Carb Protein Fat Ratio for Weight Loss Female Calculator

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Carb Protein Fat Ratio for Weight Loss Female Calculator

Your Personalized Macronutrient Guide for Effective Female Weight Loss

Calculate Your Macronutrient Ratio

Estimate your target daily calorie intake for weight loss.
Sedentary (little to no exercise) Lightly Active (light exercise/sports 1-3 days/week) Moderately Active (moderate exercise/sports 3-5 days/week) Very Active (hard exercise/sports 6-7 days a week) Extra Active (very hard exercise/sports & physical job) Choose the option that best describes your weekly physical activity.
This is often derived from Basal Metabolic Rate (BMR) and your activity level. You can use the activity level select or input a specific multiplier if known. Default is set by activity level.
Recommended 25-35% for muscle preservation during weight loss.
Recommended 20-35% for hormonal balance and satiety.

Your Macronutrient Breakdown

Protein: — g
Fat: — g
Carbohydrates: — g
Total Calories Used: — kcal
Calculated based on your calorie target and desired macronutrient percentages. Protein and fat are prioritized, with remaining calories allocated to carbohydrates.

Macronutrient Distribution

Macronutrient Energy Contribution
Macronutrient Percentage of Calories Grams per Day Calories from Macronutrient
Protein –% — g — kcal
Fat –% — g — kcal
Carbohydrates –% — g — kcal
Total –% — kcal

What is the Carb Protein Fat Ratio for Weight Loss Female Calculator?

The carb protein fat ratio for weight loss female calculator is a specialized tool designed to help women determine an optimal balance of macronutrients (carbohydrates, protein, and fats) to support their weight loss goals. Unlike general calculators, this tool focuses on the unique physiological considerations for females, such as hormonal balance and muscle preservation during a calorie deficit. It helps translate a daily calorie target into a practical breakdown of grams for each macronutrient, guiding dietary choices for more effective and sustainable fat loss.

Who should use it?

  • Women aiming for fat loss while preserving lean muscle mass.
  • Individuals seeking a structured approach to their diet beyond just calorie counting.
  • Those who want to understand how different food groups contribute to their overall intake.
  • Women experiencing metabolic changes or seeking to optimize their diet for hormonal health during weight loss.

Common Misconceptions:

  • All carbs are bad for weight loss: This is false. Complex carbohydrates provide energy and fiber, essential for satiety and bodily functions. The focus is on quality and quantity.
  • Higher protein is always better: While crucial, excessively high protein intake without sufficient carbs and fats can be unsustainable and may not align with optimal hormonal health for women.
  • Fat should be completely eliminated: Healthy fats are vital for hormone production, nutrient absorption, and satiety. They are essential components of a balanced diet.
  • The ratio is one-size-fits-all: Individual needs vary based on activity, metabolism, age, and health status. This calculator provides a personalized starting point.

Carb Protein Fat Ratio for Weight Loss Female Calculator Formula and Mathematical Explanation

The core principle behind this calculator is to allocate a target daily calorie intake into specific amounts of carbohydrates, protein, and fats, based on user-defined percentages. This method prioritizes protein and fat intake to support muscle mass and hormonal function, respectively, while the remainder of calories are assigned to carbohydrates.

The process involves several steps:

  1. Determine Target Calories: The user inputs their daily calorie target for weight loss. If not provided directly, it might be estimated using BMR and an activity multiplier (though this calculator uses a direct calorie input for simplicity and user control).
  2. Calculate Protein Calories: Protein is assigned a percentage of the total target calories. Since protein contains 4 calories per gram:
    Protein Calories = Daily Calorie Target * (Target Protein Percentage / 100)
  3. Calculate Fat Calories: Fat is assigned a percentage of the total target calories. Since fat contains 9 calories per gram:
    Fat Calories = Daily Calorie Target * (Target Fat Percentage / 100)
  4. Calculate Carbohydrate Calories: The remaining calories are allocated to carbohydrates. Carbohydrates also contain 4 calories per gram:
    Carbohydrate Calories = Daily Calorie Target - Protein Calories - Fat Calories
  5. Convert Calories to Grams: Finally, the total calories for each macronutrient are converted into grams:
    Protein Grams = Protein Calories / 4
    Fat Grams = Fat Calories / 9
    Carbohydrate Grams = Carbohydrate Calories / 4

The calculator ensures that the sum of the percentages for protein and fat does not exceed 100%, and importantly, that the sum of the resulting calculated calories from each macronutrient equals the initial Daily Calorie Target. The calculator also validates that the target percentages for protein and fat result in a reasonable distribution, ensuring the carbohydrate percentage is not negative or excessively high/low.

