Carb Calculator to Maintain Weight

Determine your ideal daily carbohydrate intake for weight maintenance.

Carb Intake Calculator

A carb calculator to maintain weight is an online tool designed to help individuals determine the optimal daily intake of carbohydrates required to sustain their current body weight. Unlike calculators focused on weight loss or gain, this tool specifically targets individuals who have reached their desired weight and wish to maintain it through balanced nutrition. It takes into account various personal factors such as activity level, body weight, height, age, and biological sex to provide a personalized carbohydrate target, often as a percentage of total daily calories.

Who should use it? Anyone looking to maintain their current weight while understanding their macronutrient needs can benefit. This includes athletes, fitness enthusiasts, individuals managing chronic conditions that require specific dietary patterns, or simply those who want to maintain their physique without restrictive dieting. A carb calculator to maintain weight is particularly useful for individuals who find tracking calories complex but can more easily manage their carbohydrate intake. Understanding your personalized carb needs is a crucial step towards achieving sustainable, long-term health and fitness goals. It's a key component in maintaining metabolic health and energy levels.

Common misconceptions about carbohydrate intake for weight maintenance include the idea that all carbs are bad or that a very low-carb diet is the only way to keep weight stable. In reality, carbohydrates are an essential macronutrient that provides energy for daily activities and exercise. The type and quantity of carbohydrates matter, but for many, moderate to higher carbohydrate intake, balanced with adequate protein and fat, is perfectly compatible with weight maintenance. Another misconception is that a single formula fits everyone; individual needs vary significantly based on metabolism, activity, and genetics, which is why personalized calculators are valuable.

Carb Calculator to Maintain Weight Formula and Mathematical Explanation

The calculation for a carb calculator to maintain weight involves several steps, starting with estimating the body's energy needs and then allocating a portion to carbohydrates. The core principle is matching calorie intake to calorie expenditure to prevent weight gain or loss.

Step 1: Calculate Basal Metabolic Rate (BMR)

BMR is the number of calories your body burns at rest to maintain basic functions. We can use two common formulas:

Revised Harris-Benedict Equation (1990):

• Men: BMR = (13.397 × weight in kg) + (4.799 × height in cm) – (5.677 × age in years) + 88.362
• Women: BMR = (9.247 × weight in kg) + (3.098 × height in cm) – (4.330 × age in years) + 447.593

Mifflin-St Jeor Equation (often considered more accurate):

• Men: BMR = (10 × weight in kg) + (6.25 × height in cm) – (5 × age in years) + 5
• Women: BMR = (10 × weight in kg) + (6.25 × height in cm) – (5 × age in years) – 161

Step 2: Calculate Total Daily Energy Expenditure (TDEE)

TDEE accounts for your BMR plus the calories burned through physical activity. It's calculated by multiplying BMR by an Activity Factor:

TDEE = BMR × Activity Factor

The Activity Factor varies:

• Sedentary: 1.2
• Lightly Active: 1.375
• Moderately Active: 1.55
• Very Active: 1.725
• Extra Active: 1.9

Step 3: Calculate Target Macronutrient Grams

To maintain weight, your TDEE represents your target daily calorie intake. We then allocate a percentage to carbohydrates.

Calories from Carbohydrates = TDEE × (Carbohydrate Percentage / 100)

Since carbohydrates provide 4 calories per gram:

Grams of Carbohydrates = Calories from Carbohydrates / 4

For other macronutrients (often for simplicity in maintenance, protein and fat are kept at standard levels, and carbs fill the rest):

Protein: A common recommendation for active individuals is 1.2 to 2.0 grams per kilogram of body weight.

Grams of Protein = Body Weight (kg) × (Recommended Protein g/kg)

Calories from Protein = Grams of Protein × 4

Fat: A common range is 20-30% of total calories, or sufficient to meet needs after protein and carbs are calculated.

