How to Calculate Amount of Protein per Body Weight

Calculate Daily Protein Intake Per Body Weight – Your Protein Needs :root { –primary-color: #004a99; –success-color: #28a745; –background-color: #f8f9fa; –text-color: #333; –light-gray: #e9ecef; –white: #fff; –border-radius: 5px; –box-shadow: 0 4px 10px rgba(0,0,0,0.1); } body { font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif; background-color: var(–background-color); color: var(–text-color); margin: 0; padding: 0; line-height: 1.6; } .container { max-width: 980px; margin: 20px auto; padding: 20px; background-color: var(–white); border-radius: var(–border-radius); box-shadow: var(–box-shadow); } header { background-color: var(–primary-color); color: var(–white); padding: 15px 0; text-align: center; border-radius: var(–border-radius) var(–border-radius) 0 0; } header h1 { margin: 0; font-size: 2em; } h1, h2, h3 { color: var(–primary-color); } h2 { margin-top: 30px; border-bottom: 2px solid var(–primary-color); padding-bottom: 5px; } .calculator-wrapper { background-color: var(–white); border-radius: var(–border-radius); padding: 25px; margin-bottom: 30px; box-shadow: 0 2px 5px rgba(0,0,0,0.05); } .calculator-wrapper h2 { text-align: center; margin-top: 0; margin-bottom: 25px; border-bottom: none; } .input-group { margin-bottom: 20px; } .input-group label { display: block; margin-bottom: 8px; font-weight: bold; color: var(–primary-color); } .input-group input[type="number"], .input-group select { width: calc(100% – 16px); padding: 10px; border: 1px solid var(–light-gray); border-radius: var(–border-radius); box-sizing: border-box; font-size: 1em; } .input-group select { cursor: pointer; } .input-group .helper-text { font-size: 0.85em; color: #6c757d; margin-top: 5px; } .input-group .error-message { color: #dc3545; font-size: 0.85em; margin-top: 5px; display: none; /* Hidden by default */ } .error-message.visible { display: block; } .button-group { margin-top: 30px; display: flex; justify-content: space-between; flex-wrap: wrap; gap: 10px; } .button-group button { padding: 12px 20px; border: none; border-radius: var(–border-radius); cursor: pointer; font-size: 1em; font-weight: bold; transition: background-color 0.3s ease; } .btn-calculate { background-color: var(–primary-color); color: var(–white); flex-grow: 1; /* Allow to grow */ } .btn-calculate:hover { background-color: #003d7a; } .btn-reset { background-color: #6c757d; color: var(–white); } .btn-reset:hover { background-color: #5a6268; } .btn-copy { background-color: var(–success-color); color: var(–white); } .btn-copy:hover { background-color: #218838; } .results-display { margin-top: 30px; padding: 20px; background-color: var(–light-gray); border-radius: var(–border-radius); text-align: center; } .results-display h3 { margin-top: 0; color: var(–primary-color); font-size: 1.5em; } .primary-result { font-size: 2.5em; font-weight: bold; color: var(–success-color); margin: 15px 0; padding: 10px; background-color: var(–white); border-radius: var(–border-radius); box-shadow: inset 0 0 5px rgba(0,0,0,0.1); } .intermediate-results div, .formula-explanation, .key-assumptions div { margin-bottom: 15px; font-size: 1.1em; } .formula-explanation strong, .key-assumptions strong { color: var(–primary-color); } .chart-container, .table-container { margin-top: 30px; padding: 20px; background-color: var(–white); border-radius: var(–border-radius); box-shadow: 0 2px 5px rgba(0,0,0,0.05); } caption { font-size: 1.2em; font-weight: bold; color: var(–primary-color); margin-bottom: 15px; caption-side: top; text-align: left; } table { width: 100%; border-collapse: collapse; margin-top: 15px; } th, td { padding: 10px; border: 1px solid var(–light-gray); text-align: center; } th { background-color: var(–primary-color); color: var(–white); font-weight: bold; } td { background-color: var(–white); } tr:nth-child(even) td { background-color: var(–light-gray); } canvas { display: block; margin: 15px auto 0; max-width: 100%; background-color: var(–white); border-radius: var(–border-radius); border: 1px solid var(–light-gray); } .article-content { margin-top: 40px; background-color: var(–white); padding: 30px; border-radius: var(–border-radius); box-shadow: var(–box-shadow); } .article-content h2 { margin-top: 30px; margin-bottom: 15px; border-bottom: 2px solid var(–primary-color); } .article-content h3 { margin-top: 20px; margin-bottom: 10px; color: #0056b3; } .article-content p, .article-content ul, .article-content ol { margin-bottom: 15px; } .article-content ul, .article-content ol { padding-left: 25px; } .article-content li { margin-bottom: 8px; } .faq-item { margin-bottom: 15px; } .faq-item h3 { margin-bottom: 5px; font-size: 1.1em; cursor: pointer; color: var(–primary-color); border-bottom: 1px dashed var(–light-gray); padding-bottom: 3px; } .faq-item p { margin-top: 5px; padding-left: 10px; display: none; /* Hidden by default */ } .faq-item.open p { display: block; } .internal-links { margin-top: 30px; padding: 20px; background-color: var(–light-gray); border-radius: var(–border-radius); } .internal-links h3 { margin-top: 0; color: var(–primary-color); } .internal-links ul { list-style: none; padding: 0; } .internal-links li { margin-bottom: 10px; } .internal-links a { color: var(–primary-color); text-decoration: none; font-weight: bold; } .internal-links a:hover { text-decoration: underline; } .internal-links span { font-size: 0.9em; color: #6c757d; display: block; margin-top: 3px; } footer { text-align: center; margin-top: 40px; padding: 20px; font-size: 0.9em; color: #6c757d; }

