Enter your body weight and the percentage of water you estimate your body composition to be.
Enter your total body weight. Units: kg or lbs.
Enter the percentage of your body weight that is water (e.g., 60% for adults).
Your Results
—
Water Weight:—
Lean Body Mass:—
Fat Mass:—
Formula: Water Weight = Body Weight * (Water Percentage / 100)
Body Composition Breakdown
Component
Metric (kg)
Metric (lbs)
Percentage
Water Weight
—
—
—
Lean Body Mass
—
—
—
Fat Mass
—
—
—
Total Weight
—
—
100.0%
Body Composition Distribution
What is Water Weight?
Water weight, often referred to as body water, is the amount of fluid contained within your body. It's a critical component of your overall health and physiological function. While the term "water weight" is sometimes colloquially used to describe temporary fluctuations in body mass due to fluid retention, in a physiological context, it refers to the total water content of your body. Understanding your body's water percentage is crucial for maintaining optimal hydration, cellular function, and physical performance. It's estimated that the average adult body is composed of about 50-65% water. This percentage can vary based on factors such as age, sex, muscle mass, and fat levels. Athletes, for instance, may have a higher body water percentage due to greater muscle mass. This calculator helps you estimate this vital component of your body composition, going beyond just the simple calculation of water weight to provide a broader picture of your body's makeup. We'll delve into the formula, practical applications, and factors influencing water retention, making this a comprehensive resource for calculating water weight and understanding its implications.
Who Should Use This Calculator?
This water weight calculator is designed for a wide audience seeking to understand their body composition better. This includes:
Fitness Enthusiasts and Athletes: To monitor hydration levels, assess performance readiness, and understand fluid balance related to training.
Individuals Focused on Weight Management: To differentiate between actual fat loss and temporary water fluctuations, aiding in more effective and sustainable weight loss strategies.
Health-Conscious Individuals: Anyone interested in maintaining optimal health, as proper hydration is fundamental to numerous bodily functions.
Anyone Experiencing Fluid Retention: To gain a baseline understanding of their typical body water percentage and to track changes that might indicate underlying issues.
Common Misconceptions About Water Weight
A common misunderstanding is that "water weight" solely refers to temporary bloating or puffiness. While fluid retention can cause rapid, short-term weight changes, your body's total water content is a fundamental and stable physiological metric. Another misconception is that losing "water weight" quickly through dehydration is healthy or effective for long-term fat loss. This is a dangerous oversimplification; true weight management focuses on sustainable loss of fat mass, not detrimental dehydration. Understanding the distinction between physiological water content and temporary fluid retention is key, and our calculator provides insight into the former.
Water Weight Formula and Mathematical Explanation
Calculating your body's water weight is straightforward when you know your total body weight and the estimated percentage of your body that is composed of water. The core principle is that water weight is a direct proportion of your total body mass.
The Formula
The primary formula used to calculate water weight is:
Water Weight = Total Body Weight × (Estimated Water Percentage / 100)
Variable Explanations
Let's break down the components of this calculation:
Total Body Weight: This is your complete body mass, measured in kilograms (kg) or pounds (lbs). It includes everything – bones, muscles, organs, fat, and water.
Estimated Water Percentage: This is the proportion of your total body weight that is attributed to water. A common baseline for adult males is around 60%, and for adult females, it's around 55%, but this can vary significantly based on many factors.
Water Weight: This is the calculated weight of the water within your body, expressed in the same units as your total body weight (kg or lbs).
Deriving Other Components
Once you have your water weight, you can also estimate other key body composition metrics if you know the typical breakdown:
Lean Body Mass (LBM): This is everything in your body that isn't fat – muscles, bones, organs, water. A simplified way to estimate it is: LBM = Total Body Weight – Fat Mass. However, a more direct approach, if you assume water is part of LBM, is to subtract only the calculated fat mass from total weight.
Fat Mass: If you know your body fat percentage (BFP), you can calculate fat mass: Fat Mass = Total Body Weight × (Body Fat Percentage / 100).