Variable Explanations

Variable Meaning Unit Typical Range
Daily Calorie Target The total number of calories to consume per day for weight loss. kcal 1200 – 2000 (Varies greatly)
Target Protein Percentage The proportion of total daily calories to be derived from protein. % 25% – 35%
Target Fat Percentage The proportion of total daily calories to be derived from fat. % 20% – 35%
Protein Calories The total calories dedicated to protein intake. kcal Calculated
Fat Calories The total calories dedicated to fat intake. kcal Calculated
Carbohydrate Calories The total calories dedicated to carbohydrate intake. kcal Calculated
Protein Grams The total grams of protein to consume daily. g Calculated
Fat Grams The total grams of fat to consume daily. g Calculated
Carbohydrate Grams The total grams of carbohydrates to consume daily. g Calculated

Practical Examples (Real-World Use Cases)

Let's illustrate with two scenarios for a female aiming for weight loss:

Example 1: Moderate Activity, Muscle Focus

Scenario: Sarah is moderately active (exercises 3-5 times a week) and wants to lose weight while preserving muscle. She has set a daily calorie target of 1800 kcal. She aims for a higher protein intake to support muscle repair and satiety.

  • Inputs:
    • Daily Calorie Target: 1800 kcal
    • Activity Level: Moderately Active (Multiplier: 1.55 – used for general context, calculator uses direct calories)
    • Target Protein Percentage: 35%
    • Target Fat Percentage: 25%
  • Calculations:
    • Protein Calories: 1800 * (35/100) = 630 kcal
    • Fat Calories: 1800 * (25/100) = 450 kcal
    • Carbohydrate Calories: 1800 – 630 – 450 = 720 kcal
    • Protein Grams: 630 / 4 = 157.5 g
    • Fat Grams: 450 / 9 = 50 g
    • Carbohydrate Grams: 720 / 4 = 180 g
  • Outputs:
    • Primary Result: 35% Protein / 25% Fat / 40% Carbs
    • Protein: 158 g
    • Fat: 50 g
    • Carbohydrates: 180 g
  • Interpretation: Sarah should aim for approximately 158g of protein, 50g of fat, and 180g of carbohydrates daily. This distribution prioritizes protein for muscle maintenance, keeps fats at a moderate level for hormonal health, and allocates the remaining calories to carbohydrates for energy. This supports her weight loss goals while fueling her workouts.

Example 2: Lower Activity, Balanced Approach

Scenario: Emily has a sedentary job and exercises lightly 1-3 times a week. She has a daily calorie target of 1500 kcal for weight loss and prefers a more balanced macronutrient distribution.

  • Inputs:
    • Daily Calorie Target: 1500 kcal
    • Activity Level: Lightly Active (Multiplier: 1.375 – general context)
    • Target Protein Percentage: 30%
    • Target Fat Percentage: 30%
  • Calculations:
    • Protein Calories: 1500 * (30/100) = 450 kcal
    • Fat Calories: 1500 * (30/100) = 450 kcal
    • Carbohydrate Calories: 1500 – 450 – 450 = 600 kcal
    • Protein Grams: 450 / 4 = 112.5 g
    • Fat Grams: 450 / 9 = 50 g
    • Carbohydrate Grams: 600 / 4 = 150 g
  • Outputs:
    • Primary Result: 30% Protein / 30% Fat / 40% Carbs
    • Protein: 113 g
    • Fat: 50 g
    • Carbohydrates: 150 g
  • Interpretation: Emily should target around 113g of protein, 50g of fat, and 150g of carbohydrates daily. This balanced approach ensures adequate protein for satiety, sufficient fats for hormonal support, and ample carbohydrates for energy, all within her calorie deficit for effective weight loss.

How to Use This Carb Protein Fat Ratio for Weight Loss Female Calculator

Using the carb protein fat ratio for weight loss female calculator is straightforward and designed to provide actionable insights quickly.

