Fat Intake Calculator to Lose Weight

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Fat Intake Calculator for Weight Loss

Calculate Your Daily Fat Intake Target

This is your target daily calorie intake for weight loss.
Typically between 20% and 35% for weight loss.
9 (Standard) – Recommended 8.8 (Slightly lower, for precision) Fat contains approximately 9 calories per gram.
Results copied successfully!

Your Daily Fat Macronutrient Targets

— g
Formula: (Total Daily Calories * Desired Fat Percentage / 100) / Calories per Gram of Fat = Grams of Fat

Fat Calories

— kcal

Protein/Carbs Calories

— kcal

Fat % of Total

— %

Calorie Breakdown Visualization

Daily calorie distribution between fat and non-fat sources.

Example Fat Intake Scenarios

Scenario Total Calories Fat Percentage Daily Fat (grams) Fat Calories (kcal)
Weight Loss Goal A 1800 25%
Weight Loss Goal B 2200 30%
Higher Fat Approach 1900 35%
Illustrative daily fat intake targets based on different calorie and percentage goals.

Fat Intake Calculator for Weight Loss: Your Guide to Macronutrient Balance

Achieving sustainable weight loss requires a strategic approach, and understanding macronutrient distribution is crucial. While carbohydrates and proteins play vital roles, managing your fat intake is a cornerstone of many successful weight loss plans. This fat intake calculator for weight loss is designed to help you pinpoint your optimal daily fat target, ensuring you meet your goals without compromising your health or energy levels. This guide delves into why fat intake matters for weight loss, how to calculate it, and how to interpret the results effectively.

What is Fat Intake for Weight Loss?

Fat intake for weight loss refers to the strategic management of dietary fat consumption as a component of a calorie-controlled diet aimed at reducing body weight. Fat is an essential macronutrient, providing energy, supporting hormone production, and aiding in nutrient absorption. However, it is also the most calorie-dense macronutrient, with 9 calories per gram compared to 4 calories per gram for carbohydrates and proteins. For weight loss, the focus isn't on eliminating fat but on moderating its intake to create a calorie deficit while ensuring adequate nutrition and satiety.

This calculator helps individuals determine a specific gram target for daily fat consumption, aligning with their overall calorie goals for weight loss. It's a tool for precision, moving beyond general advice to personalized macronutrient planning.

Who Should Use This Fat Intake Calculator?

  • Individuals actively trying to lose weight through dietary changes.
  • People following low-carb, ketogenic, or balanced macronutrient diets.
  • Those seeking to understand their fat intake more precisely for better metabolic health.
  • Fitness enthusiasts and athletes looking to optimize body composition.

Common Misconceptions About Fat Intake for Weight Loss

  • Myth: All fats are bad for weight loss. Reality: Healthy fats (unsaturated) are essential and can even aid satiety, helping control overall calorie intake.
  • Myth: You must eat a very low-fat diet to lose weight. Reality: While fat is calorie-dense, moderate intake of healthy fats is sustainable and necessary. The overall calorie deficit is key.
  • Myth: Fat makes you fat directly. Reality: Weight gain occurs when calorie intake exceeds calorie expenditure, regardless of the source. However, the high calorie density of fat makes it easier to overconsume if not managed.

Fat Intake Calculator Formula and Mathematical Explanation

The core of this fat intake calculator for weight loss relies on a straightforward, multi-step calculation to convert your calorie goals and desired fat percentage into a tangible daily gram target for fat. Here's the breakdown:

Step 1: Calculate Total Calories from Fat

First, we determine how many calories should come from fat based on your total daily calorie intake and the desired percentage of fat.

Fat Calories = Total Daily Calorie Intake × (Desired Fat Percentage / 100)

Step 2: Convert Fat Calories to Grams

Next, we convert these fat calories into grams using the standard caloric value of fat.