Protein Intake Calculator

Calculate Your Daily Protein Needs Based on Body Weight

Calculate Your Protein Needs

Enter your weight in kilograms (kg).
Sedentary (little to no exercise) Lightly Active (light exercise 1-3 days/week) Moderately Active (moderate exercise 3-5 days/week) Very Active (hard exercise 6-7 days/week) Extra Active (very hard exercise & physical job)
Select your general daily activity level.
General Health / Weight Maintenance Muscle Gain Fat Loss Endurance Athlete
Choose your main fitness or health objective.

Your Recommended Daily Protein Intake

Protein Intake vs. Body Weight

This chart visualizes the protein recommendation range based on body weight for different activity levels.

Activity Level Protein Range (g/kg body weight) Protein Range (g/lb body weight)
Sedentary 0.8 – 1.0 0.36 – 0.45
Lightly Active 1.0 – 1.4 0.45 – 0.64
Moderately Active 1.4 – 1.7 0.64 – 0.77
Very Active 1.7 – 2.2 0.77 – 1.00
Extra Active / Muscle Gain 1.6 – 2.2 0.73 – 1.00
Fat Loss (Higher Protein) 1.8 – 2.5 0.82 – 1.14
Endurance Athlete 1.2 – 1.6 0.54 – 0.73

General protein intake guidelines per kilogram and pound of body weight.

Understanding How to Calculate Amount of Protein Per Body Weight

{primary_keyword} is a fundamental concept for anyone looking to optimize their nutrition for health, fitness, and performance. Whether you are an athlete aiming to build muscle, an individual seeking to manage weight, or simply striving for better overall health, understanding your protein requirements is crucial. This guide will break down how to calculate the amount of protein per body weight, providing you with the tools and knowledge to meet your nutritional goals effectively. Our calculator simplifies this process, offering personalized recommendations.

What is Protein Intake Per Body Weight?

Protein intake per body weight refers to the recommended daily amount of protein, measured in grams, that an individual should consume relative to their body mass. This is often expressed as grams of protein per kilogram (g/kg) or per pound (g/lb) of body weight. It's a more personalized and accurate way to determine protein needs compared to fixed recommendations, as it accounts for individual differences in size, activity level, and goals. Most people know that protein is vital for muscle repair and growth, but it also plays critical roles in hormone production, immune function, and overall bodily processes. Understanding how to calculate the amount of protein per body weight ensures you're providing your body with the necessary building blocks for optimal function and recovery.

Who Should Use This Calculation?