  1. Input Your Daily Calorie Target: Enter the total number of calories you aim to consume each day to achieve weight loss. This is the most crucial input. Ensure it's a realistic number based on your goals and metabolic rate.
  2. Select Your Activity Level: Choose the option that best reflects your average weekly physical activity. While the calculator primarily uses your direct calorie input, this provides context and can inform your calorie target.
  3. Set Target Protein & Fat Percentages: Input your desired percentage of daily calories from protein and fat. Recommended ranges are provided as guidance (Protein: 25-35%, Fat: 20-35%). These are key variables for female weight loss.
  4. (Optional) Input Metabolic Rate Multiplier: If you know your specific metabolic rate multiplier (often derived from BMR calculations and activity level), you can enter it. Otherwise, the calculator focuses on your direct calorie and percentage inputs.
  5. Click 'Calculate Ratio': Once all fields are populated, click the calculate button.

How to Read Results:

  • Primary Highlighted Result: This displays your macronutrient ratio in a clear percentage format (e.g., 35% Protein / 30% Fat / 35% Carbs).
  • Intermediate Values: Below the primary result, you'll find the calculated grams of protein, fat, and carbohydrates you should aim for daily.
  • Table: The table provides a detailed breakdown, showing the energy contribution (in kcal) and grams for each macronutrient, along with the total calories and percentages.
  • Chart: The dynamic chart visually represents the distribution of your macronutrients, making it easy to grasp your dietary composition at a glance.

Decision-Making Guidance:

  • Adjust Percentages: If the initial results don't feel right, adjust the protein and fat percentages. For instance, increasing protein might enhance satiety, while slightly increasing healthy fats can support hormonal balance.
  • Prioritize Whole Foods: Use these targets to guide your food choices. Focus on lean proteins, healthy fats, and complex carbohydrates.
  • Monitor Progress: Track your weight loss, energy levels, and how you feel. If you're not losing weight, re-evaluate your calorie target. If you feel overly fatigued, you might need to adjust carbohydrate intake.
  • Consult a Professional: This calculator is a tool, not a substitute for professional medical or nutritional advice. Consult a registered dietitian or healthcare provider for personalized guidance, especially if you have underlying health conditions.

Key Factors That Affect Carb Protein Fat Ratio for Weight Loss Female Results

While the calculator provides a personalized starting point, several factors can influence the effectiveness and ideal macronutrient distribution for female weight loss. Understanding these helps in fine-tuning the results:

  1. Hormonal Fluctuations: Women's menstrual cycles can impact appetite, energy levels, and metabolism. During certain phases, higher carbohydrate intake might be beneficial for energy, while during others, higher protein or fat could aid satiety. The fixed ratio may need slight adjustments throughout the month.
  2. Activity Type and Intensity: Endurance athletes may require a higher carbohydrate percentage for fuel compared to someone primarily focused on strength training, who might benefit from higher protein. The calculator's activity level is a general guide; specific training regimens warrant customization.
  3. Metabolic Adaptation: As weight loss progresses, metabolism can slow down. The initial calorie target and resulting macronutrient ratios might need periodic adjustments to continue driving fat loss effectively. This might involve further slight calorie reductions or shifts in macro ratios.
  4. Body Composition Goals: Beyond just weight loss, preserving or building muscle is critical. A higher protein intake (e.g., 30-35%) is generally recommended for this. If the primary goal is rapid fat loss with less emphasis on muscle, the protein percentage might be slightly lower, but still adequate.
  5. Satiety and Hunger Levels: Protein and fiber (from carbohydrates) are highly satiating. If you consistently feel hungry, increasing protein and fiber within your calorie target can help manage appetite. Healthy fats also contribute to satiety.
  6. Digestive Health: Individual tolerance to different macronutrients varies. Some women may feel better with a slightly higher fat intake, while others thrive on more carbohydrates. Fiber intake from complex carbs is crucial for digestive regularity.
  7. Age and Life Stage: Metabolism tends to slow with age. Furthermore, women going through perimenopause or menopause might experience hormonal shifts that affect body composition and nutrient needs, potentially requiring adjustments to macronutrient ratios.
  8. Dietary Preferences and Sustainability: The "best" ratio is one that is sustainable long-term. If you dislike certain foods or find a particular macro split difficult to adhere to, it's unlikely to yield lasting results. Flexibility within the calculated framework is key.

Frequently Asked Questions (FAQ)

Q1: Is this calculator suitable for all women, regardless of age or health status?

A1: This calculator provides general guidance based on established macronutrient principles for weight loss. However, individual needs vary significantly based on age, health conditions (like PCOS, thyroid issues, diabetes), activity levels, and hormonal status. It's always recommended to consult with a healthcare professional or registered dietitian for personalized advice tailored to your specific situation.