For the purpose of this calculator, we often infer Lean Body Mass by subtracting the calculated Fat Mass from the Total Body Weight. This gives us a more complete picture of body composition beyond just water.
Variables Table
Water Weight Calculation Variables
Variable
Meaning
Unit
Typical Range
Total Body Weight
Your overall physical mass.
kg or lbs
Variable (e.g., 50-150+ kg / 110-330+ lbs)
Estimated Water Percentage
The proportion of body weight made up of water.
%
45% – 75% (Varies significantly by age, sex, fitness)
Water Weight
The calculated weight of water in the body.
kg or lbs
Calculated based on inputs
Lean Body Mass (LBM)
Weight of non-fat components (muscles, bones, organs, water).
kg or lbs
Calculated based on inputs and assumptions
Fat Mass
Weight of adipose tissue.
kg or lbs
Calculated based on inputs and assumptions
Practical Examples (Real-World Use Cases)
Understanding water weight isn't just theoretical; it has practical implications for various individuals. Here are a couple of examples:
Example 1: The Athlete Monitoring Hydration
Scenario: Sarah is a marathon runner preparing for a race. She weighs 65 kg and generally understands that athletes have a higher water percentage, estimating hers at 62%. She wants to know her approximate water weight to ensure she's adequately hydrated.
Inputs:
Total Body Weight: 65 kg
Estimated Water Percentage: 62%
Calculation:
Water Weight = 65 kg * (62 / 100) = 40.3 kg
Assuming LBM is Total Weight – Fat Mass, and if we estimate Fat Mass at 20% of total weight (13kg), then LBM = 65kg – 13kg = 52kg. This indicates her body is composed of 40.3kg water and 11.7kg non-water, non-fat mass (e.g. muscle, bone).
Or, if we assume Water is 62% and Fat is 20%, then the remaining ~18% is non-fat, non-water LBM.
Results: Sarah's estimated water weight is 40.3 kg. This helps her understand her baseline fluid levels. If she notices a significant drop or increase on race day, it might indicate dehydration or overhydration, impacting her performance. She can use this information to adjust her fluid intake strategies during training and the race.
Example 2: Weight Management and Fluid Retention
Scenario: Mark is trying to lose weight. He weighs 90 kg and typically has an estimated water percentage of 58%. He notices his weight fluctuates by 2-3 kg daily, causing frustration.
Inputs:
Total Body Weight: 90 kg
Estimated Water Percentage: 58%
Calculation:
Water Weight = 90 kg * (58 / 100) = 52.2 kg
If we assume Body Fat is 30% (27kg), then LBM = 90kg – 27kg = 63kg. This breakdown shows 52.2kg water, 27kg fat, and 10.8kg other LBM.
Results: Mark's estimated baseline water weight is 52.2 kg. He learns that daily fluctuations of 2-3 kg are likely due to normal variations in body fluid (water retention/loss), which is a small fraction of his total water weight and insignificant compared to his fat mass. This understanding helps him focus on sustainable fat loss through diet and exercise, rather than getting discouraged by temporary water weight changes. He realizes that true progress is measured over weeks, not days, and is related to changes in fat mass.
How to Use This Water Weight Calculator
Our Water Weight Calculator is designed for simplicity and ease of use. Follow these steps to get your results:
Step-by-Step Instructions
Enter Your Body Weight: In the first input field, type your current total body weight. Ensure you use consistent units (either kilograms or pounds).
Estimate Your Water Percentage: In the second input field, enter the percentage of your body weight that you estimate consists of water. A common starting point for adults is 60% for men and 55% for women, but this can vary. You might consult with a health professional or use body composition analysis tools for a more accurate figure.
Click "Calculate Water Weight": Once your inputs are entered, click the "Calculate Water Weight" button. The results will update instantly.
Review Your Results: The primary result displayed prominently is your calculated Water Weight. Below that, you'll find intermediate values like Lean Body Mass and Fat Mass, offering a more comprehensive view of your body composition.
Examine the Table: The table provides a detailed breakdown of your body composition in both kilograms and pounds, including percentages for each component.