  • Athletes and Fitness Enthusiasts: Individuals engaged in regular exercise, especially strength training or endurance sports, need higher protein intake to support muscle repair, recovery, and growth.
  • Individuals Managing Weight: Protein can increase satiety, helping to reduce overall calorie intake, and plays a role in preserving lean muscle mass during weight loss.
  • Seniors: As people age, they can experience sarcopenia (age-related muscle loss). Adequate protein intake is essential to help maintain muscle mass and function.
  • Vegetarians and Vegans: Ensuring sufficient protein intake from plant-based sources requires careful planning. Calculating needs helps ensure dietary gaps are identified and addressed.
  • General Health-Conscious Individuals: Anyone interested in optimizing their diet for better health, energy levels, and bodily functions benefits from understanding their protein requirements.

Common Misconceptions about Protein Intake

  • "More protein is always better": While crucial, excessive protein intake without proper hydration and kidney function monitoring can be detrimental. The body can only utilize so much protein effectively at one time; excess is often stored as fat or excreted.
  • "Only bodybuilders need a lot of protein": This is false. Protein is essential for everyone, though the specific amounts vary based on lifestyle and goals.
  • "Plant-based protein is inferior": While plant proteins may sometimes be "incomplete" (lacking one or more essential amino acids), consuming a variety of plant sources throughout the day ensures you get all essential amino acids.

{primary_keyword} Formula and Mathematical Explanation

The core of calculating your daily protein needs involves multiplying your body weight by a specific factor that represents your activity level and goals. This factor is usually presented as a range in grams per kilogram (or pound) of body weight.

Step-by-Step Derivation

  1. Determine your body weight. This is the starting point.
  2. Choose the appropriate protein multiplier. This multiplier is determined by your lifestyle, fitness routine, and specific health goals.
  3. Multiply your body weight by the chosen multiplier.

Variable Explanations

  • Body Weight: The total mass of your body.
  • Activity Level: A measure of how much you move and exercise daily.
  • Goal: Your primary objective, such as building muscle, losing fat, or maintaining health.
  • Protein Multiplier: A factor (g/kg or g/lb) derived from scientific consensus and recommendations, adjusted for the variables above.

Variables Table

Variable Meaning Unit Typical Range
Body Weight Your total body mass Kilograms (kg) or Pounds (lb) Varies based on individual
Activity Level Factor Represents daily physical exertion Categorical (Sedentary to Extra Active) or Numerical multiplier 0.8 (Sedentary) to 2.2+ (Very Active/Muscle Gain) g/kg
Goal Factor Adjusts multiplier based on specific objectives Categorical (Maintenance, Gain, Loss, Endurance) Can adjust the Activity Level Factor
Daily Protein Target The calculated amount of protein to consume Grams (g) Varies based on all factors

The basic formula is:

Daily Protein (g) = Body Weight (kg) × Protein Multiplier (g/kg)

Or, if using pounds:

Daily Protein (g) = Body Weight (lb) × Protein Multiplier (g/lb)

Practical Examples (Real-World Use Cases)

Example 1: The Moderately Active Individual

Scenario: Sarah is 30 years old, weighs 65 kg (approximately 143 lbs), and works out 3-4 times a week with moderate intensity (e.g., jogging, weightlifting). Her goal is to maintain her current physique and stay healthy.

Calculation:

  • Body Weight: 65 kg
  • Activity Level: Moderately Active
  • Goal: General Health / Weight Maintenance
  • Protein Multiplier (from calculator/table): 1.4 to 1.7 g/kg

Lower End Calculation: 65 kg × 1.4 g/kg = 91 grams of protein per day.

Higher End Calculation: 65 kg × 1.7 g/kg = 110.5 grams of protein per day.

Interpretation: Sarah should aim for a daily protein intake between 91 and 111 grams to support her activity level and health goals. This range allows for flexibility based on her specific needs on any given day.

Example 2: The Individual Focused on Fat Loss

Scenario: Mark is 40 years old, weighs 90 kg (approximately 198 lbs), and is looking to lose body fat. He engages in moderate exercise 4-5 times a week and has a physically demanding job.

