesterol ${displayCholesterol}mg
${dvCholesterol}%
Sodium ${displaySodium}mg
${dvSodium}%
Total Carbohydrate ${displayCarbohydrates}g
${dvCarbohydrates}%
Dietary Fiber ${displayDietaryFiber}g
${dvDietaryFiber}%
Total Sugars ${displaySugars}g
Includes ${displayAddedSugars}g Added Sugars
${dvAddedSugars}%
Protein ${displayProtein}g
${dvProtein}%
Vitamin D ${displayVitaminD}mcg
${dvVitaminD}%
Calcium ${displayCalcium}mg
${dvCalcium}%
Iron ${displayIron}mg
${dvIron}%
Potassium ${displayPotassium}mg
${dvPotassium}%
`;
resultDiv.innerHTML = outputHTML;
}
Understanding and Calculating Your Nutrition Facts Label
The Nutrition Facts label is a standardized panel found on packaged foods in many countries, providing essential information about the nutrient content of a serving. It's a crucial tool for consumers to make informed dietary choices and for food producers to comply with regulations.
Why is a Nutrition Facts Label Important?
- Informed Choices: Helps consumers understand what they are eating, allowing them to manage calorie intake, track macronutrients (fats, carbs, protein), and monitor micronutrients (vitamins, minerals).
- Dietary Management: Essential for individuals with specific dietary needs, allergies, or health conditions (e.g., diabetes, high blood pressure) to control intake of sugars, sodium, or allergens.
- Regulatory Compliance: Food manufacturers are legally required to provide accurate nutrition information to ensure public health and prevent misleading claims.
- Recipe Development: For home cooks and small businesses, calculating nutrition facts helps in creating balanced recipes and understanding their nutritional impact.
How to Use This Calculator
This calculator simplifies the process of generating a nutrition facts label for your recipes. Instead of analyzing each ingredient individually, you'll input the total nutritional values for your entire recipe. This means you would typically sum up the nutrient content of all ingredients in your recipe using a food database or specialized software beforehand.
- Gather Total Recipe Nutrients: Before using the calculator, you need to determine the total amount of each nutrient (Calories, Fat, Sodium, etc.) present in your entire recipe. This is usually done by looking up the nutritional data for each ingredient and multiplying by its quantity, then summing the totals.
- Enter Total Values: Input these summed total values into the corresponding fields in the calculator. If a nutrient is not present in your recipe, enter '0'.
- Specify Servings: Enter the total number of servings your recipe yields. This is critical for the calculator to determine the "per serving" values.
- Calculate: Click the "Calculate Nutrition Facts" button.
Understanding the Output
The calculator will generate a simulated Nutrition Facts label, displaying the following per-serving information:
- Serving Size: The amount of food typically consumed in one sitting. Our calculator assumes "1 Serving" based on your input.
- Servings Per Container: The total number of servings your recipe yields.
- Calories: The total energy provided by one serving.
- Total Fat, Saturated Fat, Trans Fat: Different types of fats. Trans fat is often 0g.
- Cholesterol: A waxy, fat-like substance found in all cells of the body.
- Sodium: A mineral found in many foods, often associated with salt.
- Total Carbohydrate, Dietary Fiber, Total Sugars, Added Sugars: Carbohydrates are the body's main source of energy. Fiber is beneficial for digestion. Total sugars include naturally occurring and added sugars. Added sugars are those put into food during processing.
- Protein: Essential for building and repairing tissues.
- Vitamin D, Calcium, Iron, Potassium: Key vitamins and minerals.
- % Daily Value (%DV): This percentage indicates how much a nutrient in one serving contributes to a total daily diet. It's based on a standard 2,000-calorie diet, which is used for general nutrition advice. A %DV of 5% or less is considered low, while 20% or more is considered high.
Tips for Accurate Nutrition Labeling
- Use Reliable Data: When summing up ingredient nutrients, use reputable food databases (e.g., USDA FoodData Central) or nutrition analysis software.
- Be Precise with Measurements: Accurate ingredient weights and volumes are crucial for precise calculations.
- Account for Cooking Losses/Gains: Some nutrients (like water) change during cooking. For a professional label, these factors are considered. For a simple calculator, we assume pre-cooked values.
- Consider Ingredient Variations: Nutritional content can vary slightly between brands or types of ingredients.
This calculator provides a helpful estimate for your recipes. For official or commercial nutrition labels, it's recommended to consult with a certified food scientist or use professional nutrition analysis software to ensure full compliance with regulatory standards.