Grams of Fat = Fat Calories / Calories per Gram of Fat

Combining these gives the final formula:

Grams of Fat = (Total Daily Calorie Intake × (Desired Fat Percentage / 100)) / Calories per Gram of Fat

Variable Explanations

Variable Meaning Unit Typical Range / Value
Total Daily Calorie Intake The target number of calories you aim to consume each day to achieve a calorie deficit for weight loss. kcal 1200 – 2500+ (Varies greatly)
Desired Fat Percentage The percentage of your total daily calories that you intend to derive from dietary fat. % 20% – 35% (Common for weight loss)
Calories per Gram of Fat The energy content of one gram of fat. This is a physiological constant. kcal/g 9 (Standard)
Fat Calories The calculated number of calories from fat within your total daily calorie target. kcal Derived
Grams of Fat The final calculated daily target for fat consumption in grams. g Derived
Non-Fat Calories Calories from protein and carbohydrates. kcal Total Calories – Fat Calories
Actual Fat Percentage The calculated percentage of fat based on the final gram target and total calories. % Should be close to Desired Fat Percentage

Practical Examples of Fat Intake Calculation

Let's illustrate how the fat intake calculator for weight loss works with a couple of realistic scenarios:

Example 1: Moderate Weight Loss Goal

Sarah aims to lose weight and has set her daily calorie target at 1800 kcal. She wants fat to constitute 30% of her total intake.

  • Total Daily Calorie Intake: 1800 kcal
  • Desired Fat Percentage: 30%
  • Calories per Gram of Fat: 9 kcal/g

Calculation:

  • Fat Calories = 1800 kcal * (30 / 100) = 540 kcal
  • Grams of Fat = 540 kcal / 9 kcal/g = 60 g
  • Non-Fat Calories = 1800 kcal – 540 kcal = 1260 kcal
  • Actual Fat Percentage = (540 kcal / 1800 kcal) * 100 = 30%

Result Interpretation: Sarah should aim for approximately 60 grams of fat per day to meet her 1800 kcal goal with 30% fat intake. This leaves 1260 kcal for protein and carbohydrates.

Example 2: Higher Calorie, Lower Fat Approach

Mark is also trying to lose weight but needs a higher calorie intake of 2200 kcal. He prefers a slightly lower fat percentage, aiming for 25%.

  • Total Daily Calorie Intake: 2200 kcal
  • Desired Fat Percentage: 25%
  • Calories per Gram of Fat: 9 kcal/g

Calculation:

  • Fat Calories = 2200 kcal * (25 / 100) = 550 kcal
  • Grams of Fat = 550 kcal / 9 kcal/g = 61.1 g (approx.)
  • Non-Fat Calories = 2200 kcal – 550 kcal = 1650 kcal
  • Actual Fat Percentage = (550 kcal / 2200 kcal) * 100 = 25%

Result Interpretation: Mark's target is about 61 grams of fat per day within his 2200 kcal budget. This approach allocates more calories to protein and carbohydrates, which might be preferable for energy levels or muscle maintenance.

How to Use This Fat Intake Calculator

Using the fat intake calculator for weight loss is simple and intuitive. Follow these steps to get your personalized daily fat target:

Step-by-Step Instructions:

  1. Enter Total Daily Calorie Intake: Input the total number of calories you've determined is appropriate for your weight loss goals. This is often based on your Basal Metabolic Rate (BMR), Total Daily Energy Expenditure (TDEE), and a chosen calorie deficit.
  2. Set Desired Fat Percentage: Enter the percentage of your total calories you want to come from fat. A common range for weight loss is 20-35%. Consider your dietary preferences and any specific nutritional advice you're following.
  3. Select Calories per Gram of Fat: For most individuals, the standard value of 9 kcal/g is accurate. You can leave this as the default unless you have specific guidance otherwise.
  4. Click 'Calculate Fat Intake': The calculator will instantly process your inputs.

Reading Your Results:

  • Primary Result (Grams of Fat): This is your main target – the total grams of fat you should aim to consume daily.
  • Intermediate Values:
    • Fat Calories: The number of calories derived from your target fat intake.
    • Protein/Carbs Calories: The remaining calories available for protein and carbohydrates.
    • Actual Fat Percentage: A check to ensure the calculated grams align precisely with your desired percentage.
  • Visualization: The chart provides a visual representation of how your calories are distributed between fat and non-fat sources.
  • Example Scenarios: The table offers quick insights into how different calorie and fat percentage choices impact daily fat targets.

Decision-Making Guidance:

Use the calculated grams of fat as a guideline within your overall meal planning. Focus on incorporating healthy fat sources like avocados, nuts, seeds, olive oil, and fatty fish. Distribute your fat intake throughout the day to help with satiety. If the calculated grams seem too restrictive or too high for your preferences, adjust your total calorie intake or the desired fat percentage and recalculate. Remember that consistency is key for weight loss.

