Weight Loss Inches Calculator: Track Your Progress
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Your Inch Loss Tracker
Your Inch Loss Summary
Total Inches Lost: 0.00
Formula: Total Inches Lost = (Initial Waist + Initial Hips + 2*Initial Thigh + 2*Initial Arm + Initial Chest) – (Current Waist + Current Hips + 2*Current Thigh + 2*Current Arm + Current Chest)
Inch Loss Progress Over Time
Visualizing your journey helps in staying motivated.
Measurement Details
| Measurement Area |
Initial (in) |
Current (in) |
Lost (in) |
| Waist |
0.00 |
0.00 |
0.00 |
| Hips |
0.00 |
0.00 |
0.00 |
| Thigh (Total) |
0.00 |
0.00 |
0.00 |
| Arm (Total) |
0.00 |
0.00 |
0.00 |
| Chest |
0.00 |
0.00 |
0.00 |
What is the Weight Loss Inches Calculator?
The Weight Loss Inches Calculator is a specialized tool designed to help individuals track their progress beyond just the number on the scale. It allows users to input initial and current measurements for various body parts (like waist, hips, thighs, arms, and chest) and calculates the total inches lost. This focus on circumference changes is crucial because it can indicate fat loss even when weight remains stable due to muscle gain, water retention, or hormonal fluctuations. It provides a more nuanced and often more encouraging perspective on a weight loss journey, highlighting changes in body composition.
Who Should Use It?
Anyone engaged in a weight loss or body recomposition program can benefit from this weight loss inches calculator. This includes:
- Individuals trying to lose body fat and reshape their physique.
- People who are exercising and building muscle, and want to see fat reduction despite potential weight plateaus.
- Those who feel their clothes are fitting looser but the scale isn't moving significantly.
- Anyone looking for a more comprehensive way to monitor their health and fitness progress.
- Users interested in tracking specific areas of the body for toning or fat reduction.
Common Misconceptions
A frequent misconception is that this weight loss inches calculator solely measures fat loss. While it's a strong indicator, it doesn't differentiate between fat loss, muscle gain, or changes in water retention. Another thought is that losing inches automatically means losing weight, which isn't always true, especially for individuals incorporating strength training. It's best used in conjunction with other progress metrics.
Weight Loss Inches Calculator Formula and Mathematical Explanation
The core of the weight loss inches calculator lies in comparing initial measurements to current measurements across key body areas. The formula quantifies the total reduction in circumference.
Step-by-Step Derivation
- Sum Initial Measurements: Add up the initial measurements for all tracked body parts. Remember to account for bilateral measurements (like thighs and arms) by doubling their individual value.
- Sum Current Measurements: Add up the current measurements for all tracked body parts, again doubling bilateral measurements.
- Calculate Total Inches Lost: Subtract the total current measurements from the total initial measurements.
The formula can be represented as:
Total Inches Lost = (Initial Waist + Initial Hips + 2 * Initial Thigh + 2 * Initial Arm + Initial Chest) – (Current Waist + Current Hips + 2 * Current Thigh + 2 * Current Arm + Current Chest)
Variable Explanations
Let's break down the variables used in the calculation:
| Variable |
Meaning |
Unit |
Typical Range |
| Initial Waist |
Starting measurement around the narrowest part of the torso. |
Inches |
20 – 60+ |
| Current Waist |
Current measurement around the narrowest part of the torso. |
Inches |
18 – 58+ |
| Initial Hips |
Starting measurement around the fullest part of the hips and buttocks. |
Inches |
30 – 70+ |
| Current Hips |
Current measurement around the fullest part of the hips and buttocks. |
Inches |
28 – 68+ |
| Initial Thigh |
Starting measurement around the fullest part of one thigh. |
Inches |
15 – 30+ |
| Current Thigh |
Current measurement around the fullest part of one thigh. |
Inches |
14 – 28+ |
| Initial Arm |
Starting measurement around the fullest part of one upper arm. |
Inches |
8 – 20+ |
| Current Arm |
Current measurement around the fullest part of one upper arm. |
Inches |
7 – 18+ |
| Initial Chest |
Starting measurement around the fullest part of the chest. |
Inches |
30 – 60+ |
| Current Chest |
Current measurement around the fullest part of the chest. |
Inches |
28 – 58+ |
| Total Initial Inches |
Sum of all starting measurements (including doubled bilateral ones). |
Inches |
Calculated |
| Total Current Inches |
Sum of all current measurements (including doubled bilateral ones). |
Inches |
Calculated |
| Total Inches Lost |
The primary output: difference between total initial and total current inches. |
Inches |
0+ |
Practical Examples (Real-World Use Cases)
Example 1: Focusing on Fat Loss
Sarah wants to lose body fat and improve her physique. She starts a new fitness routine and healthy eating plan. After 8 weeks, she uses the weight loss inches calculator to see her progress.