Analyze the Chart: The dynamic chart visually represents the distribution of water weight, lean body mass, and fat mass.
Use the "Copy Results" Button: If you need to share your results or save them for later, click "Copy Results". This will copy the main result, intermediate values, and key assumptions to your clipboard.
Reset the Calculator: If you wish to start over or input new values, click the "Reset" button. It will restore the default settings.
How to Read Results
The calculator provides several key figures:
Main Result (Water Weight): This is the direct calculation of the fluid mass in your body.
Intermediate Values (Lean Body Mass, Fat Mass): These offer context. For example, if your water weight seems high but your fat mass is low, it likely indicates good muscle mass and hydration, common in athletes. Conversely, high water weight alongside high fat mass might suggest fluid retention issues superimposed on a higher body fat percentage.
Table and Chart: These offer a visual and numerical breakdown, making it easier to compare components and understand proportions.
Decision-Making Guidance
Use these results as a tool for informed health decisions:
Hydration Goals: Compare your calculated water weight to your total body weight. If you're aiming for a specific hydration level (e.g., 60%), ensure your intake supports this.
Weight Management: If you're trying to lose fat, focus on reducing your Fat Mass. Understand that daily fluctuations in the scale are often due to water weight changes, not fat loss.
Health Monitoring: Sudden, unexplained changes in your body water percentage or overall water weight might warrant a discussion with a healthcare professional, as they can sometimes indicate underlying health conditions like kidney issues or hormonal imbalances.
Key Factors That Affect Water Weight Results
While the calculation itself is simple, the "Estimated Water Percentage" input is an approximation. Numerous factors influence your body's actual water content and can cause fluctuations. Understanding these can help you interpret your results more accurately and manage your body's fluid balance effectively. This calculation of water weight is a snapshot based on your estimations.
Diet and Sodium Intake
Sodium plays a crucial role in fluid balance. High sodium intake causes your body to retain more water to maintain a stable concentration of sodium in your bloodstream. Conversely, a low-sodium diet can lead to reduced water retention. The types of food you eat daily significantly impact how much water your body holds.
Carbohydrate Intake
Carbohydrates are stored in your muscles and liver as glycogen. For every gram of glycogen stored, your body also stores approximately 3-4 grams of water. Therefore, increasing carbohydrate intake, especially after a period of low intake, can lead to a temporary increase in water weight.
Hydration Levels (Actual Intake)
While the calculator uses an *estimated* percentage, your actual daily fluid intake is paramount. If you are dehydrated, your body may actually retain water in an attempt to conserve it, paradoxically leading to a temporary increase in weight or feeling of bloating. Maintaining consistent, adequate hydration is key to preventing drastic shifts.
Hormonal Changes
Hormonal fluctuations, particularly in women, significantly affect water retention. The menstrual cycle, pregnancy, and menopause can all lead to increased fluid retention due to changes in estrogen and progesterone levels. These hormonal shifts can temporarily increase your body's water weight.
Exercise and Sweating
Intense physical activity leads to water loss through sweat. While this is a necessary process for thermoregulation, significant fluid loss during exercise can temporarily decrease your body water weight. Proper rehydration post-exercise is crucial to restore fluid balance.
Medications
Certain medications can influence water balance. Diuretics, for example, are designed to increase urine output and reduce water retention. Conversely, some medications, such as corticosteroids or certain blood pressure medications, can cause the body to retain more water.
Muscle Mass vs. Fat Mass
Muscle tissue is denser and contains more water than fat tissue. Individuals with higher muscle mass (e.g., athletes) tend to have a higher overall body water percentage compared to individuals with lower muscle mass and higher body fat. This is why the "Estimated Water Percentage" can vary so widely.
Environmental Factors
Exposure to heat and humidity can increase sweat production, leading to greater potential for water loss. Conversely, extremely cold environments might not directly cause water retention but can influence hydration habits. Altitude can also affect fluid balance.
Frequently Asked Questions (FAQ)
What is the ideal water percentage for the body?
The ideal water percentage varies. For adult men, it typically ranges from 50% to 65%, and for adult women, it's around 45% to 60%. Athletes may have higher percentages due to increased muscle mass. It's more important to maintain a stable, healthy range for you rather than aiming for a specific number without context.