Key Factors Affecting Your Fat Intake Target

While the calculator provides a precise number, several real-world factors influence your weight loss journey and the effectiveness of your fat intake target:

  1. Total Calorie Deficit: The most critical factor for weight loss is consuming fewer calories than you burn. Your calorie target dictates the potential grams of fat. A larger deficit might necessitate adjustments to all macronutrients.
  2. Individual Metabolism (BMR/TDEE): Your Basal Metabolic Rate (BMR) and Total Daily Energy Expenditure (TDEE) are unique. The accuracy of your "Total Daily Calorie Intake" input significantly impacts the relevance of the calculated fat target.
  3. Activity Level: Higher activity levels require more calories. If your calorie goal doesn't accurately reflect your exercise, your fat intake might be misaligned. Consider using a reliable TDEE calculator for a more accurate baseline.
  4. Macronutrient Ratios for Protein and Carbs: While this calculator focuses on fat, the remaining calories are for protein and carbs. Ensuring adequate protein is vital for muscle preservation during weight loss, and carbohydrate intake affects energy levels.
  5. Dietary Preferences and Sustainability: A fat intake target that doesn't align with your food preferences or lifestyle is unlikely to be sustainable long-term. Choose percentages that allow for enjoyable, healthy meals.
  6. Hormonal Factors and Health Conditions: Certain health conditions (e.g., thyroid issues, PCOS) or hormonal fluctuations can affect metabolism and nutrient needs. Consult a healthcare professional for personalized advice.
  7. Micronutrient Intake: While focusing on macros, don't neglect vitamins and minerals. Ensure your diet includes a variety of nutrient-dense foods.
  8. Quality of Fats: Prioritize unsaturated fats (mono- and polyunsaturated) over saturated and trans fats. The calculator provides grams, but the *type* of fat matters for overall health.

Frequently Asked Questions (FAQ)

Q1: What is a healthy fat percentage for weight loss?

A: For most individuals, a fat percentage between 20% and 35% of total daily calories is considered healthy and effective for weight loss. Lower percentages may be sustainable for some, while others find higher (but still healthy) fats more satiating.

Q2: Can I eat more fat if I exercise more?

A: Yes. If you increase your activity level, your total daily calorie needs increase. You can then allocate a portion of those additional calories to fat, provided it aligns with your desired fat percentage and overall weight loss goals. Ensure your total calorie intake still supports a deficit.

Q3: Does the type of fat matter for weight loss?

A: Absolutely. While all fats are calorie-dense, healthy unsaturated fats (found in avocados, nuts, seeds, olive oil, fish) are beneficial for overall health, hormone function, and satiety. Limit saturated and avoid trans fats.

Q4: What if my calculated fat intake feels too low?

A: This could mean your total calorie target is quite low, or you're aiming for a very low fat percentage. Consider if your calorie goal is appropriate. Alternatively, you could slightly increase the fat percentage (e.g., from 25% to 30%) if it allows for a more sustainable and satisfying diet, while ensuring overall calorie deficit.

Q5: How do I track my fat intake accurately?

A: Use a reliable nutrition tracking app or journal. Weighing food portions, especially those higher in fat (like oils, nuts, cheese), provides the most accurate results. Pay attention to serving sizes listed on food labels.

Q6: Is it possible to eat too little fat?

A: Yes. Consuming too little fat can lead to hormonal imbalances, deficiencies in fat-soluble vitamins (A, D, E, K), and impact satiety, potentially leading to overeating other foods. Aim for a balanced intake within recommended ranges.

Q7: Should I use the 9 kcal/g or a slightly different value?

A: The 9 kcal/g value is a widely accepted average. Actual caloric content can vary slightly due to the specific fatty acid composition. For general weight loss calculations, 9 kcal/g is perfectly adequate and recommended for simplicity.

Q8: How does this calculator relate to protein and carbohydrate intake?

A: This calculator isolates fat. The remaining calories in your daily target are for protein and carbohydrates. You'll need to plan those macros separately based on your goals (e.g., prioritizing protein for muscle retention).

