Track your journey, analyze your progress, and achieve your fitness goals.
Enter Your Data
Your weight at the beginning of the tracking period.
Your current weight.
The duration in weeks over which the weight change occurred.
Weight Loss
Weight Gain
Maintain Weight
Your primary fitness objective.
Your Weight Progression Summary
Total Weight Change:—
Average Weekly Change:—
Change Direction:—
Progress Rate Relative to Goal:—
Formula Explanation:
Total Weight Change = Current Weight – Starting Weight.
Average Weekly Change = Total Weight Change / Time Period (in weeks).
Change Direction indicates if you are losing, gaining, or maintaining weight.
Progress Rate Relative to Goal compares your average weekly change to a healthy target rate (e.g., 1-2 lbs for loss/gain) based on your goal.
Weight Progression Over Time
Weight Loss Weight Gain Target Rate
The chart visualizes your total weight change against the time period, showing if you are on track for your goal.
Weight Progression Details
Week
Weight
Change Since Last Week
Cumulative Change
Status
Enter data and calculate to see details.
This table breaks down your weight progression week by week.
{primary_keyword}
Welcome to our comprehensive guide to the **weight progression calculator**. In the dynamic world of fitness and health, understanding and tracking your body's changes is paramount. Whether your goal is to shed pounds, build muscle, or simply maintain a healthy physique, monitoring your weight progression is a cornerstone of success. This tool is designed to provide clarity, insight, and motivation by analyzing your weight changes over a specified period. Let's dive deep into what this calculator is, how it works, and how you can leverage it to optimize your fitness journey.
What is a Weight Progression Calculator?
A **weight progression calculator** is a specialized tool that helps individuals monitor and analyze their weight changes over time. It takes into account your starting weight, current weight, and the duration between these measurements to calculate key metrics such as total weight change, average weekly change, and progress rate relative to a specific fitness goal (weight loss, weight gain, or maintenance). This **weight progression calculator** transforms raw data into actionable insights, empowering you to make informed decisions about your diet, exercise, and overall lifestyle.
Who should use it?
Individuals aiming for significant weight loss or gain.
Athletes and bodybuilders tracking muscle gain or fat loss.
Anyone seeking to maintain a stable, healthy weight.
People recovering from illness or undergoing medical treatments that affect weight.
Fitness enthusiasts who want to quantify their progress and stay motivated.
Common Misconceptions:
"The scale is the only measure of progress." While important, the **weight progression calculator** highlights that other factors like body composition, energy levels, and strength gains also contribute to overall fitness.
"Rapid weight change is always good." This calculator helps differentiate between healthy and unhealthy rates of change, a crucial aspect of sustainable fitness.
"It's just about losing or gaining." The calculator also supports weight maintenance, a vital goal for long-term health and stability.
{primary_keyword} Formula and Mathematical Explanation
The core of the **weight progression calculator** lies in straightforward yet powerful mathematical formulas. These formulas dissect your weight journey into understandable components.
Core Calculations
Total Weight Change: This is the fundamental metric that shows the absolute difference between your starting and current weight. It's calculated as:
Total Weight Change = Current Weight - Starting Weight
Average Weekly Change: This metric contextualizes your total weight change over the period. It indicates the average rate at which your weight has changed per week.
Average Weekly Change = Total Weight Change / Time Period (in weeks)
Change Direction: This is a qualitative assessment based on the sign of the Total Weight Change.
If Current Weight > Starting Weight, the direction is Weight Gain.
If Current Weight < Starting Weight, the direction is Weight Loss.
If Current Weight = Starting Weight, the direction is Weight Maintenance.
Progress Rate Relative to Goal: This is a more advanced metric that compares your Average Weekly Change to recommended healthy rates. For weight loss or gain, a common healthy range is 1 to 2 pounds (approximately 0.5 to 1 kg) per week. For maintenance, the ideal rate is 0. For this calculator, we compare the absolute value of the average weekly change against a target rate (e.g., 1.5 lbs).