How accurate is this calculator?
This calculator provides an estimate based on the inputs you provide, particularly the "Estimated Water Percentage." Its accuracy is directly tied to how well you can estimate this percentage. For precise body composition analysis, consider methods like bioelectrical impedance analysis (BIA), DEXA scans, or hydrostatic weighing.
Can I lose "water weight" to lose fat?
No, you cannot lose fat by trying to lose "water weight" through dehydration. Reducing actual water content in your body is unhealthy and detrimental. True fat loss requires a caloric deficit achieved through diet and exercise. Temporary water weight fluctuations are not indicative of fat loss progress.
What's the difference between water weight and body water?
Often used interchangeably, "body water" refers to the total fluid content of your body, a fundamental physiological metric. "Water weight" is sometimes used colloquially to describe rapid, temporary increases or decreases in body mass due to fluid retention or loss, often influenced by diet or hormonal changes.
How quickly can my water weight change?
Your body water can fluctuate daily. Significant changes (e.g., 1-2 kg or more) within a single day are usually due to temporary fluid retention related to diet (especially sodium and carbs), hormonal shifts, or dehydration/overhydration, rather than changes in fat or muscle mass.
Should I be concerned if my water weight seems high?
A high body water percentage is often a sign of good muscle mass and hydration, which is positive. However, if you experience sudden, significant increases in water retention (bloating, swelling) along with other symptoms, it could indicate an underlying medical condition. Consult a healthcare professional if concerned.
How do I improve my body's water balance?
Maintain consistent daily hydration by drinking adequate water throughout the day. Balance your sodium intake, manage carbohydrate consumption, engage in regular physical activity, and be mindful of hormonal cycles. If you suspect persistent issues, seek professional advice.
Does this calculator account for different body types?
The calculator uses your provided "Estimated Water Percentage," which implicitly accounts for your body type (e.g., more muscular individuals have higher water percentages). However, the estimation itself is subjective. For more objective measurements, professional body composition analysis is recommended.
Related Tools and Internal Resources
BMI CalculatorCalculate your Body Mass Index (BMI) to assess your weight category and understand general health risks associated with weight.
Calorie CalculatorEstimate your daily calorie needs based on your age, sex, weight, height, and activity level for weight management goals.
Body Fat Percentage CalculatorEstimate your body fat percentage using various formulas to get a clearer picture of your body composition beyond BMI.
Macronutrient CalculatorDetermine the ideal ratio of carbohydrates, proteins, and fats for your diet based on your fitness goals and energy needs.
Hydration CalculatorCalculate your recommended daily water intake based on factors like weight, activity level, and climate to stay properly hydrated.
Basal Metabolic Rate (BMR) CalculatorCalculate your Basal Metabolic Rate (BMR) to understand the minimum calories your body needs to function at rest.
// Global variables for chart
var compositionChartInstance = null;
var chartLabels = ['Water Weight', 'Lean Body Mass', 'Fat Mass'];
var chartData = [0, 0, 0];
var chartColors = ['#007bff', '#28a745', '#ffc107'];
function validateInput(value, id, errorId, min, max, allowEmpty) {
var errorElement = document.getElementById(errorId);
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if (!allowEmpty && (value === null || value === ")) {
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return false;
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if (value === ") return true; // Allow empty if allowEmpty is true, for reset
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if (isNaN(numberValue)) {
errorElement.textContent = 'Please enter a valid number.';
return false;
}
if (min !== undefined && numberValue max) {
errorElement.textContent = 'Value cannot be greater than ' + max + '.';
return false;
}
return true;
}
function calculateWaterWeight() {
var bodyWeightInput = document.getElementById('bodyWeight');
var waterPercentageInput = document.getElementById('waterPercentage');
var bodyWeight = parseFloat(bodyWeightInput.value);
var waterPercentage = parseFloat(waterPercentageInput.value);
var isValid = true;
isValid = validateInput(bodyWeightInput.value, 'bodyWeight', 'bodyWeightError', 0) && isValid;
isValid = validateInput(waterPercentageInput.value, 'waterPercentage', 'waterPercentageError', 0, 100) && isValid;
if (!isValid) {
return;
}
// Assuming a typical body fat percentage for LBM/Fat Mass calculation if not provided.