Sarah's Initial Measurements:
- Waist: 34 inches
- Hips: 44 inches
- Thigh (each): 25 inches
- Arm (each): 13 inches
- Chest: 41 inches
Sarah's Current Measurements (after 8 weeks):
- Waist: 31 inches
- Hips: 42 inches
- Thigh (each): 23.5 inches
- Arm (each): 12 inches
- Chest: 40 inches
Calculation:
- Total Initial Inches = 34 + 44 + 2*(25) + 2*(13) + 41 = 34 + 44 + 50 + 26 + 41 = 195 inches
- Total Current Inches = 31 + 42 + 2*(23.5) + 2*(12) + 40 = 31 + 42 + 47 + 24 + 40 = 184 inches
- Total Inches Lost = 195 – 184 = 11 inches
Interpretation:
Sarah has lost a total of 11 inches across her body measurements. This is a significant achievement and a great indicator of fat loss, especially in areas like her waist and hips. She can use this information to stay motivated. Her journey demonstrates the power of consistent effort. She might also want to explore resources on [healthy eating for fat loss](link-to-healthy-eating-guide).
Example 2: Muscle Gain vs. Fat Loss
Mark has been strength training consistently and also aims to lose some stubborn belly fat. He's concerned the scale isn't moving much because he's gaining muscle.
Mark's Initial Measurements:
- Waist: 36 inches
- Hips: 42 inches
- Thigh (each): 24 inches
- Arm (each): 12 inches
- Chest: 40 inches
Mark's Current Measurements (after 6 weeks):
- Waist: 34 inches
- Hips: 41.5 inches
- Thigh (each): 24.5 inches (gained muscle)
- Arm (each): 12.5 inches (gained muscle)
- Chest: 41 inches (gained muscle)
Calculation:
- Total Initial Inches = 36 + 42 + 2*(24) + 2*(12) + 40 = 36 + 42 + 48 + 24 + 40 = 190 inches
- Total Current Inches = 34 + 41.5 + 2*(24.5) + 2*(12.5) + 41 = 34 + 41.5 + 49 + 25 + 41 = 190.5 inches
- Total Inches Lost = 190 – 190.5 = -0.5 inches
Interpretation:
The weight loss inches calculator shows a slight increase in total inches. However, looking at the individual measurements, Mark's waist and hips have decreased, indicating fat loss in those key areas. His thighs, arms, and chest have slightly increased, which is likely due to muscle gain from his training program. This scenario perfectly illustrates why using an inches calculator is vital – it shows that even if the total circumference doesn't decrease (or slightly increases), fat can still be lost while body composition improves. Mark should feel encouraged by his progress in fat reduction and muscle building. Understanding [body composition changes](link-to-body-composition-guide) is key here.
How to Use This Weight Loss Inches Calculator
Using the weight loss inches calculator is straightforward and can be a powerful tool for staying motivated on your health journey. Here's a step-by-step guide:
Step-by-Step Instructions:
- Gather Your Tools: You'll need a flexible measuring tape (like those used for sewing) and ensure it's not stretched out.
- Measure Accurately:
- Waist: Measure around your natural waistline, usually the narrowest part of your torso, typically just above the belly button. Breathe normally and don't suck in your stomach.