Progress Rate = |Average Weekly Change|
The interpretation would be: On track, too fast, too slow, or on target for maintenance.
Variable Explanation Table
Variable
Meaning
Unit
Typical Range / Interpretation
Starting Weight
Your weight at the beginning of the tracking period.
Weight Unit (e.g., kg, lbs)
Positive numerical value
Current Weight
Your weight at the end of the tracking period.
Weight Unit (e.g., kg, lbs)
Positive numerical value
Time Period
The duration between the starting and current weight measurements.
Weeks
Positive numerical value (e.g., 4, 12, 52)
Total Weight Change
The net change in weight over the time period.
Weight Unit (e.g., kg, lbs)
Can be positive (gain), negative (loss), or zero (maintain).
Average Weekly Change
The average rate of weight change per week.
Weight Unit per Week (e.g., kg/week, lbs/week)
Varies; e.g., +/- 1 to 2 lbs/week for healthy loss/gain.
Change Direction
Indicates whether weight was lost, gained, or maintained.
Categorical
Weight Loss, Weight Gain, Maintain Weight.
Progress Rate Relative to Goal
Compares achieved weekly change to a healthy target rate.
Categorical / Percentage
On Track, Too Fast, Too Slow, On Target (for maintenance).
Practical Examples (Real-World Use Cases)
To illustrate the utility of the **weight progression calculator**, let's consider a couple of scenarios:
Example 1: Weight Loss Journey
Scenario: Sarah wants to lose weight. She starts at 70 kg and after 12 weeks of a new diet and exercise plan, she weighs 66 kg.
Inputs:
Starting Weight: 70 kg
Current Weight: 66 kg
Time Period: 12 weeks
Goal: Weight Loss
Calculations:
Total Weight Change = 66 kg – 70 kg = -4 kg
Average Weekly Change = -4 kg / 12 weeks = -0.33 kg/week (approximately)
Change Direction: Weight Loss
Progress Rate Relative to Goal: Sarah is losing 0.33 kg per week. A healthy target for weight loss is often considered around 0.5-1 kg per week. So, she is losing weight, but perhaps a bit slower than ideal for rapid results, suggesting she might need to review her plan's intensity or adherence.
Interpretation: Sarah has successfully lost weight, but the rate is on the slower side. She might consider if her calorie deficit is sufficient or if her activity levels could be increased slightly to achieve a more optimal rate of ~0.5 kg per week.
Example 2: Muscle Gain Program
Scenario: Mark is focused on building muscle. He started at 80 kg and after 8 weeks of a strength training program, he weighs 83 kg.
Inputs:
Starting Weight: 80 kg
Current Weight: 83 kg
Time Period: 8 weeks
Goal: Weight Gain (Muscle)
Calculations:
Total Weight Change = 83 kg – 80 kg = +3 kg
Average Weekly Change = +3 kg / 8 weeks = +0.375 kg/week
Change Direction: Weight Gain
Progress Rate Relative to Goal: Mark is gaining 0.375 kg per week. For muscle gain, this is a very healthy and sustainable rate, suggesting his training and nutrition are well-aligned. A common target for lean mass gain is around 0.25-0.5 kg per week.
Interpretation: Mark is making excellent progress towards his muscle gain goal. The steady, moderate rate of weight increase indicates he is likely gaining muscle mass rather than excessive fat, which is ideal for a lean bulk. This positive outcome from the **weight progression calculator** confirms the effectiveness of his current program.
How to Use This Weight Progression Calculator
Using our **weight progression calculator** is simple and intuitive. Follow these steps:
Enter Starting Weight: Input your weight from the beginning of your fitness tracking period. Ensure you use consistent units (e.g., kilograms or pounds).
Enter Current Weight: Input your most recent weight measurement. Again, maintain consistent units.
Specify Time Period: Enter the number of weeks that have passed between your starting weight and current weight measurements.
Select Your Goal: Choose whether your objective is Weight Loss, Weight Gain, or to Maintain Weight. This helps contextualize the results.