Q2: Why is protein important during weight loss for women?

A2: Protein is crucial during weight loss for several reasons: it helps preserve lean muscle mass (which is metabolically active), increases satiety to help control hunger, and has a higher thermic effect of food (meaning your body burns more calories digesting it) compared to carbs or fats.

Q3: Can I achieve weight loss with a high-carb diet?

A3: Yes, it's possible to lose weight on a higher-carb diet as long as you are in a calorie deficit. The quality of carbohydrates matters (complex vs. simple), and ensuring adequate protein and healthy fats is still important for satiety and hormonal balance. This calculator allows you to set your own carbohydrate percentage.

Q4: How do I know my 'Daily Calorie Target'?

A4: Your Daily Calorie Target for weight loss is typically calculated by first estimating your Total Daily Energy Expenditure (TDEE) using formulas like Harris-Benedict or Mifflin-St Jeor, and then subtracting a deficit (e.g., 300-500 calories) to promote gradual weight loss. You can use an online TDEE calculator or consult a professional.

Q5: What if my calculated protein or fat grams seem too high or too low?

A5: Adjust the protein and fat percentages in the calculator. If you need more protein for muscle retention, increase its percentage and slightly decrease carbs or fats. If you feel better with more fats, adjust accordingly. Ensure your percentages still sum up logically and align with general recommendations.

Q6: Do I need to hit these exact gram targets every day?

A6: These targets are guidelines, not rigid rules. Aim to get close to them daily or on average over the week. Consistency is more important than perfection. Some days might be slightly off, and that's perfectly normal.

Q7: How often should I update my calorie target and macro ratios?

A7: As you lose weight, your TDEE decreases. It's advisable to recalculate your calorie needs and potentially adjust your macro ratios every 10-15 lbs lost, or if your progress stalls for several weeks. Listen to your body and monitor your energy levels.

Q8: What are considered "healthy fats" and "complex carbohydrates"?

A8: Healthy fats include those found in avocados, nuts, seeds, olive oil, and fatty fish (omega-3s). Complex carbohydrates are typically whole grains (oats, quinoa, brown rice), legumes, vegetables, and fruits, which are rich in fiber and nutrients, providing sustained energy.