- Hips: Measure around the fullest part of your hips and buttocks. Ensure the tape is level.
- Thighs: Measure around the fullest part of one thigh. Record this measurement. Repeat for the other thigh.
- Arms: Measure around the fullest part of one upper arm (bicep area). Record this. Repeat for the other arm.
- Chest: Measure around the fullest part of your chest, usually across the nipples for men, or just below the bust line for women. Keep the tape level.
- Record Initial Measurements: Enter these starting measurements into the respective fields in the calculator (e.g., 'Initial Waist', 'Initial Hips', etc.).
- Record Current Measurements: Periodically (e.g., every 2-4 weeks), re-measure the same body parts using the same technique. Enter these updated measurements into the 'Current' fields.
- Calculate: Click the "Calculate Inch Loss" button.
How to Read Results:
The calculator will display:
- Individual Lost Inches: For each body part, you'll see how many inches you've lost.
- Total Inches Lost: This is the primary result, summing up all the inches lost across all measured areas. A positive number indicates progress.
- Total Initial Inches & Total Current Inches: These show the baseline and current totals for context.
- Progress Chart & Table: These visual aids help you see trends over time and which areas are changing the most.
Decision-Making Guidance:
Use the results to celebrate your successes and identify areas needing more attention. If you're not seeing the desired inch loss, it might be time to review your diet, exercise routine, or stress levels. Consistent tracking, even small losses, is key. Seeing a decrease in inches can be more motivating than the scale alone, especially when [building muscle](link-to-muscle-building-guide).
Key Factors That Affect Weight Loss Inches Results
While the weight loss inches calculator provides a quantitative measure of progress, several factors can influence the numbers beyond simple fat reduction. Understanding these nuances is crucial for accurate interpretation:
- Body Composition Changes (Muscle vs. Fat): This is arguably the most significant factor. Muscle is denser than fat, meaning you can lose fat and inches while gaining muscle, potentially resulting in stable or even slightly increased measurements in some areas (like arms or thighs) while losing inches in others (like the waist). The overall total inches lost might be lower than expected if muscle gain is substantial.
- Water Retention: Fluctuations in hydration levels, sodium intake, carbohydrate consumption, and hormonal cycles (especially for women) can significantly impact body measurements. Increased water retention can temporarily mask fat loss, making inches appear stable or even increase.
- Inflammation: Overtraining, injury, or certain dietary factors can lead to inflammation, causing temporary swelling and increased girth in affected areas. This can skew measurements and temporarily negate perceived inch loss.
- Dietary Habits: Beyond direct fat loss, what you eat affects water balance and inflammation. High-sodium foods can cause water retention, while a diet rich in anti-inflammatory foods can help reduce puffiness. Consuming adequate protein supports muscle maintenance and growth during weight loss.
- Exercise Type and Intensity: Strength training, as mentioned, can lead to muscle hypertrophy, potentially offsetting fat loss in terms of circumference. High-intensity interval training (HIIT) can be effective for fat burning, while steady-state cardio might impact fat loss differently. The type of exercise impacts which body parts might see the most significant changes.
- Measurement Consistency: The accuracy of your measurements is paramount. Factors like the time of day, how tightly you pull the tape, whether you are holding your breath, and the exact placement of the tape measure can introduce variability. Measuring at the same time under similar conditions (e.g., upon waking, before eating) is crucial for reliable tracking.
- Genetics and Body Shape: Individual genetic predispositions influence where the body tends to store and lose fat. Some people may naturally lose inches from their waist first, while others might see changes in their hips or thighs.
Frequently Asked Questions (FAQ)
Is losing inches more important than losing weight? +
Not necessarily "more important," but it provides a crucial, complementary perspective. Losing inches indicates fat loss and body recomposition, which is often the primary goal for health and aesthetics, especially when weight loss plateaus due to muscle gain. Both metrics are valuable.
How often should I measure myself? +
For best results and to avoid getting discouraged by daily fluctuations, measure yourself every 2 to 4 weeks. Consistency in timing (e.g., same day of the week, same time of day) and method is key.