Calculate: Click the "Calculate Progression" button. The calculator will instantly display your key metrics.
How to read results:
Total Weight Change: A negative number indicates weight loss; a positive number indicates weight gain; zero means maintenance.
Average Weekly Change: This tells you the average pace of your progress per week. Compare this to healthy benchmarks (e.g., ~0.5-1 kg/week for loss/gain).
Change Direction: Clearly states whether you are losing, gaining, or maintaining weight.
Progress Rate Relative to Goal: Assesses if your current rate aligns with healthy and sustainable progress for your stated goal.
Decision-making guidance:
If losing weight too slowly: Consider increasing your calorie deficit or physical activity slightly.
If losing weight too quickly: Ensure you're not sacrificing muscle mass or essential nutrients. Slow down the rate if it's unsustainable or causing fatigue.
If gaining weight too slowly: Check if your calorie surplus is sufficient and your training intensity is appropriate for muscle growth.
If gaining weight too quickly: You might be accumulating excess body fat. Adjust your calorie surplus or macronutrient intake.
For maintenance: Ensure your average weekly change is close to zero. Minor fluctuations are normal.
Utilize the generated chart and table to visualize trends and identify specific points of significant change. This detailed analysis from the **weight progression calculator** aids in fine-tuning your approach.
Key Factors That Affect Weight Progression Results
While the **weight progression calculator** provides a quantitative overview, numerous factors influence your actual weight changes. Understanding these can help you interpret the results more accurately and make necessary adjustments:
Caloric Intake vs. Expenditure: The fundamental principle of weight change. A consistent calorie deficit leads to weight loss, a surplus to gain, and balance to maintenance. Fluctuations in diet or activity directly impact the calculator's output.
Metabolism: Individual metabolic rates vary significantly. Factors like age, sex, muscle mass, and genetics influence how efficiently your body burns calories, affecting the rate of weight change. A higher metabolic rate can accelerate results.
Muscle Mass: Muscle is denser than fat and metabolically active. Increasing muscle mass can lead to weight gain even as body fat decreases, impacting the interpretation of the **weight progression calculator**'s total change. Strength training is key here.
Water Retention: Body weight can fluctuate significantly due to water balance, influenced by sodium intake, hydration levels, hormonal changes (especially in women), and carbohydrate consumption. These fluctuations can temporarily obscure underlying fat loss or muscle gain trends.
Hormonal Balance: Hormones like cortisol, insulin, thyroid hormones, and sex hormones play a critical role in weight regulation, appetite, and body composition. Imbalances can hinder or accelerate weight change, regardless of diet and exercise.
Sleep Quality and Stress Levels: Poor sleep and high stress can disrupt hormones (like cortisol and ghrelin), leading to increased appetite, cravings for unhealthy foods, and impaired fat metabolism. This can slow down weight loss or promote fat gain, affecting the results shown by the **weight progression calculator**.
Consistency and Adherence: The calculator assumes consistent effort over the stated period. Sporadic adherence to diet and exercise plans will lead to inconsistent results that may not reflect the true potential of a well-structured program.
Digestive Health: The efficiency of nutrient absorption and waste elimination can impact weight. Conditions affecting the gut microbiome or digestive processes can influence weight management.
Frequently Asked Questions (FAQ)
Q1: What is the ideal weekly weight loss rate?
A: For sustainable and healthy weight loss, a rate of 1-2 pounds (approximately 0.5-1 kg) per week is generally recommended. Our **weight progression calculator** helps you assess if you are within this range.
Q2: Is gaining weight always bad?
A: Not necessarily. If your goal is to build muscle or increase overall mass, gaining weight at a controlled pace is desirable. The **weight progression calculator** helps differentiate between healthy gain and excessive fat accumulation.
Q3: How often should I use the weight progression calculator?
A: It depends on your goals and the rate of change. For significant weight loss or gain, weekly or bi-weekly updates are useful. For maintenance or slower progress, monthly checks might suffice. Consistency is key.