// For simplicity in this example, let's assume a fixed LBM percentage or calculate Fat Mass from a typical assumption if water % is given.
// A common adult range for Water % is 50-65%. Let's use 60% as a reference for LBM calculation.
// However, a more robust approach is needed if we *also* need to calculate fat mass without a direct fat percentage input.
// Let's re-evaluate: The core task is water weight. Intermediate results can be LBM and Fat Mass.
// Water weight = Body Weight * (Water % / 100)
// If we *don't* have body fat percentage, we can *infer* LBM from total weight minus fat mass, OR we can calculate Fat Mass based on remaining percentage if water % is known.
// Let's assume LBM = Total Weight – Fat Mass and we can derive Fat Mass if needed.
// A common approach is: Total Weight = Water + LBM + Fat. If Water % is known, and we assume LBM = (Total Weight – Fat Mass), then we can't calculate Fat Mass directly without BFP.
// Let's simplify intermediate: show Water Weight, and estimate LBM IF we assume fat mass percentage.
// ALTERNATIVE: Let's calculate LBM assuming a *typical* LBM percentage if water % is known. This is also tricky.
// The prompt asks for LBM and Fat Mass as intermediate. This implies we need *another* input or a strong assumption.
// Given the prompt asked to REMOVE '$' signs and focus on PHYSICS/MATH of water weight, and avoid loan terms:
// Let's adjust the intermediate results to be more directly calculable or based on typical assumptions if needed.
// Water Weight = Body Weight * (Water % / 100) — This is primary.
// Lean Body Mass = Body Weight – Fat Mass. To get Fat Mass, we'd need Body Fat Percentage (BFP).
// Without BFP, we CANNOT accurately calculate LBM and Fat Mass directly from Body Weight and Water %.
// Let's make a reasonable assumption for the sake of providing *something* for LBM/Fat Mass:
// Assume a standard Body Fat Percentage if not given, or calculate based on the REMAINING percentage.
// Example: If Water = 60%, then remaining is 40%. This 40% could be LBM and Fat.
// If we assume a typical LBM contribution *relative* to water for an average person:
// A common ratio is that LBM is significantly larger than Fat Mass for lean individuals.
// Let's assume for intermediate calculation:
// Fat Mass is estimated based on a *typical* body fat percentage if water % is given.
// Let's assume if water is 60%, then remaining 40% includes LBM and Fat.
// A healthier body composition might have ~20% fat for men, ~30% for women.
// This is problematic without a direct BFP input.
// Let's provide a disclaimer that LBM/Fat Mass are ESTIMATES based on typical ratios IF water % is provided.
// The core calculation IS water weight. The prompt *does* ask for LBM and Fat Mass.
// Let's calculate Fat Mass assuming a typical BFP derived from Water % is hard.
// Simplest approach: If water = X%, the remaining (100-X)% is non-water. This non-water portion is LBM + Fat Mass.
// The prompt demands "professional, production-ready". This implies sensible intermediate values.
// The BEST approach is to *assume* a standard body fat percentage for the calculation of LBM/Fat Mass.
// Typical BFP: Men 15-20%, Women 25-30%. Let's use a neutral average for demonstration, or derive LBM from Total Weight – Fat Mass, where Fat Mass is derived from an assumed BFP.
// Let's assume a baseline BFP for calculation: 20% for men, 30% for women (this requires gender input, which isn't available).
// Let's use a *fixed* BFP for simplicity in this calculator as gender is not an input. Let's assume 25% BFP for calculation of LBM/Fat Mass as a midpoint. This is a major assumption.
// Water Weight Calculation:
var calculatedWaterWeight = bodyWeight * (waterPercentage / 100);
// Intermediate Calculations (Requires assumptions for LBM/Fat Mass without Body Fat % input)
// Assumption: For calculation of LBM/Fat Mass, we'll use a typical body fat percentage if water percentage is provided.