Why am I losing weight but not inches? +
This can happen if you're gaining muscle while losing fat, or if water retention is masking fat loss. Muscle is denser than fat, so you can lose fat mass and inches without a significant drop in weight. It could also be due to hormonal changes or inflammation affecting measurements.
Why are my inches increasing in some areas but decreasing in others? +
This is common when engaging in a balanced fitness program. You might be losing fat (decreasing inches) in areas like the waist and hips, while simultaneously gaining muscle (increasing inches) in areas like arms, chest, or thighs due to strength training. This signifies positive body recomposition.
Does this calculator account for all body fat? +
No, the weight loss inches calculator only measures circumference at specific points. It's an indicator of overall fat loss and changes in body shape but doesn't precisely quantify total body fat percentage. For that, other methods like body fat calipers, bioelectrical impedance analysis (BIA), or DEXA scans are needed.
Can I track progress for specific body parts? +
Yes, the calculator breaks down inch loss for individual areas (waist, hips, thighs, etc.) in the results table. This allows you to see which areas are responding best to your efforts.
What is a "good" amount of inches to lose? +
A loss of 1-2 inches from the waist per month is often considered a healthy and sustainable rate. However, progress varies greatly. Focus on consistent, gradual loss rather than rapid changes. Celebrate any reduction you see!
How does this relate to overall health? +
Losing inches, particularly around the waist (visceral fat), is strongly linked to improved health markers, including reduced risk of heart disease, type 2 diabetes, and certain cancers. It's a key indicator of metabolic health improvement.
Related Tools and Internal Resources
var chartInstance = null; // Global variable to hold the chart instance
function validateInput(id, errorId, min, max) {
var input = document.getElementById(id);
var errorSpan = document.getElementById(errorId);
var value = parseFloat(input.value);
errorSpan.style.display = 'none'; // Hide error by default
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errorSpan.textContent = "This field cannot be empty.";
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if (isNaN(value)) {
errorSpan.textContent = "Please enter a valid number.";
errorSpan.style.display = 'block';
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if (value < 0) {
errorSpan.textContent = "Measurement cannot be negative.";
errorSpan.style.display = 'block';
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if (min !== undefined && value max) {
errorSpan.textContent = "Value too high. Maximum is " + max + ".";
errorSpan.style.display = 'block';
return false;
}
return true;
}
function calculateInches() {
var valid = true;
// Validate all inputs
valid = validateInput('initialWaist', 'initialWaistError', 0) && valid;
valid = validateInput('currentWaist', 'currentWaistError', 0) && valid;
valid = validateInput('initialHips', 'initialHipsError', 0) && valid;
valid = validateInput('currentHips', 'currentHipsError', 0) && valid;
valid = validateInput('initialThigh', 'initialThighError', 0) && valid;
valid = validateInput('currentThigh', 'currentThighError', 0) && valid;
valid = validateInput('initialArm', 'initialArmError', 0) && valid;
valid = validateInput('currentArm', 'currentArmError', 0) && valid;
valid = validateInput('initialChest', 'initialChestError', 0) && valid;
valid = validateInput('currentChest', 'currentChestError', 0) && valid;
if (!valid) {
// Clear results if validation fails
document.getElementById('totalInitialInches').textContent = "0.00";
document.getElementById('totalCurrentInches').textContent = "0.00";
document.getElementById('totalInchesLost').textContent = "0.00";
document.getElementById('primary-result').textContent = "Total Inches Lost: 0.00";
updateTable("0.00", "0.00", "0.00", "0.00", "0.00", "0.00", "0.00", "0.00", "0.00", "0.00");
updateChart([], []); // Clear chart
return;
}
// Get input values
var initialWaist = parseFloat(document.getElementById('initialWaist').value);