Related Tools and Internal Resources

To further support your weight loss and health journey, explore these related tools and resources:

var totalCaloriesInput = document.getElementById("totalCalories"); var fatPercentageInput = document.getElementById("fatPercentage"); var gramsPerCalorieFatInput = document.getElementById("gramsPerCalorieFat"); var resultsContainer = document.getElementById("resultsContainer"); var gramsOfFatResult = document.getElementById("gramsOfFatResult"); var fatCaloriesResult = document.getElementById("fatCaloriesResult"); var nonFatCaloriesResult = document.getElementById("nonFatCaloriesResult"); var actualFatPercentageResult = document.getElementById("actualFatPercentageResult"); var copyMessage = document.getElementById("copyMessage"); // Example Table Elements var exampleTableFatA = document.getElementById("exampleTableFatA"); var exampleTableFatCaloriesA = document.getElementById("exampleTableFatCaloriesA"); var exampleTableFatB = document.getElementById("exampleTableFatB"); var exampleTableFatCaloriesB = document.getElementById("exampleTableFatCaloriesB"); var exampleTableFatC = document.getElementById("exampleTableFatC"); var exampleTableFatCaloriesC = document.getElementById("exampleTableFatCaloriesC"); // Error message elements var errorTotalCalories = document.getElementById("error-totalCalories"); var errorFatPercentage = document.getElementById("error-fatPercentage"); var chart; var chartCtx; function validateInput(value, id, min, max, message) { var errorElement = document.getElementById("error-" + id); errorElement.style.display = "none"; // Hide previous error if (value === "") { errorElement.textContent = "This field cannot be empty."; errorElement.style.display = "block"; return false; } var numValue = parseFloat(value); if (isNaN(numValue)) { errorElement.textContent = "Please enter a valid number."; errorElement.style.display = "block"; return false; } if (numValue max) { errorElement.textContent = message || `Value cannot exceed ${max}.`; errorElement.style.display = "block"; return false; } return true; } function calculateFatIntake() { var totalCalories = parseFloat(totalCaloriesInput.value); var fatPercentage = parseFloat(fatPercentageInput.value); var gramsPerCalorieFat = parseFloat(gramsPerCalorieFatInput.value); // Client-side validation var isValidTotalCalories = validateInput(totalCaloriesInput.value, "totalCalories", 1, 5000, "Calories must be between 1 and 5000."); var isValidFatPercentage = validateInput(fatPercentageInput.value, "fatPercentage", 1, 99, "Percentage must be between 1% and 99%."); if (!isValidTotalCalories || !isValidFatPercentage) { resultsContainer.style.display = "none"; return; } var fatCalories = (totalCalories * (fatPercentage / 100)); var gramsOfFat = (fatCalories / gramsPerCalorieFat); var nonFatCalories = totalCalories – fatCalories; var actualFatPercentage = (fatCalories / totalCalories) * 100; // Format results gramsOfFatResult.textContent = gramsOfFat.toFixed(1) + " g"; fatCaloriesResult.textContent = fatCalories.toFixed(0) + " kcal"; nonFatCaloriesResult.textContent = nonFatCalories.toFixed(0) + " kcal"; actualFatPercentageResult.textContent = actualFatPercentage.toFixed(1) + " %"; resultsContainer.style.display = "block"; updateChart(totalCalories, fatCalories, nonFatCalories); updateExampleTable(totalCalories, fatPercentage); } function resetCalculator() { totalCaloriesInput.value = "2000"; fatPercentageInput.value = "30"; gramsPerCalorieFatInput.value = "9"; // Clear errors errorTotalCalories.style.display = "none"; errorFatPercentage.style.display = "none"; resultsContainer.style.display = "none"; copyMessage.style.display = "none"; calculateFatIntake(); // Recalculate with default values } function copyResults() { var resultsText = "— Fat Intake Calculation Results —\n\n"; resultsText += "Primary Result:\n"; resultsText += "Grams of Fat: " + gramsOfFatResult.textContent + "\n"; resultsText += "Fat Calories: " + fatCaloriesResult.textContent + "\n"; resultsText += "Protein/Carbs Calories: " + nonFatCaloriesResult.textContent + "\n"; resultsText += "Actual Fat Percentage: " + actualFatPercentageResult.textContent + "\n\n"; resultsText += "Assumptions:\n"; resultsText += "Total Daily Calories: " + totalCaloriesInput.value + " kcal\n"; resultsText += "Desired Fat Percentage: " + fatPercentageInput.value + "%\n"; resultsText += "Calories per Gram of Fat: " + gramsPerCalorieFatInput.value + " kcal/g\n"; try { navigator.clipboard.writeText(resultsText).then(function() { copyMessage.style.display = "block"; setTimeout(function() { copyMessage.style.display = "none"; }, 3000); }); } catch (err) { console.error("Failed to copy text: ", err); // Fallback for older browsers or environments where clipboard API is restricted alert("Could not copy results. Please manually select and copy the text above."); } } function updateChart(totalCalories, fatCalories, nonFatCalories) { if (!chart) { chartCtx = document.getElementById("calorieBreakdownChart").getContext("2d"); chart = new Chart(chartCtx, { type: 'pie', data: { labels: ['Fat Calories', 'Non-Fat Calories (Protein/Carbs)'], datasets: [{ data: [fatCalories, nonFatCalories], backgroundColor: [ '#004a99', // Primary color for Fat '#6c757d' // Secondary color for Non-Fat ], borderColor: '#ffffff', borderWidth: 2 }] }, options: { responsive: true, maintainAspectRatio: false, plugins: { legend: { position: 'bottom', }, title: { display: true, text: 'Daily Calorie Distribution', font: { size: 16 } } } } }); } else { chart.data.datasets[0].data = [fatCalories, nonFatCalories]; chart.update(); } } function updateExampleTable(currentTotalCalories, currentFatPercentage) { // Example A: Weight Loss Goal A (lower calories, moderate fat) var exACalories = 1800; var exAFatPerc = 25; var exAFatCal = exACalories * (exAFatPerc / 100); var exAFatGrams = exAFatCal / 9; exampleTableFatA.textContent = exAFatGrams.toFixed(1) + " g"; exampleTableFatCaloriesA.textContent = exAFatCal.toFixed(0) + " kcal"; // Example B: Weight Loss Goal B (higher calories, moderate fat) var exBCalories = 2200; var exBFatPerc = 30; var exBFatCal = exBCalories * (exBFatPerc / 100); var exBFatGrams = exBFatCal / 9; exampleTableFatB.textContent = exBFatGrams.toFixed(1) + " g"; exampleTableFatCaloriesB.textContent = exBFatCal.toFixed(0) + " kcal"; // Example C: Higher Fat Approach var exCCalories = 1900; var exCFatPerc = 35; var exCFatCal = exCCalories * (exCFatPerc / 100); var exCFatGrams = exCFatCal / 9; exampleTableFatC.textContent = exCFatGrams.toFixed(1) + " g"; exampleTableFatCaloriesC.textContent = exCFatCal.toFixed(0) + " kcal"; } // Initial calculation and chart setup on page load document.addEventListener('DOMContentLoaded', function() { // Load Chart.js from CDN – IMPORTANT: For a production environment, consider hosting locally or using a robust CDN. // This script assumes Chart.js is available. If not, the chart won't render. // For this specific output, we are embedding the calculator logic and HTML, but the chart library is external. // In a real scenario, you'd need to include the Chart.js library. // Example: // For this exercise, we'll assume it's loaded or simulate its absence gracefully. if (typeof Chart === 'undefined') { console.warn("Chart.js library not found. Chart will not render."); // Optionally disable chart section or show a message document.querySelector('.chart-container').innerHTML = '

Chart Unavailable

Please ensure Chart.js library is loaded to view the visualization.

'; } else { updateChart(parseFloat(totalCaloriesInput.value), 0, 0); // Initialize chart with dummy data calculateFatIntake(); // Perform initial calculation updateExampleTable(); // Populate example table on load } // Add event listeners for real-time updates totalCaloriesInput.addEventListener('input', calculateFatIntake); fatPercentageInput.addEventListener('input', calculateFatIntake); gramsPerCalorieFatInput.addEventListener('change', calculateFatIntake); // 'change' for select // Add focus/blur for clearer visual feedback on inputs var inputs = document.querySelectorAll('.input-group input[type="number"], .input-group select'); inputs.forEach(function(input) { input.addEventListener('focus', function() { this.style.borderColor = '#004a99'; this.style.boxShadow = '0 0 0 2px rgba(0, 74, 153, 0.2)'; }); input.addEventListener('blur', function() { this.style.borderColor = '#ccc'; this.style.boxShadow = 'none'; // Trigger recalculation on blur to catch final value after interaction calculateFatIntake(); }); }); });

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