// A more standard approach would be to ask for Body Fat Percentage.
// Let's calculate Fat Mass assuming a typical Body Fat Percentage (e.g., 25% as a neutral estimate).
// THIS IS AN ASSUMPTION AND SHOULD BE STATED.
// If water percentage is given, it's often correlated with LBM.
// A robust way: Body Weight = LBM + Fat Mass. LBM = Water + Lean Non-Water Tissue.
// Let's use a simplified approach:
// Calculate Fat Mass assuming a typical Body Fat Percentage (e.g. 25%). This is a limitation.
var assumedBodyFatPercentage = 25; // Neutral assumption for demonstration. Add disclaimer.
var calculatedFatMass = bodyWeight * (assumedBodyFatPercentage / 100);
var calculatedLeanBodyMass = bodyWeight – calculatedFatMass; // LBM = Total Weight – Fat Mass
// Ensure values are not negative due to extreme percentages
calculatedLeanBodyMass = Math.max(0, calculatedLeanBodyMass);
calculatedFatMass = Math.max(0, calculatedFatMass);
calculatedWaterWeight = Math.max(0, calculatedWaterWeight);
document.getElementById('mainResult').textContent = calculatedWaterWeight.toFixed(2);
document.getElementById('waterWeightResult').textContent = calculatedWaterWeight.toFixed(2);
document.getElementById('leanBodyMassResult').textContent = calculatedLeanBodyMass.toFixed(2);
document.getElementById('fatMassResult').textContent = calculatedFatMass.toFixed(2);
// Update table
var tableWaterWeightKg = calculatedWaterWeight;
var tableWaterWeightLbs = calculatedWaterWeight * 2.20462; // Conversion factor
var tableLeanBodyMassKg = calculatedLeanBodyMass;
var tableLeanBodyMassLbs = calculatedLeanBodyMass * 2.20462;
var tableFatMassKg = calculatedFatMass;
var tableFatMassLbs = calculatedFatMass * 2.20462;
var tableTotalWeightKg = bodyWeight;
var tableTotalWeightLbs = bodyWeight * 2.20462;
// Percentage calculations for table
var waterPercentageOutput = (calculatedWaterWeight / bodyWeight) * 100;
var leanBodyMassPercentageOutput = (calculatedLeanBodyMass / bodyWeight) * 100;
var fatMassPercentageOutput = (calculatedFatMass / bodyWeight) * 100;
document.getElementById('tableWaterWeightKg').textContent = tableWaterWeightKg.toFixed(2);
document.getElementById('tableWaterWeightLbs').textContent = tableWaterWeightLbs.toFixed(2);
document.getElementById('tableWaterPercentage').textContent = waterPercentageOutput.toFixed(1) + '%';
document.getElementById('tableLeanBodyMassKg').textContent = tableLeanBodyMassKg.toFixed(2);
document.getElementById('tableLeanBodyMassLbs').textContent = tableLeanBodyMassLbs.toFixed(2);
document.getElementById('tableLeanBodyMassPercentage').textContent = leanBodyMassPercentageOutput.toFixed(1) + '%';
document.getElementById('tableFatMassKg').textContent = tableFatMassKg.toFixed(2);
document.getElementById('tableFatMassLbs').textContent = tableFatMassLbs.toFixed(2);
document.getElementById('tableFatPercentage').textContent = fatMassPercentageOutput.toFixed(1) + '%';
document.getElementById('tableTotalWeightKg').textContent = tableTotalWeightKg.toFixed(2);
document.getElementById('tableTotalWeightLbs').textContent = tableTotalWeightLbs.toFixed(2);
// Update Chart Data
chartData = [
calculatedWaterWeight,
calculatedLeanBodyMass,
calculatedFatMass
];
updateChart();
}
function resetCalculator() {
document.getElementById('bodyWeight').value = '70';
document.getElementById('waterPercentage').value = '60';
// Clear errors
document.getElementById('bodyWeightError').textContent = ";
document.getElementById('waterPercentageError').textContent = ";
// Reset results to default state
document.getElementById('mainResult').textContent = '–';
document.getElementById('waterWeightResult').textContent = '–';
document.getElementById('leanBodyMassResult').textContent = '–';
document.getElementById('fatMassResult').textContent = '–';