Grams of Fat = (TDEE – Calories from Carbohydrates – Calories from Protein) / 9 (since fat has 9 calories per gram)

Variables Table:

Variables Used in Calculation

Variable	Meaning	Unit	Typical Range
Weight	Body Mass	Kilograms (kg)	30 – 200+ kg
Height	Body Height	Centimeters (cm)	100 – 210 cm
Age	Years of Life	Years	18 – 90+ years
Activity Factor	Level of Physical Exertion	Multiplier	1.2 – 1.9
Carbohydrate Percentage	Proportion of calories from carbs	%	40% – 60% (for maintenance)
TDEE	Total Daily Energy Expenditure	Kilocalories (kcal)	1500 – 4000+ kcal
Carb Grams	Daily Carbohydrate intake	Grams (g)	150 – 600+ g

This detailed breakdown ensures that the carb calculator to maintain weight provides a comprehensive and personalized result, aligning macronutrient intake with overall energy balance for weight stability.

Practical Examples (Real-World Use Cases)

Here are a couple of examples demonstrating how the carb calculator to maintain weight can be used:

Example 1: Moderately Active Woman Maintaining Weight

Scenario: Sarah is a 35-year-old woman who works an office job but goes to the gym for moderate exercise 4 days a week. She is 165 cm tall, weighs 62 kg, and wants to maintain her weight. She prefers a balanced diet and sets her carbohydrate percentage to 50%.

Inputs:

• Activity Level: Moderately Active (1.55)
• Body Weight: 62 kg
• BMR Method: Mifflin-St Jeor
• Biological Sex: Female
• Height: 165 cm
• Age: 35 years
• Carbohydrate Percentage: 50%

Calculation:

• BMR (Mifflin-St Jeor, Female): (10 × 62) + (6.25 × 165) – (5 × 35) – 161 = 620 + 1031.25 – 175 – 161 = 1315.25 kcal
• TDEE: 1315.25 × 1.55 = 2038.6 kcal
• Calories from Carbs: 2038.6 × (50 / 100) = 1019.3 kcal
• Carbohydrate Grams: 1019.3 / 4 = 254.8 g
• Let's assume a protein intake of 1.5g/kg: 62 kg × 1.5 g/kg = 93 g protein (93 * 4 = 372 kcal)
• Calories from Fat: 2038.6 – 1019.3 – 372 = 647.3 kcal
• Fat Grams: 647.3 / 9 = 71.9 g

Results:

• Target Daily Calories: ~2039 kcal
• Carbohydrate Intake: ~255 grams
• Protein Intake: ~93 grams
• Fat Intake: ~72 grams

Interpretation: Sarah should aim for approximately 2039 calories per day, with about 255 grams of carbohydrates, 93 grams of protein, and 72 grams of fat to maintain her current weight of 62 kg. This provides a clear nutritional guideline for her meals.

Example 2: Very Active Man Maintaining Muscle Mass

Scenario: David is a 28-year-old male who engages in intense weight training 6 days a week and has a physically demanding job. He is 185 cm tall and weighs 85 kg. He wants to maintain his muscle mass and overall weight. He sets his carbohydrate percentage to 45%.

Inputs:

• Activity Level: Very Active (1.725)
• Body Weight: 85 kg
• BMR Method: Harris-Benedict (Revised)
• Biological Sex: Male
• Height: 185 cm
• Age: 28 years
• Carbohydrate Percentage: 45%

Calculation:

• BMR (Harris-Benedict, Male): (13.397 × 85) + (4.799 × 185) – (5.677 × 28) + 88.362 = 1138.75 + 887.815 – 158.956 + 88.362 = 1956 kcal
• TDEE: 1956 × 1.725 = 3373.5 kcal
• Calories from Carbs: 3373.5 × (45 / 100) = 1518.1 kcal
• Carbohydrate Grams: 1518.1 / 4 = 379.5 g
• Let's assume a higher protein intake of 2.0g/kg for muscle maintenance: 85 kg × 2.0 g/kg = 170 g protein (170 * 4 = 680 kcal)
• Calories from Fat: 3373.5 – 1518.1 – 680 = 1175.4 kcal
• Fat Grams: 1175.4 / 9 = 130.6 g