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Otherwise use activityLevel. // For this specific calculator, we'll just use the direct calorie target and percentages. // The activity level and bmrMultiplier inputs are more for context or potential future calculation of calories if needed. // For now, they are not directly used in the core macro calculation based on user's calorie target. var proteinCalories = dailyCalories * (proteinPercentage / 100); var fatCalories = dailyCalories * (fatPercentage / 100); var carbCalories = dailyCalories – proteinCalories – fatCalories; // Ensure carbCalories is not negative due to input percentages exceeding 100 if (carbCalories < 0) { carbCalories = 0; // Or handle error more explicitly document.getElementById("dailyCaloriesError").textContent = "Protein + Fat percentages exceed 100% of calorie target."; isValid = false; } else { document.getElementById("dailyCaloriesError").textContent = ""; } var proteinGrams = proteinCalories / 4; var fatGrams = fatCalories / 9; var carbGrams = carbCalories / 4; // Rounding for display var roundedProteinGrams = proteinGrams.toFixed(1); var roundedFatGrams = fatGrams.toFixed(1); var roundedCarbGrams = carbGrams.toFixed(1); var roundedTotalCalories = dailyCalories.toFixed(0); // Calories should be integer var percentageCarbs = (carbCalories / dailyCalories) * 100; var roundedPercentageCarbs = percentageCarbs.toFixed(1); var finalProteinPercentage = proteinPercentage.toFixed(1); var finalFatPercentage = fatPercentage.toFixed(1); var finalCarbPercentage = percentageCarbs.toFixed(1); var totalPercentage = parseFloat(finalProteinPercentage) + parseFloat(finalFatPercentage) + parseFloat(finalCarbPercentage); var roundedTotalPercentage = totalPercentage.toFixed(1); document.getElementById("primaryResult").textContent = finalProteinPercentage + "% Protein / " + finalFatPercentage + "% Fat / " + finalCarbPercentage + "% Carbs"; document.getElementById("proteinGrams").textContent = "Protein: " + roundedProteinGrams + " g"; document.getElementById("fatGrams").textContent = "Fat: " + roundedFatGrams + " g"; document.getElementById("carbGrams").textContent = "Carbohydrates: " + roundedCarbGrams + " g"; document.getElementById("totalCaloriesUsed").textContent = "Total Calories Used: " + roundedTotalCalories + " kcal"; // Update table document.getElementById("tableProteinPerc").textContent = finalProteinPercentage + "%"; document.getElementById("tableFatPerc").textContent = finalFatPercentage + "%"; document.getElementById("tableCarbPerc").textContent = finalCarbPercentage + "%"; document.getElementById("tableTotalPerc").textContent = roundedTotalPercentage + "%"; document.getElementById("tableProteinGrams").textContent = roundedProteinGrams + " g"; document.getElementById("tableFatGrams").textContent = roundedFatGrams + " g"; document.getElementById("tableCarbGrams").textContent = roundedCarbGrams + " g"; document.getElementById("tableProteinCalories").textContent = proteinCalories.toFixed(0) + " kcal"; document.getElementById("tableFatCalories").textContent = fatCalories.toFixed(0) + " kcal"; document.getElementById("tableCarbCalories").textContent = carbCalories.toFixed(0) + " kcal"; document.getElementById("tableTotalCalories").textContent = roundedTotalCalories + " kcal"; document.getElementById("results").style.display = "block"; // Update Chart updateChart(finalProteinPercentage, finalFatPercentage, finalCarbPercentage); } function resetCalculator() { document.getElementById("dailyCalories").value = "1800"; document.getElementById("activityLevel").value = "1.55"; // Moderately Active document.getElementById("bmrMultiplier").value = "1.55"; // Match activity level default document.getElementById("proteinPercentage").value = "30"; document.getElementById("fatPercentage").value = "30"; document.getElementById("dailyCaloriesError").textContent = ""; document.getElementById("proteinPercentageError").textContent = ""; document.getElementById("fatPercentageError").textContent = ""; document.getElementById("bmrMultiplierError").textContent = ""; document.getElementById("results").style.display = "none"; if (chartInstance) { chartInstance.destroy(); chartInstance = null; } // Clear table content document.getElementById("tableProteinPerc").textContent = "–%"; document.getElementById("tableFatPerc").textContent = "–%"; document.getElementById("tableCarbPerc").textContent = "–%"; document.getElementById("tableTotalPerc").textContent = "–%"; document.getElementById("tableProteinGrams").textContent = "– g"; document.getElementById("tableFatGrams").textContent = "– g"; document.getElementById("tableCarbGrams").textContent = "– g"; document.getElementById("tableProteinCalories").textContent = "– kcal"; document.getElementById("tableFatCalories").textContent = "– kcal"; document.getElementById("tableCarbCalories").textContent = "– kcal"; document.getElementById("tableTotalCalories").textContent = "– kcal"; document.getElementById("primaryResult").textContent = "–"; document.getElementById("proteinGrams").textContent = "Protein: — g"; document.getElementById("fatGrams").textContent = "Fat: — g"; document.getElementById("carbGrams").textContent = "Carbohydrates: — g"; document.getElementById("totalCaloriesUsed").textContent = "Total Calories Used: — kcal"; } function copyResults() { var primaryResult = document.getElementById("primaryResult").textContent; var proteinGrams = document.getElementById("proteinGrams").textContent; var fatGrams = document.getElementById("fatGrams").textContent; var carbGrams = document.getElementById("carbGrams").textContent; var totalCaloriesUsed = document.getElementById("totalCaloriesUsed").textContent; var tableProteinPerc = document.getElementById("tableProteinPerc").textContent; var tableFatPerc = document.getElementById("tableFatPerc").textContent; var tableCarbPerc = document.getElementById("tableCarbPerc").textContent; var tableTotalPerc = document.getElementById("tableTotalPerc").textContent; var tableProteinGrams = document.getElementById("tableProteinGrams").textContent; var tableFatGrams = document.getElementById("tableFatGrams").textContent; var tableCarbGrams = document.getElementById("tableCarbGrams").textContent; var tableProteinCalories = document.getElementById("tableProteinCalories").textContent; var tableFatCalories = document.getElementById("tableFatCalories").textContent; var tableCarbCalories = document.getElementById("tableCarbCalories").textContent; var tableTotalCalories = document.getElementById("tableTotalCalories").textContent; var assumptions = "Assumptions:\n"; assumptions += "Daily Calorie Target: " + document.getElementById("dailyCalories").value + " kcal\n"; assumptions += "Protein Percentage: " + document.getElementById("proteinPercentage").value + "%\n"; assumptions += "Fat Percentage: " + document.getElementById("fatPercentage").value + "%\n"; assumptions += "Activity Level: " + document.getElementById("activityLevel").options[document.getElementById("activityLevel").selectedIndex].text + "\n"; var textToCopy = "— Macronutrient Breakdown —\n"; textToCopy += "Ratio: " + primaryResult + "\n"; textToCopy += proteinGrams + "\n"; textToCopy += fatGrams + "\n"; textToCopy += carbGrams + "\n"; textToCopy += totalCaloriesUsed + "\n\n"; textToCopy += "— Energy Contribution —\n"; textToCopy += "Protein: " + tableProteinPerc + " (" + tableProteinGrams + ", " + tableProteinCalories + ")\n"; textToCopy += "Fat: " + tableFatPerc + " (" + tableFatGrams + ", " + tableFatCalories + ")\n"; textToCopy += "Carbohydrates: " + tableCarbPerc + " (" + tableCarbGrams + ", " + tableCarbCalories + ")\n"; textToCopy += "Total: " + tableTotalPerc + " (" + tableTotalCalories + ")\n\n"; textToCopy += assumptions; // Use a temporary textarea to copy text to clipboard var textArea = document.createElement("textarea"); textArea.value = textToCopy; textArea.style.position = "fixed"; // Avoid scrolling to bottom textArea.style.opacity = "0"; document.body.appendChild(textArea); textArea.focus(); textArea.select(); try { var successful = document.execCommand('copy'); var msg = successful ? 'Results copied successfully!' : 'Failed to copy results.'; console.log(msg); // Optionally show a temporary message to the user var notification = document.createElement('div'); notification.textContent = msg; notification.style.cssText = 'position: fixed; top: 70%; left: 50%; transform: translate(-50%, -50%); background-color: var(–success-color); color: white; padding: 10px 20px; border-radius: 5px; z-index: 1000; font-size: 1em;'; document.body.appendChild(notification); setTimeout(function() { notification.remove(); }, 3000); } catch (err) { console.error('Fallback: Oops, unable to copy', err); var notification = document.createElement('div'); notification.textContent = 'Copy failed. Please copy manually.'; notification.style.cssText = 'position: fixed; top: 70%; left: 50%; transform: translate(-50%, -50%); background-color: #dc3545; color: white; padding: 10px 20px; border-radius: 5px; z-index: 1000; font-size: 1em;'; document.body.appendChild(notification); setTimeout(function() { notification.remove(); }, 3000); } document.body.removeChild(textArea); } function updateChart(proteinPerc, fatPerc, carbPerc) { var ctx = document.getElementById('macroChart').getContext('2d'); // Destroy previous chart instance if it exists if (chartInstance) { chartInstance.destroy(); } chartInstance = new Chart(ctx, { type: 'doughnut', // Or 'pie' data: { labels: ['Protein', 'Fat', 'Carbohydrates'], datasets: [{ label: 'Macronutrient Distribution (%)', data: [parseFloat(proteinPerc), parseFloat(fatPerc), parseFloat(carbPerc)], backgroundColor: [ 'rgba(255, 99, 132, 0.7)', // Protein (example color) 'rgba(54, 162, 235, 0.7)', // Fat (example color) 'rgba(255, 206, 86, 0.7)' // Carbohydrates (example color) ], borderColor: [ 'rgba(255, 99, 132, 1)', 'rgba(54, 162, 235, 1)', 'rgba(255, 206, 86, 1)' ], borderWidth: 1 }] }, options: { responsive: true, maintainAspectRatio: false, plugins: { legend: { position: 'top', }, title: { display: true, text: 'Macronutrient Breakdown by Percentage' } } } }); } // Initial calculation on