Q4: What if my weight fluctuates daily?
A: Daily fluctuations are normal due to water, food intake, and other factors. It's best to take measurements under consistent conditions (e.g., first thing in the morning after using the restroom) and focus on the trend over weeks, as highlighted by the **weight progression calculator**'s average weekly change.
Q5: Does the calculator account for body composition changes?
A: The standard **weight progression calculator** primarily uses scale weight. It doesn't directly measure body fat or muscle mass. While weight change is an indicator, consider using body composition analysis (e.g., body fat percentage) alongside the calculator for a more complete picture.
Q6: Can I use different units (kg vs. lbs)?
A: This specific calculator assumes consistent units are entered. Ensure you use either kilograms (kg) or pounds (lbs) for both starting and current weights. The calculations will be performed based on the units provided.
Q7: What if my goal is performance-based, not just weight?
A: While weight is a factor, performance goals (strength, endurance, speed) are also crucial. Use the **weight progression calculator** to track weight changes that support your performance goals, but also monitor performance metrics directly.
Q8: How does the "Progress Rate Relative to Goal" work?
A: It compares your actual average weekly change against a generally accepted healthy rate for your goal (e.g., 0.5-1 kg/week for loss/gain). If your rate is significantly higher or lower than this benchmark, it suggests your plan might be too aggressive, too lenient, or perfectly optimized.
var chart = null; // Declare chart globally
function validateInput(id, errorId, minValue, maxValue) {
var input = document.getElementById(id);
var errorElement = document.getElementById(errorId);
var value = parseFloat(input.value);
var isValid = true;
errorElement.textContent = "; // Clear previous error
if (isNaN(value)) {
errorElement.textContent = 'Please enter a valid number.';
isValid = false;
} else if (minValue !== undefined && value maxValue) {
errorElement.textContent = 'Value out of range.';
isValid = false;
}
input.style.borderColor = isValid ? '#ccc' : '#dc3545';
return isValid;
}
function calculateWeightProgression() {
var initialWeight = parseFloat(document.getElementById('initialWeight').value);
var finalWeight = parseFloat(document.getElementById('finalWeight').value);
var timePeriod = parseFloat(document.getElementById('timePeriod').value);
var goal = document.getElementById('goal').value;
var initialWeightError = document.getElementById('initialWeightError');
var finalWeightError = document.getElementById('finalWeightError');
var timePeriodError = document.getElementById('timePeriodError');
var goalError = document.getElementById('goalError'); // Not strictly needed for select, but good practice
var allValid = true;
if (isNaN(initialWeight) || initialWeight <= 0) { allValid = false; initialWeightError.textContent = 'Enter a valid starting weight.'; }
if (isNaN(finalWeight) || finalWeight <= 0) { allValid = false; finalWeightError.textContent = 'Enter a valid current weight.'; }
if (isNaN(timePeriod) || timePeriod <= 0) { allValid = false; timePeriodError.textContent = 'Enter a valid time period (weeks).'; }
if (!allValid) {
return; // Stop calculation if any input is invalid
}
var totalWeightChange = finalWeight – initialWeight;
var averageWeeklyChange = totalWeightChange / timePeriod;
var changeDirection = "";
var progressRateVsGoal = "";
// Determine Change Direction
if (totalWeightChange 0) {
changeDirection = "Weight Gain";
} else {
changeDirection = "Weight Maintenance";
}
// Determine Progress Rate Relative to Goal
var absAverageWeeklyChange = Math.abs(averageWeeklyChange);
var targetRateLossGain = 1.5; // lbs/week as a common target for healthy loss/gain
var targetRateMaintain = 0.1; // Allow small buffer for maintenance