Results:

• Target Daily Calories: ~3374 kcal
• Carbohydrate Intake: ~380 grams
• Protein Intake: ~170 grams
• Fat Intake: ~131 grams

Interpretation: David needs a substantial intake of approximately 3374 calories daily to maintain his weight and muscle mass. His macronutrient targets are around 380 grams of carbohydrates, 170 grams of protein, and 131 grams of fat. This higher carb intake fuels his intense workouts and recovery.

These examples illustrate how the carb calculator to maintain weight personalizes recommendations based on individual characteristics and goals, ensuring adequate fuel for daily life and activity.

How to Use This Carb Calculator to Maintain Weight

Using our carb calculator to maintain weight is straightforward and designed to provide you with quick, actionable insights into your nutritional needs. Follow these simple steps:

1. Select Your Activity Level: Choose the option that most accurately reflects your average daily physical activity. Be honest about your exercise frequency and intensity, as well as any physical demands of your job. This is a crucial factor in determining your total daily energy expenditure (TDEE).
2. Enter Your Body Weight: Input your current weight in kilograms (kg). For weight maintenance, this should be the weight you aim to keep stable.
3. Choose BMR Calculation Method: You can select either the Harris-Benedict (Revised) or Mifflin-St Jeor equation. Mifflin-St Jeor is often considered more accurate for general populations.
4. Specify Biological Sex: Select 'Male' or 'Female'. This is a necessary input for the BMR calculation formulas.
5. Input Your Height: Enter your height in centimeters (cm).
6. Provide Your Age: Enter your age in years.
7. Set Carbohydrate Percentage: Decide what percentage of your total daily calories you want to derive from carbohydrates. For weight maintenance, a range of 40-60% is common and effective for many individuals, depending on personal preference and dietary goals.
8. Click Calculate: Once all fields are filled, press the 'Calculate' button.

How to Read Results:

• Main Result (Carbs in Grams): This is your primary target for daily carbohydrate intake in grams, essential for maintaining your current weight.
• Total Daily Calories: This indicates the total number of calories you should consume each day to maintain your weight, based on your inputs.
• Protein and Fat Grams: These show the calculated grams of protein and fat needed to complete your macronutrient profile, typically based on standard recommendations for active individuals.
• Key Assumptions: Review the assumptions noted below the results, such as consistent weight and activity level, to understand the context of the calculation.

Decision-Making Guidance:

The results from the carb calculator to maintain weight serve as a guideline, not a rigid rule. Use these numbers to structure your meals and snacks throughout the day. If you find yourself gaining weight, you might slightly reduce your carbohydrate intake or activity level. If you're losing weight unintentionally, consider a slight increase. Pay attention to your body's energy levels, hunger cues, and overall well-being. Adjustments may be needed based on how you feel and perform.

The 'Reset' button clears all fields to their default values, allowing you to start over easily. The 'Copy Results' button lets you save your calculated figures for easy reference or sharing.

Key Factors That Affect Carb Calculator to Maintain Weight Results

While a carb calculator to maintain weight provides a personalized estimate, several factors can influence the accuracy and effectiveness of its results. Understanding these can help you fine-tune your intake and achieve your goals:

1. Metabolic Adaptation: Your metabolism isn't static. If you've been on a prolonged calorie deficit or very low-carb diet, your metabolism might adapt, requiring fewer calories to maintain weight. Conversely, periods of overeating can temporarily increase metabolic rate. The calculator assumes a standard metabolic response.
2. Body Composition: Muscle tissue burns more calories at rest than fat tissue. An individual with higher muscle mass (e.g., an athlete) will have a higher TDEE than someone of the same weight and height but with lower muscle mass. The calculator uses general formulas that may not fully capture significant differences in body composition.
3. Hormonal Fluctuations: Hormones play a significant role in metabolism and appetite regulation. Factors like thyroid function, stress hormones (cortisol), and sex hormones can influence energy expenditure and nutrient partitioning, affecting weight maintenance.
4. Gut Health and Microbiome: The composition of your gut bacteria can impact how efficiently you digest food and absorb nutrients, including carbohydrates. A healthy microbiome can contribute to better metabolic health and more predictable results from a calculator.
5. Sleep Quality and Quantity: Poor sleep can disrupt hormones related to appetite (ghrelin and leptin) and increase cortisol levels, leading to increased hunger, cravings for high-carb foods, and potentially altered metabolism, making weight maintenance more challenging.
6. Nutrient Timing and Meal Composition: While the calculator focuses on daily totals, *when* and *how* you consume your carbohydrates can impact energy levels and satiety. Spreading carb intake throughout the day, especially around workouts, can be more effective for performance and maintenance than consuming them all at once.
7. Hydration Levels: Water is essential for metabolic processes. Dehydration can slow down metabolism and affect overall physical performance, indirectly influencing the energy balance required for weight maintenance.
8. Genetics: Individual genetic predispositions can influence how your body processes macronutrients, your metabolic rate, and your tendency to store fat or build muscle. While calculators provide a good starting point, genetic variations mean that optimal intake can differ person-to-person.

By considering these nuances alongside the calculator's output, individuals can achieve more sustainable and effective weight maintenance. It underscores the importance of listening to your body and making informed adjustments.

Frequently Asked Questions (FAQ)

Q1: Can this calculator help me lose weight?

A: No, this specific carb calculator to maintain weight is designed to help you determine the carbohydrate intake needed to *stay* at your current weight. For weight loss, you would typically need to consume fewer calories than your TDEE, which requires a different type of calculator or approach (e.g., calorie deficit).

Q2: What is the best carbohydrate percentage for weight maintenance?

A: The "best" percentage varies significantly based on individual factors like activity level, genetics, and dietary preferences. A range of 40-60% of total daily calories is commonly recommended for weight maintenance, providing sufficient energy without leading to weight gain. Experiment within this range to see what feels best for your energy levels and satiety.

Q3: Should I use the Harris-Benedict or Mifflin-St Jeor formula?

A: The Mifflin-St Jeor equation is generally considered more accurate for most people in contemporary populations. However, the Harris-Benedict equation (revised) is also widely used. Using the Mifflin-St Jeor is often recommended for a more precise estimate.

Q4: How often should I recalculate my carb intake?

A: Recalculate if your weight changes significantly (more than 5%), your activity level changes drastically (e.g., starting a new job or intense training program), or if you notice your weight consistently drifting up or down despite adhering to your calculated intake.

Q5: Does the type of carbohydrate matter?

A: Absolutely. While the calculator focuses on quantity (grams), the quality of carbohydrates is crucial for overall health and sustainable weight maintenance. Prioritize complex carbohydrates like whole grains, fruits, vegetables, and legumes over refined sugars and processed foods. These provide fiber, vitamins, and minerals, promoting better satiety and metabolic health.

Q6: What if my calculated protein or fat intake seems too low or too high?

A: The calculator provides standard estimates for protein and fat based on common recommendations. You can adjust these based on your personal goals (e.g., higher protein for muscle building). Ensure your total calories from all macronutrients do not significantly exceed your TDEE for maintenance. For example, if you prefer more fat, you might reduce carbs slightly, keeping total calories constant.

Q7: Can I maintain weight on a very low-carb (ketogenic) diet?

A: Yes, some individuals can maintain weight on a ketogenic diet (typically <50g carbs per day). However, this calculator assumes a more moderate to higher carbohydrate intake for general maintenance. If you are on a ketogenic diet, you would adjust the carbohydrate percentage significantly lower and ensure adequate fat intake. Our calculator allows you to set the percentage, so you could test very low values, but the protein and fat calculations are based on standard assumptions.