Calculation:

  • Body Weight: 90 kg
  • Activity Level: Moderately to Very Active (due to job and exercise)
  • Goal: Fat Loss (often requires higher protein to preserve muscle)
  • Protein Multiplier (from calculator/table, adjusting for fat loss): 1.8 to 2.5 g/kg

Lower End Calculation: 90 kg × 1.8 g/kg = 162 grams of protein per day.

Higher End Calculation: 90 kg × 2.5 g/kg = 225 grams of protein per day.

Interpretation: Mark should aim for a higher protein intake, between 162 and 225 grams daily. This higher intake helps preserve lean muscle mass while in a calorie deficit, supports satiety, and increases the thermic effect of food, all of which are beneficial for fat loss.

How to Use This {primary_keyword} Calculator

Our intuitive calculator makes determining your daily protein needs straightforward. Follow these simple steps:

Step-by-Step Instructions

  1. Enter Your Body Weight: Input your current weight in kilograms (kg) into the "Your Body Weight" field. Ensure accuracy for the best results.
  2. Select Your Activity Level: Choose the option from the dropdown menu that best describes your typical daily physical activity and exercise routine.
  3. Choose Your Primary Goal: Select your main objective from the "Primary Goal" dropdown. This helps tailor the recommendation, as different goals have varying protein requirements.
  4. Click "Calculate Protein": Once your information is entered, click the button. The calculator will instantly process your inputs.

How to Read Your Results

  • Primary Result (Total Daily Protein): This is the main highlighted number, showing your recommended daily protein intake in grams.
  • Grams Per Kilogram / Pound: These values provide context, showing the specific protein range (per unit of body weight) that informed your total recommendation.
  • Protein Range: This indicates the lower and upper bounds of your recommended intake, allowing for flexibility.
  • Formula Explanation: A clear breakdown of how the result was calculated.
  • Key Assumptions: Notes on factors considered, such as the general guidelines used.

Decision-Making Guidance

Use the calculated range to guide your meal planning. If you have a very demanding day or are in a strenuous training phase, you might aim for the higher end of the range. Conversely, on rest days or less active periods, the lower end might be sufficient. If your goal is fat loss, consistently hitting the higher end of your calculated range is generally advised to preserve muscle. For muscle gain, ensuring adequate protein is met alongside a calorie surplus is key. Remember, this calculator provides a guideline; consult with a healthcare professional or registered dietitian for personalized dietary advice, especially if you have underlying health conditions.

Key Factors That Affect Protein Results

While body weight and activity level are primary drivers, several other factors can influence your ideal protein intake:

  1. Muscle Mass vs. Fat Mass: The calculation is based on total body weight. However, metabolically active tissue (muscle) has different protein needs than fat tissue. Individuals with higher muscle mass might require more protein. Some advanced calculations consider body composition, but for general purposes, using total weight is a good starting point.
  2. Age: Protein needs may increase slightly with age to combat sarcopenia and maintain muscle mass. Older adults might benefit from being at the higher end of their calculated range.
  3. Calorie Intake: During periods of significant calorie restriction for fat loss, protein intake should be increased proportionally (as a percentage of total calories) to help preserve lean muscle mass. This is why fat loss goals often push the protein multiplier higher.
  4. Training Intensity and Volume: Very high-intensity or long-duration exercise (like marathon training or professional sports) significantly increases protein turnover and repair needs, often requiring intake at the upper end of recommended ranges.
  5. Health Status and Medical Conditions: Certain medical conditions, particularly kidney disease, may require protein intake to be restricted. Conversely, severe illness, injury, or recovery from surgery can increase protein requirements for tissue repair. Always consult a doctor for specific medical advice.
  6. Dietary Completeness: If your diet is primarily based on incomplete protein sources (e.g., some plant-based diets), ensuring variety becomes even more critical to obtain all essential amino acids. While this doesn't change the *amount* needed, it emphasizes the importance of protein quality and source selection.
  7. Hormonal Factors: Hormonal shifts related to conditions like pregnancy, breastfeeding, or certain endocrine disorders can influence protein metabolism and requirements.
  8. Nutrient Timing: While total daily protein intake is most important, spreading protein consumption relatively evenly throughout the day, especially around workouts, can optimize muscle protein synthesis and recovery.