if (goal === "loss") {
if (absAverageWeeklyChange === 0) {
progressRateVsGoal = "No Change (Goal: Loss)";
} else if (absAverageWeeklyChange targetRateLossGain * 1.3) { // More than 130% of target
progressRateVsGoal = "Too Fast (Rate: " + absAverageWeeklyChange.toFixed(2) + ")";
} else {
progressRateVsGoal = "On Track (Rate: " + absAverageWeeklyChange.toFixed(2) + ")";
}
} else if (goal === "gain") {
if (absAverageWeeklyChange === 0) {
progressRateVsGoal = "No Change (Goal: Gain)";
} else if (absAverageWeeklyChange targetRateLossGain * 1.3) { // More than 130% of target
progressRateVsGoal = "Too Fast (Rate: " + absAverageWeeklyChange.toFixed(2) + ")";
} else {
progressRateVsGoal = "On Track (Rate: " + absAverageWeeklyChange.toFixed(2) + ")";
}
} else { // Maintain
if (absAverageWeeklyChange targetRateMaintain * 2) { // Significantly off target
progressRateVsGoal = "Significant Fluctuation (Rate: " + averageWeeklyChange.toFixed(2) + ")";
} else {
progressRateVsGoal = "Slight Fluctuation (Rate: " + averageWeeklyChange.toFixed(2) + ")";
}
}
document.getElementById('totalWeightChange').textContent = totalWeightChange.toFixed(2);
document.getElementById('averageWeeklyChange').textContent = averageWeeklyChange.toFixed(2);
document.getElementById('changeDirection').textContent = changeDirection;
document.getElementById('progressRateVsGoal').textContent = progressRateVsGoal;
// Update Table
updateProgressionTable(initialWeight, finalWeight, timePeriod, totalWeightChange, averageWeeklyChange, changeDirection);
// Update Chart
updateWeightChart(initialWeight, finalWeight, timePeriod);
}
function updateProgressionTable(startWeight, endWeight, weeks, totalChange, avgWeeklyChange, direction) {
var tableBody = document.getElementById('progressionTableBody');
tableBody.innerHTML = "; // Clear previous rows
var currentWeight = startWeight;
var weightUnit = 'kg'; // Assuming kg for display, could be made dynamic
for (var i = 0; i 0) {
var changeThisWeek = avgWeeklyChange; // Use average for simplicity in table display
cellChange.textContent = changeThisWeek.toFixed(2) + ' ' + weightUnit;
cellCumulative.textContent = (startWeight + changeThisWeek * i).toFixed(2) + ' ' + weightUnit;
var weekStatus = "";
var calculatedWeight = startWeight + changeThisWeek * i;
if (direction === "Weight Loss") {
weekStatus = (calculatedWeight startWeight) ? "Gaining" : "Stable";
} else {
weekStatus = "Maintaining";
}
cellStatus.textContent = weekStatus;
} else {
cellChange.textContent = '-';
cellCumulative.textContent = startWeight.toFixed(2) + ' ' + weightUnit;
cellStatus.textContent = 'Start';
}
// Update currentWeight for the next iteration IF we were to simulate step-by-step change
// For simplicity, this table uses the average weekly change to calculate each row's value.
// A more complex simulation would adjust currentWeight per row.
currentWeight = startWeight + avgWeeklyChange * i; // This line ensures consistency if used for detailed simulation
}
}
function updateWeightChart(initialWeight, finalWeight, timePeriod) {
var canvas = document.getElementById('weightChartCanvas');
var ctx = canvas.getContext('2d');
// Destroy previous chart instance if it exists
if (chart) {
chart.destroy();
}
var dataPoints = [];
var targetDataPoints = []; // For visualizing goal rate
var avgWeeklyChange = (finalWeight – initialWeight) / timePeriod;
var weightUnit = 'kg'; // Assuming kg for display
// Generate data points for the actual weight progression
for (var i = 0; i <= timePeriod; i++) {
var weight = initialWeight + avgWeeklyChange * i;
dataPoints.push({ x: i, y: weight });
// Generate target data points for maintenance (0 change)
targetDataPoints.push({ x: i, y: initialWeight });
}
// Prepare data for Chart.js (or native drawing if not using a library)
// For this example, we'll simulate drawing with native canvas context
// In a real scenario, you'd likely use a library like Chart.js for ease.