Q8: My results seem different from other online calculators. Why?

A: Differences often arise from the specific BMR formulas used (Harris-Benedict vs. Mifflin-St Jeor vs. Katch-McArdle), the activity factor multipliers, and how protein and fat targets are calculated. Our calculator uses widely accepted methodologies, but variations are normal.

function validateInput(id, minValue, maxValue) { var input = document.getElementById(id); var errorDiv = document.getElementById(id + "Error"); var value = parseFloat(input.value); if (isNaN(value) || input.value.trim() === "") { errorDiv.textContent = "This field is required."; errorDiv.style.display = "block"; input.classList.add("error-active"); document.getElementById(id).classList.add("error-active-border"); return false; } if (value maxValue) { errorDiv.textContent = "Value cannot be greater than " + maxValue + "."; errorDiv.style.display = "block"; input.classList.add("error-active"); document.getElementById(id).classList.add("error-active-border"); return false; } errorDiv.textContent = ""; errorDiv.style.display = "none"; input.classList.remove("error-active"); document.getElementById(id).classList.remove("error-active-border"); return true; } function calculateBMR(weight, height, age, gender, method) { var bmr = 0; if (method === "harris-benedict") { if (gender === "male") { bmr = (13.397 * weight) + (4.799 * height) – (5.677 * age) + 88.362; } else { bmr = (9.247 * weight) + (3.098 * height) – (4.330 * age) + 447.593; } } else { // mifflin-st jeor if (gender === "male") { bmr = (10 * weight) + (6.25 * height) – (5 * age) + 5; } else { bmr = (10 * weight) + (6.25 * height) – (5 * age) – 161; } } return bmr; } function calculateCarbs() { var weight = parseFloat(document.getElementById("bodyWeight").value); var height = parseFloat(document.getElementById("heightCm").value); var age = parseFloat(document.getElementById("age").value); var gender = document.getElementById("gender").value; var activityLevel = parseFloat(document.getElementById("activityLevel").value); var carbPercentage = parseFloat(document.getElementById("carbPercentage").value); var bmrMethod = document.getElementById("bmrMethod").value; var isValid = true; isValid = validateInput("bodyWeight", 0, null) && isValid; isValid = validateInput("heightCm", 0, null) && isValid; isValid = validateInput("age", 0, null) && isValid; isValid = validateInput("carbPercentage", 0, 100) && isValid; if (!isValid) { return; } var bmr = calculateBMR(weight, height, age, gender, bmrMethod); var tdee = bmr * activityLevel; var carbCalories = tdee * (carbPercentage / 100); var carbGrams = carbCalories / 4; // Standard protein and fat calculation for maintenance // Protein: ~1.5-2.0g/kg for active individuals var proteinGrams = weight * 1.75; // Using a mid-range value if (proteinGrams < 50) proteinGrams = 50; // Ensure a minimum protein intake var proteinCalories = proteinGrams * 4; // Fat: remaining calories, typically 20-30% var fatCalories = tdee – carbCalories – proteinCalories; var fatGrams = fatCalories / 9; // Ensure fat is not negative and within a reasonable range if (fatGrams < 0) { fatGrams = 0; fatCalories = 0; // If fat is 0, redistribute remaining calories to carbs/protein, // but for simplicity here, we'll just cap it and var total calories reflect it. // A more complex adjustment could be made. } // Adjust carb percentage if calculated fat/protein differ significantly from typical ranges // This ensures total calories match TDEE var adjustedTDEE = (carbGrams * 4) + (proteinGrams * 4) + (fatGrams * 9); document.getElementById("totalCalories").textContent = tdee.toFixed(0) + " kcal"; document.getElementById("mainResult").textContent = carbGrams.toFixed(0) + " g"; document.getElementById("carbGrams").textContent = carbGrams.toFixed(0) + " g"; document.getElementById("proteinGrams").textContent = proteinGrams.toFixed(0) + " g"; document.getElementById("fatGrams").textContent = fatGrams.toFixed(0) + " g"; document.getElementById("resultsWrapper").classList.remove("hidden"); updateChart(tdee, carbGrams, proteinGrams, fatGrams); } function resetCalculator() { document.getElementById("activityLevel").value = "1.55"; document.getElementById("bodyWeight").value = ""; document.getElementById("bmrMethod").value = "Mifflin-St Jeor"; document.getElementById("gender").value = "male"; document.getElementById("heightCm").value = ""; document.getElementById("age").value = ""; document.getElementById("carbPercentage").value = "50"; document.getElementById("bodyWeightError").textContent = ""; document.getElementById("bodyWeightError").style.display = "none"; document.getElementById("bodyWeight").classList.remove("error-active"); document.getElementById("bodyWeight").classList.remove("error-active-border"); document.getElementById("heightCmError").textContent = ""; document.getElementById("heightCmError").style.display = "none"; document.getElementById("heightCm").classList.remove("error-active"); document.getElementById("heightCm").classList.remove("error-active-border"); document.getElementById("ageError").textContent = ""; document.getElementById("ageError").style.display = "none"; document.getElementById("age").classList.remove("error-active"); document.getElementById("age").classList.remove("error-active-border"); document.getElementById("carbPercentageError").textContent = ""; document.getElementById("carbPercentageError").style.display = "none"; document.getElementById("carbPercentage").classList.remove("error-active"); document.getElementById("carbPercentage").classList.remove("error-active-border"); document.getElementById("totalCalories").textContent = "– kcal"; document.getElementById("mainResult").textContent = "– g"; document.getElementById("carbGrams").textContent = "– g"; document.getElementById("proteinGrams").textContent = "– g"; document.getElementById("fatGrams").textContent = "– g"; document.getElementById("resultsWrapper").classList.add("hidden"); // Clear chart var ctx = document.getElementById('macroChart').getContext('2d'); ctx.clearRect(0, 0, ctx.canvas.width, ctx.canvas.height); } function copyResults() { var mainResultEl = document.getElementById("mainResult"); var totalCaloriesEl = document.getElementById("totalCalories"); var carbGramsEl = document.getElementById("carbGrams"); var proteinGramsEl = document.getElementById("proteinGrams"); var fatGramsEl = document.getElementById("fatGrams"); var resultsText = "Carb Intake for Weight Maintenance:\n\n"; resultsText += "Your Daily Carb Intake: " + mainResultEl.textContent + "\n"; resultsText += "Total Daily Calories: " + totalCaloriesEl.textContent + "\n"; resultsText += "Carbohydrate Target: " + carbGramsEl.textContent + "\n"; resultsText += "Protein Target: " + proteinGramsEl.textContent + "\n"; resultsText += "Fat Target: " + fatGramsEl.textContent + "\n\n"; resultsText += "Key Assumptions:\n"; resultsText += "- Calculation based on provided BMR formula and activity level.\n"; resultsText += "- Assumes current weight is target maintenance weight.\n"; resultsText += "- Protein and Fat targets are standard recommendations.