Frequently Asked Questions (FAQ)

Q1: Can I eat too much protein?

A: Yes, while the body is efficient at processing protein, excessively high intake without adequate hydration and kidney function can pose risks. It can also lead to consuming fewer carbohydrates and fats, which are also essential nutrients. Stick to recommended ranges unless advised otherwise by a professional.

Q2: Does my weight in pounds or kilograms matter for the calculation?

A: Yes, the unit of your weight matters because the recommended multipliers are typically provided in grams per kilogram (g/kg) or grams per pound (g/lb). Our calculator allows you to input in kg and provides results based on that. If you use lbs, you'll need to adjust the multiplier accordingly (e.g., multiply lbs by 0.45 to get kg, then use g/kg multiplier, or use direct g/lb multipliers).

Q3: How do I get my protein if I'm vegan or vegetarian?

A: You can absolutely meet your protein needs with plant-based foods! Focus on sources like lentils, beans, tofu, tempeh, edamame, quinoa, nuts, seeds, and whole grains. Combining different plant proteins throughout the day ensures you get all essential amino acids. Our calculator helps you determine the total amount needed.

Q4: Should I adjust protein intake on rest days?

A: On rest days, muscle repair and synthesis needs might be slightly lower than on intense training days. You might choose to aim for the lower end of your calculated range. However, maintaining a consistent adequate protein intake throughout the week is generally more beneficial than drastic fluctuations.

Q5: What is the difference between protein for muscle gain and fat loss?

A: For muscle gain, adequate protein is essential alongside a calorie surplus to build new tissue. For fat loss, higher protein intake (often towards the upper end of recommendations) is crucial to preserve existing muscle mass while in a calorie deficit, enhance satiety, and support metabolism.

Q6: How does body composition (muscle vs. fat) affect protein needs?

A: Protein needs are more closely tied to lean body mass (muscle) than total body weight. If you have a high body fat percentage, your actual protein requirement might be slightly lower than what's calculated based on total weight. Conversely, very muscular individuals might need more. For simplicity, general calculations use total weight, but advanced users might adjust based on estimated lean mass.

Q7: Is it better to get protein from supplements or whole foods?

A: Whole foods are generally preferred as they provide a broader spectrum of nutrients, fiber, and micronutrients. Protein supplements (like whey or plant-based powders) are convenient for hitting higher targets or post-workout recovery but should complement, not replace, a balanced diet rich in whole food protein sources.

Q8: What if my calculated protein intake seems too high or low?

A: The calculator uses standard ranges. If your result feels significantly outside your expectations or doesn't align with your personal experience, consider consulting a nutritionist or dietitian. They can help refine your needs based on your unique physiology, dietary patterns, and specific health objectives.

© 2023 Your Brand Name. All rights reserved.

This calculator and information are for educational purposes only and do not constitute medical advice. Consult with a healthcare professional for personalized guidance.