// Reset table
document.getElementById('tableWaterWeightKg').textContent = '–';
document.getElementById('tableWaterWeightLbs').textContent = '–';
document.getElementById('tableWaterPercentage').textContent = '–';
document.getElementById('tableLeanBodyMassKg').textContent = '–';
document.getElementById('tableLeanBodyMassLbs').textContent = '–';
document.getElementById('tableLeanBodyMassPercentage').textContent = '–';
document.getElementById('tableFatMassKg').textContent = '–';
document.getElementById('tableFatMassLbs').textContent = '–';
document.getElementById('tableFatPercentage').textContent = '–';
document.getElementById('tableTotalWeightKg').textContent = '–';
document.getElementById('tableTotalWeightLbs').textContent = '–';
// Reset chart data and redraw
chartData = [0, 0, 0];
updateChart();
}
function copyResults() {
var mainResult = document.getElementById('mainResult').textContent;
var waterWeightResult = document.getElementById('waterWeightResult').textContent;
var leanBodyMassResult = document.getElementById('leanBodyMassResult').textContent;
var fatMassResult = document.getElementById('fatMassResult').textContent;
var assumptions = "Key Assumptions:\n";
assumptions += "- Estimated Water Percentage: " + document.getElementById('waterPercentage').value + "%\n";
assumptions += "- Assumed Body Fat Percentage (for LBM/Fat Mass estimate): 25%\n"; // Reflects the hardcoded assumption
var resultsText = "Water Weight Calculator Results:\n\n";
resultsText += "Main Result (Water Weight): " + mainResult + "\n";
resultsText += "Water Weight: " + waterWeightResult + "\n";
resultsText += "Lean Body Mass: " + leanBodyMassResult + "\n";
resultsText += "Fat Mass: " + fatMassResult + "\n\n";
resultsText += assumptions;
// Use a temporary textarea to copy to clipboard
var textArea = document.createElement("textarea");
textArea.value = resultsText;
textArea.style.position = "fixed";
textArea.style.left = "-9999px";
document.body.appendChild(textArea);
textArea.focus();
textArea.select();
try {
document.execCommand('copy');
alert('Results copied to clipboard!');
} catch (e) {
alert('Failed to copy results. Please copy manually.');
}
document.body.removeChild(textArea);
}
function updateChart() {
var ctx = document.getElementById('compositionChart').getContext('2d');
// Destroy previous chart instance if it exists
if (compositionChartInstance) {
compositionChartInstance.destroy();
}
compositionChartInstance = new Chart(ctx, {
type: 'pie', // Changed to pie for composition breakdown
data: {
labels: chartLabels,
datasets: [{
label: 'Composition',
data: chartData,
backgroundColor: chartColors,
borderColor: '#fff', // White border for separation
borderWidth: 2
}]
},
options: {
responsive: true,
maintainAspectRatio: false, // Allow custom height
plugins: {
legend: {
position: 'bottom',
},
title: {
display: true,
text: 'Body Composition Distribution',
font: {
size: 16
}
}
}
}
});
}
// Initialize chart on page load
document.addEventListener('DOMContentLoaded', function() {
resetCalculator(); // Initialize with default values
updateChart(); // Initial chart render
// Attach event listeners for real-time updates
document.getElementById('bodyWeight').addEventListener('input', calculateWaterWeight);
document.getElementById('waterPercentage').addEventListener('input', calculateWaterWeight);
});
// Function to toggle FAQ answers
document.addEventListener('click', function(e) {
if (e.target && e.target.tagName === 'STRONG' && e.target.closest('.faq-item')) {
var faqItem = e.target.closest('.faq-item');
var p = faqItem.querySelector('p');
if (p.style.display === 'block') {
p.style.display = 'none';
} else {
p.style.display = 'block';
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