// Since pure SVG/Canvas is required: Let's use native Canvas API.
// Clear previous drawing
ctx.clearRect(0, 0, canvas.width, canvas.height);
var chartWidth = canvas.width;
var chartHeight = canvas.height;
var padding = 50; // Padding around the chart area
// Find min/max values for scaling
var minY = Math.min(initialWeight, finalWeight) – 5;
var maxY = Math.max(initialWeight, finalWeight) + 5;
if (minY < 0) minY = 0; // Weight can't be negative
// Adjust maxY to accommodate target line if it's significantly different
if (Math.abs(initialWeight – finalWeight) 10) { // If change is small, ensure target line is visible
maxY = Math.max(maxY, initialWeight + 5);
minY = Math.min(minY, initialWeight – 5);
if (minY < 0) minY = 0;
} else {
// Ensure target line (initial weight) is visible within the range
minY = Math.min(minY, initialWeight);
maxY = Math.max(maxY, initialWeight);
}
var scaleY = (chartHeight – 2 * padding) / (maxY – minY);
var scaleX = (chartWidth – 2 * padding) / timePeriod;
// Draw Axes
ctx.strokeStyle = '#ccc';
ctx.lineWidth = 1;
ctx.beginPath();
// Y-axis
ctx.moveTo(padding, padding);
ctx.lineTo(padding, chartHeight – padding);
ctx.stroke();
// X-axis
ctx.moveTo(padding, chartHeight – padding);
ctx.lineTo(chartWidth – padding, chartHeight – padding);
ctx.stroke();
// Draw Labels for Axes
ctx.fillStyle = '#333';
ctx.font = '12px Arial';
ctx.textAlign = 'right';
ctx.fillText(maxY.toFixed(1), padding – 10, padding);
ctx.textAlign = 'center';
ctx.fillText(minY.toFixed(1), padding – 10, chartHeight – padding);
ctx.fillText('0', padding – 10, chartHeight – padding); // Origin label
ctx.textAlign = 'center';
ctx.fillText('Start (Week 0)', padding, chartHeight – padding + 20);
ctx.fillText('End (Week ' + timePeriod + ')', chartWidth – padding, chartHeight – padding + 20);
ctx.fillText('Time (Weeks)', chartWidth / 2, chartHeight – padding + 40);
ctx.save();
ctx.translate(padding – 30, chartHeight / 2);
ctx.rotate(-Math.PI / 2);
ctx.fillText('Weight (' + weightUnit + ')', 0, 0);
ctx.restore();
// Draw Target Line (Maintenance)
ctx.beginPath();
ctx.setLineDash([5, 5]); // Dashed line
ctx.strokeStyle = '#ffc107'; // Yellow for maintenance target
ctx.lineWidth = 2;
var startYTarget = chartHeight – padding – (initialWeight – minY) * scaleY;
var endYTarget = chartHeight – padding – (initialWeight – minY) * scaleY; // Stays constant for maintenance
ctx.moveTo(padding, startYTarget);
ctx.lineTo(chartWidth – padding, endYTarget);
ctx.stroke();
ctx.setLineDash([]); // Reset line dash
// Draw Actual Weight Progression Line
ctx.beginPath();
ctx.setLineDash([]); // Solid line
ctx.strokeStyle = avgWeeklyChange 0 ? '#28a745' : '#004a99'); // Red for loss, Green for gain, Blue for maintain
ctx.lineWidth = 3;
for (var i = 0; i < dataPoints.length; i++) {
var x = padding + dataPoints[i].x * scaleX;
var y = chartHeight – padding – (dataPoints[i].y – minY) * scaleY;
if (i === 0) {
ctx.moveTo(x, y);
} else {
ctx.lineTo(x, y);
}
}
ctx.stroke();
// Draw data points
ctx.fillStyle = avgWeeklyChange 0 ? '#28a745' : '#004a99');
for (var i = 0; i < dataPoints.length; i++) {
var x = padding + dataPoints[i].x * scaleX;
var y = chartHeight – padding – (dataPoints[i].y – minY) * scaleY;
ctx.beginPath();
ctx.arc(x, y, 5, 0, Math.PI * 2); // radius 5
ctx.fill();
}
}
function copyResults() {
var mainResult = document.getElementById('averageWeeklyChange').textContent;
var totalChange = document.getElementById('totalWeightChange').textContent;
var changeDirection = document.getElementById('changeDirection').textContent;