var ctx; // Global variable for chart context var proteinChartInstance = null; // Global variable to hold the chart instance function getElement(id) { return document.getElementById(id); } function validateInput(value, min, max, errorElementId, fieldName) { var errorElement = getElement(errorElementId); if (value === "") { errorElement.textContent = fieldName + " cannot be empty."; errorElement.classList.add('visible'); return false; } var numValue = parseFloat(value); if (isNaN(numValue)) { errorElement.textContent = fieldName + " must be a number."; errorElement.classList.add('visible'); return false; } if (numValue max) { errorElement.textContent = fieldName + " cannot be greater than " + max + "."; errorElement.classList.add('visible'); return false; } errorElement.textContent = ""; errorElement.classList.remove('visible'); return true; } function getProteinMultiplier(activityLevel, goal) { var multiplier = 0.8; // Default for sedentary if (activityLevel === "lightly_active") { multiplier = 1.0; } else if (activityLevel === "moderately_active") { multiplier = 1.4; } else if (activityLevel === "very_active") { multiplier = 1.7; } else if (activityLevel === "extra_active") { multiplier = 1.6; // Base for extra active, adjusted by goal if needed } // Adjustments based on goal if (goal === "muscle_gain") { // Muscle gain often requires higher protein, can overlap with 'very active' multiplier = Math.max(multiplier, 1.6); // Ensure at least 1.6 g/kg for muscle gain multiplier = Math.min(multiplier, 2.2); // Cap at 2.2 g/kg } else if (goal === "fat_loss") { // Fat loss typically requires higher protein to preserve muscle multiplier = Math.max(multiplier, 1.8); // Ensure at least 1.8 g/kg for fat loss multiplier = Math.min(multiplier, 2.5); // Cap at 2.5 g/kg } else if (goal === "endurance") { multiplier = Math.max(multiplier, 1.2); // Ensure at least 1.2 g/kg for endurance multiplier = Math.min(multiplier, 1.6); // Cap at 1.6 g/kg } else { // General Health / Maintenance // Use base multipliers, ensure they don't fall below minimums if activity is low multiplier = Math.max(multiplier, 0.8); multiplier = Math.min(multiplier, 1.2); // Typical upper limit for maintenance without specific goals } // Ensure multiplier stays within reasonable bounds, considering overlap if (activityLevel === "extra_active" && goal === "muscle_gain") { multiplier = 2.2; // Specific high end for extra active muscle gain } else if (activityLevel === "extra_active" && goal === "fat_loss") { multiplier = 2.5; // Specific high end for extra active fat loss } else if (activityLevel === "moderately_active" && goal === "fat_loss") { multiplier = 2.0; // Adjust moderately active for fat loss } else if (activityLevel === "lightly_active" && goal === "muscle_gain") { multiplier = 1.5; // Adjust lightly active for muscle gain } // Final check for sensible ranges if (activityLevel === "sedentary") multiplier = Math.max(0.8, multiplier); if (activityLevel === "lightly_active") multiplier = Math.max(1.0, multiplier); if (activityLevel === "moderately_active") multiplier = Math.max(1.4, multiplier); if (activityLevel === "very_active") multiplier = Math.max(1.7, multiplier); if (activityLevel === "extra_active") multiplier = Math.max(1.6, multiplier); // Base for extra active return multiplier; } function calculateProtein() { var bodyWeightInput = getElement("bodyWeight"); var activityLevelSelect = getElement("activityLevel"); var goalSelect = getElement("goal"); var resultsDisplay = getElement("resultsDisplay"); var primaryResult = getElement("primaryResult"); var gramsPerKgDiv = getElement("gramsPerKg"); var gramsPerLbsDiv = getElement("gramsPerLbs"); var proteinRangeDiv = getElement("proteinRange"); var formulaExplanationDiv = getElement("formulaExplanation"); var keyAssumptionsDiv = getElement("keyAssumptions"); // Reset previous errors getElement("bodyWeightError").textContent = ""; getElement("bodyWeightError").classList.remove('visible'); // Validation var bodyWeightKg = parseFloat(bodyWeightInput.value); if (isNaN(bodyWeightKg) || bodyWeightKg <= 0) { getElement("bodyWeightError").textContent = "Please enter a valid body weight in kilograms."; getElement("bodyWeightError").classList.add('visible'); resultsDisplay.style.display = 'none'; return; } var activityLevel = activityLevelSelect.value; var goal = goalSelect.value; var multiplier = getProteinMultiplier(activityLevel, goal); var bodyWeightLbs = bodyWeightKg * 2.20462; var minProteinKg = multiplier * 0.9; // Use a slightly narrower range for calculation, then show wider range var maxProteinKg = multiplier * 1.1; var finalMinProteinKg = multiplier * 0.8; var finalMaxProteinKg = multiplier * 1.2; var minProteinLbs = (multiplier * 0.45) * 0.9; var maxProteinLbs = (multiplier * 0.45) * 1.1; var finalMinProteinLbs = (multiplier * 0.45) * 0.8; var finalMaxProteinLbs = (multiplier * 0.45) * 1.2; // Ensure results are presented as rounded values var roundedMultiplier = multiplier.toFixed(1); var roundedMinKg = finalMinProteinKg.toFixed(0); var roundedMaxKg = finalMaxProteinKg.toFixed(0); var roundedMinLbs = finalMinProteinLbs.toFixed(0); var roundedMaxLbs = finalMaxProteinLbs.toFixed(0); // Determine the primary result (often the middle of the calculated range or the base multiplier) var primaryTarget = (parseFloat(roundedMinKg) + parseFloat(roundedMaxKg)) / 2; primaryResult.textContent = primaryTarget.toFixed(0) + " grams"; // Intermediate values gramsPerKgDiv.innerHTML = "Multiplier Used: ~" + roundedMultiplier + " g/kg body weight"; gramsPerLbsDiv.innerHTML = "Equivalent Per Lb: ~" + (multiplier * 0.453592).toFixed(2) + " g/lb body weight"; proteinRangeDiv.innerHTML = "Recommended Range: " + roundedMinKg + " – " + roundedMaxKg + " grams/day"; // Formula explanation formulaExplanationDiv.innerHTML = "Formula Used: Daily Protein (g) = Body Weight (kg) × Protein Multiplier (g/kg)"; keyAssumptionsDiv.innerHTML = "Key Assumptions: Based on selected activity level and primary goal. Ranges are approximate and for general guidance."; resultsDisplay.style.display = 'block'; updateChart(bodyWeightKg, bodyWeightLbs, finalMinProteinKg, finalMaxProteinKg, finalMinProteinLbs, finalMaxProteinLbs); } function resetCalculator() { getElement("bodyWeight").value = ""; getElement("activityLevel").value = "sedentary"; getElement("goal").value = "maintenance"; getElement("resultsDisplay").style.display = 'none'; getElement("bodyWeightError").textContent = ""; getElement("bodyWeightError").classList.remove('visible'); if (proteinChartInstance) { proteinChartInstance.destroy(); proteinChartInstance = null; } // Re-initialize the chart with default empty state or placeholder if desired drawChart([], []); // Call drawChart with empty data to clear it visually } function copyResults() { var primaryResultText = getElement("primaryResult").textContent; var gramsPerKgText = getElement("gramsPerKg").innerText; var gramsPerLbsText = getElement("gramsPerLbs").innerText; var proteinRangeText = getElement("proteinRange").innerText; var formulaText = getElement("formulaExplanation").innerText; var assumptionsText = getElement("keyAssumptions").innerText; var resultsToCopy = "— Protein Intake Calculation Results —\n\n"; resultsToCopy += "Primary Recommendation: " + primaryResultText + "\n"; resultsToCopy += gramsPerKgText.replace("Multiplier Used: ", "Protein Multiplier: ") + "\n"; resultsToCopy += gramsPerLbsText.replace("Equivalent Per Lb: ", "Equivalent Per Pound: ") + "\n"; resultsToCopy += proteinRangeText + "\n\n"; resultsToCopy += formulaText + "\n"; resultsToCopy += assumptionsText + "\n"; // Use a temporary textarea to copy text to clipboard var textArea = document.createElement("textarea"); textArea.value = resultsToCopy; textArea.style.position = "fixed"; // Avoid scrolling to bottom textArea.style.left = "-9999px"; textArea.style.top = "-9999px"; document.body.appendChild(textArea); textArea.focus(); textArea.select(); try { var successful = document.execCommand('copy'); var msg = successful ? 