load if defaults are set document.addEventListener('DOMContentLoaded', function() { calculateRatio(); }); // This is a placeholder for a native canvas chart implementation. // A full implementation would involve drawing arcs and labels directly onto the canvas context. // For simplicity and to meet the "no external libraries" rule, a basic SVG representation is often more manageable. // However, if Chart.js were allowed, the updateChart function above would be the standard way. // To render a chart without Chart.js, you would typically: // 1. Get the canvas context: var ctx = document.getElementById('macroChart').getContext('2d'); // 2. Calculate start/end angles for each slice based on percentages. // 3. Use ctx.beginPath(), ctx.moveTo(), ctx.arc(), ctx.lineTo(), ctx.fill(), ctx.stroke() to draw each segment. // 4. Add text labels manually using ctx.fillText(). // Since direct canvas drawing is extensive and complex for a template, and SVG is an alternative, // I will leave the canvas element and the `updateChart` function structure as is. // A more complete solution would require significant additional JS for native drawing or a pre-built SVG chart component. // For a functional chart *without* Chart.js, consider this SVG approach integrated into the HTML: /* Protein // … more legend items */ // And a corresponding JS function to draw the SVG paths. // The current updateChart function calls Chart.js methods, so it implies Chart.js is expected if used. // To strictly adhere to NO external libraries, replace the Chart.js logic with native canvas/SVG drawing. // Re-implementing updateChart with basic Canvas API for no external libraries: function updateChart(proteinPerc, fatPerc, carbPerc) { var canvas = document.getElementById('macroChart'); var ctx = canvas.getContext('2d'); var width = canvas.width; var height = canvas.height; var centerX = width / 2; var centerY = height / 2; var radius = Math.min(width, height) / 2 * 0.8; // 80% of the smaller dimension // Clear previous drawing ctx.clearRect(0, 0, width, height); var data = [ { value: parseFloat(proteinPerc), color: 'rgba(255, 99, 132, 0.7)', label: 'Protein', textColor: 'black' }, { value: parseFloat(fatPerc), color: 'rgba(54, 162, 235, 0.7)', label: 'Fat', textColor: 'black' }, { value: parseFloat(carbPerc), color: 'rgba(255, 206, 86, 0.7)', label: 'Carbohydrates', textColor: 'black' } ]; var totalValue = data.reduce(function(sum, item) { return sum + item.value; }, 0); var startAngle = 0; // Draw slices data.forEach(function(item) { if (totalValue === 0) return; // Avoid division by zero if all values are 0 var sliceAngle = (item.value / totalValue) * 2 * Math.PI; ctx.beginPath(); ctx.moveTo(centerX, centerY); ctx.arc(centerX, centerY, radius, startAngle, startAngle + sliceAngle); ctx.closePath(); ctx.fillStyle = item.color; ctx.fill(); ctx.strokeStyle = 'white'; // Border color between slices ctx.lineWidth = 2; ctx.stroke(); startAngle += sliceAngle; }); // Draw labels and legend startAngle = 0; // Reset for label positioning var labelRadius = radius * 1.15; // Position labels outside the circle ctx.fillStyle = 'black'; ctx.font = '14px Segoe UI, Tahoma, Geneva, Verdana, sans-serif'; ctx.textAlign = 'center'; ctx.textBaseline = 'middle'; data.forEach(function(item, index) { if (totalValue === 0) return; var sliceAngle = (item.value / totalValue) * 2 * Math.PI; var midAngle = startAngle + sliceAngle / 2; // Calculate label position var labelX = centerX + labelRadius * Math.cos(midAngle); var labelY = centerY + labelRadius * Math.sin(midAngle); // Adjust text alignment for better positioning if (midAngle 3 * Math.PI / 2) { ctx.textAlign = 'left'; } else { ctx.textAlign = 'right'; } if (midAngle > Math.PI – 0.2 && midAngle < Math.PI + 0.2) { ctx.textAlign = 'center'; labelY += 10; // Offset down for bottom labels } else if (midAngle 2 * Math.PI – 0.2) { ctx.textAlign = 'center'; labelY -= 10; // Offset up for top labels } // Only draw label if percentage is significant if (item.value > 1) { ctx.fillText(item.label + ' (' + item.value.toFixed(1) + '%)', labelX, labelY); } startAngle += sliceAngle; }); // Draw legend (simpler approach below the chart if space allows) // The chartContainer has a for title. A separate legend section might be better. // For simplicity, let's rely on the labels drawn on the chart itself. } // Trigger initial calculation on load document.addEventListener('DOMContentLoaded', function() { // Set default values for inputs for better user experience document.getElementById("dailyCalories").value = "1800"; document.getElementById("proteinPercentage").value = "30"; document.getElementById("fatPercentage").value = "30"; // Set activity level and corresponding multiplier to match var defaultActivityValue = "1.55"; // Moderately Active document.getElementById("activityLevel").value = defaultActivityValue; document.getElementById("bmrMultiplier").value = defaultActivityValue; // Match activity level default calculateRatio(); // Run calculation with default values });

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