var progressRate = document.getElementById('progressRateVsGoal').textContent;
var assumptions = [];
assumptions.push("Starting Weight: " + document.getElementById('initialWeight').value + " kg");
assumptions.push("Current Weight: " + document.getElementById('finalWeight').value + " kg");
assumptions.push("Time Period: " + document.getElementById('timePeriod').value + " weeks");
assumptions.push("Goal: " + document.getElementById('goal').options[document.getElementById('goal').selectedIndex].text);
var textToCopy = "Weight Progression Results:\n";
textToCopy += "—————————\n";
textToCopy += "Average Weekly Change: " + mainResult + "\n";
textToCopy += "Total Weight Change: " + totalChange + "\n";
textToCopy += "Change Direction: " + changeDirection + "\n";
textToCopy += "Progress Rate vs. Goal: " + progressRate + "\n\n";
textToCopy += "Key Assumptions:\n";
textToCopy += assumptions.join("\n");
// Use navigator.clipboard for modern browsers
if (navigator.clipboard && navigator.clipboard.writeText) {
navigator.clipboard.writeText(textToCopy).then(function() {
alert('Results copied to clipboard!');
}).catch(function(err) {
console.error('Failed to copy: ', err);
fallbackCopyTextToClipboard(textToCopy); // Fallback for older browsers
});
} else {
fallbackCopyTextToClipboard(textToCopy); // Fallback
}
}
function fallbackCopyTextToClipboard(text) {
var textArea = document.createElement("textarea");
textArea.value = text;
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 ? 'successful' : 'unsuccessful';
alert('Results copied to clipboard! (' + msg + ')');
} catch (err) {
console.error('Fallback: Oops, unable to copy', err);
alert('Failed to copy results.');
}
document.body.removeChild(textArea);
}
function resetCalculator() {
document.getElementById('initialWeight').value = '';
document.getElementById('finalWeight').value = '';
document.getElementById('timePeriod').value = '';
document.getElementById('goal').value = 'loss';
document.getElementById('initialWeightError').textContent = '';
document.getElementById('finalWeightError').textContent = '';
document.getElementById('timePeriodError').textContent = '';
document.getElementById('initialWeight').style.borderColor = '#ccc';
document.getElementById('finalWeight').style.borderColor = '#ccc';
document.getElementById('timePeriod').style.borderColor = '#ccc';
document.getElementById('totalWeightChange').textContent = '–';
document.getElementById('averageWeeklyChange').textContent = '–';
document.getElementById('changeDirection').textContent = '–';
document.getElementById('progressRateVsGoal').textContent = '–';
var tableBody = document.getElementById('progressionTableBody');
tableBody.innerHTML = '
Enter data and calculate to see details.
';
var canvas = document.getElementById('weightChartCanvas');
var ctx = canvas.getContext('2d');
ctx.clearRect(0, 0, canvas.width, canvas.height);
if (chart) {
chart.destroy(); // Destroy previous chart instance
chart = null;
}
}
// Initial setup for chart dimensions
function setupCanvas() {
var canvas = document.getElementById('weightChartCanvas');
// Set dimensions dynamically or based on container size
canvas.width = document.getElementById('chart-container').offsetWidth * 0.9; // Responsive width
canvas.height = 300; // Fixed height or make responsive too
}
// Call setupCanvas on load and resize
window.addEventListener('load', setupCanvas);
window.addEventListener('resize', setupCanvas);
// Initial calculation on load if there are default values (optional)
// calculateWeightProgression();