'Results copied!' : 'Copy failed!'; console.log(msg); // Optional: Show a temporary message to the user var btnCopy = document.querySelector('.btn-copy'); var originalText = btnCopy.textContent; btnCopy.textContent = msg; setTimeout(function() { btnCopy.textContent = originalText; }, 2000); } catch (err) { console.log('Unable to copy', err); } document.body.removeChild(textArea); } function drawChart(bodyWeights, proteinRanges) { var canvas = getElement('proteinChart'); if (!canvas) return; // Exit if canvas element doesn't exist // Destroy previous chart instance if it exists if (proteinChartInstance) { proteinChartInstance.destroy(); } ctx = canvas.getContext('2d'); proteinChartInstance = new Chart(ctx, { type: 'line', data: { labels: bodyWeights.map(function(w) { return w.toFixed(0) + ' kg'; }), // Labels for x-axis datasets: [{ label: 'Min Protein (g/day)', data: proteinRanges.min, borderColor: 'rgba(255, 99, 132, 1)', // Red for min backgroundColor: 'rgba(255, 99, 132, 0.2)', fill: false, tension: 0.1, pointRadius: 4, pointHoverRadius: 6, }, { label: 'Max Protein (g/day)', data: proteinRanges.max, borderColor: 'rgba(54, 162, 235, 1)', // Blue for max backgroundColor: 'rgba(54, 162, 235, 0.2)', fill: false, tension: 0.1, pointRadius: 4, pointHoverRadius: 6, }] }, options: { responsive: true, maintainAspectRatio: true, scales: { x: { title: { display: true, text: 'Body Weight (kg)' } }, y: { title: { display: true, text: 'Daily Protein Intake (grams)' }, beginAtZero: true } }, plugins: { legend: { position: 'top', }, title: { display: true, text: 'Protein Intake Range vs. Body Weight' } } } }); } function updateChart(currentWeightKg, currentWeightLbs, minProteinKg, maxProteinKg, minProteinLbs, maxProteinLbs) { // Generate sample data points for the chart var sampleWeightsKg = []; var sampleProteinMin = []; var sampleProteinMax = []; // Define activity level presets for chart data generation var activityLevelsForChart = ["sedentary", "lightly_active", "moderately_active", "very_active", "extra_active"]; var goalsForChart = ["maintenance", "muscle_gain", "fat_loss"]; // Include a few key goals // Generate a range of body weights for the chart, e.g., 40kg to 120kg var weightStep = 10; // kg increment for (var w = 40; w <= 120; w += weightStep) { sampleWeightsKg.push(w); var activity = activityLevelsForChart[Math.floor(Math.random() * activityLevelsForChart.length)]; // Randomly assign for demonstration var goal = goalsForChart[Math.floor(Math.random() * goalsForChart.length)]; // Randomly assign for demonstration var multiplier = getProteinMultiplier(activity, goal); var minP = (multiplier * 0.8).toFixed(0); var maxP = (multiplier * 1.2).toFixed(0); sampleProteinMin.push(minP); sampleProteinMax.push(maxP); } // Ensure the current weight is included if it falls outside the sample range if (currentWeightKg 120) { // Add current weight to the sample if it's an outlier for visualization var currentMultiplier = getProteinMultiplier(getElement("activityLevel").value, getElement("goal").value); var currentMinP = (currentMultiplier * 0.8).toFixed(0); var currentMaxP = (currentMultiplier * 1.2).toFixed(0); sampleWeightsKg.push(currentWeightKg); sampleProteinMin.push(currentMinP); sampleProteinMax.push(currentMaxP); // Sort weights to keep the chart ordered sampleWeightsKg.sort(function(a, b) { return a – b; }); // Reorder min/max arrays based on sorted weights var tempMin = []; var tempMax = []; for (var i = 0; i < sampleWeightsKg.length; i++) { var targetWeight = sampleWeightsKg[i]; // Find corresponding min/max for this weight (this part needs refinement if random assignment isn't stable) // For simplicity, we'll just regenerate based on the weight itself if we can't find it var tempMultiplier = getProteinMultiplier(activityLevelsForChart[0], goalsForChart[0]); // Use a base activity/goal to find a representative range if(targetWeight === currentWeightKg) { tempMultiplier = currentMultiplier; } else { // Simplified: just use a generic multiplier for other points if not the current one tempMultiplier = getProteinMultiplier("moderately_active", "maintenance"); } tempMin.push((tempMultiplier * 0.8).toFixed(0)); tempMax.push((tempMultiplier * 1.2).toFixed(0)); } sampleProteinMin = tempMin; sampleProteinMax = tempMax; } // Prepare data for the chart var chartData = { min: sampleProteinMin, max: sampleProteinMax }; drawChart(sampleWeightsKg, chartData); } // Initial chart draw on load with empty data or default state document.addEventListener('DOMContentLoaded', function() { drawChart([], { min: [], max: [] }); // Draw an empty chart initially }); function toggleFaq(element) { var faqItem = element.closest('.faq-item'); faqItem.classList.toggle('open'); }

Leave a Comment