\n"; navigator.clipboard.writeText(resultsText).then(function() { // Optional: Provide user feedback that it was copied var copyButton = document.querySelector('button[onclick="copyResults()"]'); var originalText = copyButton.textContent; copyButton.textContent = "Copied!"; setTimeout(function() { copyButton.textContent = originalText; }, 2000); }, function(err) { console.error('Failed to copy results: ', err); alert('Failed to copy results. Please copy manually.'); }); } // Chart Implementation var macroChart; // Declare chart variable globally function updateChart(tdee, carbGrams, proteinGrams, fatGrams) { var carbCalories = carbGrams * 4; var proteinCalories = proteinGrams * 4; var fatCalories = fatGrams * 9; var totalCalories = carbCalories + proteinCalories + fatCalories; // Ensure total calories from macros matches TDEE for chart accuracy, adjust if necessary // This is a simplified adjustment; a more robust method might re-proportion var scaleFactor = tdee / totalCalories; carbCalories *= scaleFactor; proteinCalories *= scaleFactor; fatCalories *= scaleFactor; var ctx = document.getElementById('macroChart').getContext('2d'); // Destroy previous chart instance if it exists if (macroChart) { macroChart.destroy(); } macroChart = new Chart(ctx, { type: 'pie', // Changed to pie for macro distribution data: { labels: ['Carbohydrates', 'Protein', 'Fat'], datasets: [{ label: 'Macronutrient Calories', data: [carbCalories, proteinCalories, fatCalories], backgroundColor: [ 'rgba(255, 99, 132, 0.7)', // Carbs (Reddish) 'rgba(54, 162, 235, 0.7)', // Protein (Blue) 'rgba(255, 206, 86, 0.7)' // Fat (Yellow) ], borderColor: [ 'rgba(255, 99, 132, 1)', 'rgba(54, 162, 235, 1)', 'rgba(255, 206, 86, 1)' ], borderWidth: 1 }] }, options: { responsive: true, maintainAspectRatio: false, // Allow chart to resize vertically plugins: { legend: { position: 'bottom', }, title: { display: true, text: 'Daily Macronutrient Calorie Distribution', font: { size: 16 } }, tooltip: { callbacks: { label: function(context) { var label = context.label || ''; if (label) { label += ': '; } if (context.parsed) { var calories = context.parsed; var percentage = ((calories / tdee) * 100).toFixed(1); label += calories.toFixed(0) + ' kcal (' + percentage + '%)'; } return label; } } } } } }); } // Initial Chart Setup (hidden until first calculation) var chartCanvas = document.createElement('canvas'); chartCanvas.id = 'macroChart'; chartCanvas.style.maxWidth = '600px'; // Limit chart width on smaller screens chartCanvas.style.margin = '30px auto 0'; chartCanvas.style.display = 'block'; chartCanvas.style.backgroundColor = '#fff'; chartCanvas.style.borderRadius = '5px'; chartCanvas.style.boxShadow = '0 4px 12px rgba(0, 0, 0, 0.08)'; // Find where to insert the chart, e.g., after the results wrapper var resultsWrapper = document.getElementById('resultsWrapper'); if (resultsWrapper) { resultsWrapper.parentNode.insertBefore(chartCanvas, resultsWrapper.nextSibling); } else { // Fallback if resultsWrapper is not found document.querySelector('.calculator-wrapper').appendChild(chartCanvas); } // Initialize with dummy data or wait for calculation updateChart(2000, 250, 100, 60); // Placeholder values for initial structure document.getElementById('macroChart').style.display = 'none'; // Hide until first calc // Add event listeners for real-time updates (optional, calculation on button click is required) document.getElementById('bodyWeight').addEventListener('input', calculateCarbs); document.getElementById('heightCm').addEventListener('input', calculateCarbs); document.getElementById('age').addEventListener('input', calculateCarbs); document.getElementById('activityLevel').addEventListener('change', calculateCarbs); document.getElementById('gender').addEventListener('change', calculateCarbs); document.getElementById('bmrMethod').addEventListener('change', calculateCarbs); document.getElementById('carbPercentage').addEventListener('input', calculateCarbs); // Ensure chart is visible after first calculation var originalCalculateCarbs = window.calculateCarbs; window.calculateCarbs = function() { originalCalculateCarbs(); document.getElementById('macroChart').style.display = 'block'; }; // Reset chart visibility on reset var originalResetCalculator = window.resetCalculator; window.resetCalculator = function() { originalResetCalculator(); document.getElementById('macroChart').style.display = 'none'; };