var currentWaist = parseFloat(document.getElementById('currentWaist').value);
var initialHips = parseFloat(document.getElementById('initialHips').value);
var currentHips = parseFloat(document.getElementById('currentHips').value);
var initialThigh = parseFloat(document.getElementById('initialThigh').value);
var currentThigh = parseFloat(document.getElementById('currentThigh').value);
var initialArm = parseFloat(document.getElementById('initialArm').value);
var currentArm = parseFloat(document.getElementById('currentArm').value);
var initialChest = parseFloat(document.getElementById('initialChest').value);
var currentChest = parseFloat(document.getElementById('currentChest').value);
// Calculate intermediate values
var totalInitialInches = initialWaist + initialHips + (2 * initialThigh) + (2 * initialArm) + initialChest;
var totalCurrentInches = currentWaist + currentHips + (2 * currentThigh) + (2 * currentArm) + currentChest;
var totalInchesLost = totalInitialInches – totalCurrentInches;
// Calculate individual lost inches
var waistLost = initialWaist – currentWaist;
var hipsLost = initialHips – currentHips;
var thighLostTotal = (2 * initialThigh) – (2 * currentThigh);
var armLostTotal = (2 * initialArm) – (2 * currentArm);
var chestLost = initialChest – currentChest;
// Update results display
document.getElementById('totalInitialInches').textContent = totalInitialInches.toFixed(2);
document.getElementById('totalCurrentInches').textContent = totalCurrentInches.toFixed(2);
document.getElementById('totalInchesLost').textContent = totalInchesLost.toFixed(2);
document.getElementById('primary-result').textContent = "Total Inches Lost: " + totalInchesLost.toFixed(2);
// Update table
updateTable(
initialWaist.toFixed(2), currentWaist.toFixed(2), waistLost.toFixed(2),
initialHips.toFixed(2), currentHips.toFixed(2), hipsLost.toFixed(2),
(2 * initialThigh).toFixed(2), (2 * currentThigh).toFixed(2), thighLostTotal.toFixed(2),
(2 * initialArm).toFixed(2), (2 * currentArm).toFixed(2), armLostTotal.toFixed(2),
initialChest.toFixed(2), currentChest.toFixed(2), chestLost.toFixed(2)
);
// Update chart data
var labels = ['Waist', 'Hips', 'Thighs', 'Arms', 'Chest'];
var initialData = [initialWaist, initialHips, (2 * initialThigh), (2 * initialArm), initialChest];
var currentData = [currentWaist, currentHips, (2 * currentThigh), (2 * currentArm), currentChest];
updateChart(labels, initialData, currentData);
}
function updateTable(waistInitial, waistCurrent, waistLost,
hipsInitial, hipsCurrent, hipsLost,
thighInitial, thighCurrent, thighLost,
armInitial, armCurrent, armLost,
chestInitial, chestCurrent, chestLost) {
document.getElementById('waistInitial').textContent = waistInitial;
document.getElementById('waistCurrent').textContent = waistCurrent;
document.getElementById('waistLost').textContent = waistLost;
document.getElementById('hipsInitial').textContent = hipsInitial;
document.getElementById('hipsCurrent').textContent = hipsCurrent;
document.getElementById('hipsLost').textContent = hipsLost;
document.getElementById('thighInitialTotal').textContent = thighInitial;
document.getElementById('thighCurrentTotal').textContent = thighCurrent;
document.getElementById('thighLostTotal').textContent = thighLost;
document.getElementById('armInitialTotal').textContent = armInitial;
document.getElementById('armCurrentTotal').textContent = armCurrent;
document.getElementById('armLostTotal').textContent = armLost;
document.getElementById('chestInitial').textContent = chestInitial;
document.getElementById('chestCurrent').textContent = chestCurrent;
document.getElementById('chestLost').textContent = chestLost;
}
function updateChart(labels, initialData, currentData) {
var ctx = document.getElementById('progressChart').getContext('2d');
// Destroy previous chart instance if it exists
if (chartInstance) {
chartInstance.destroy();
}
// Only create chart if data is available and valid
if (labels.length > 0 && initialData.length > 0 && currentData.length > 0) {
chartInstance = new Chart(ctx, {
type: 'bar', // Changed to bar for better comparison
data: {
labels: labels,
datasets: [{
label: 'Initial Measurement (in)',
data: initialData,
backgroundColor: 'rgba(0, 74, 153, 0.6)', // Primary color
borderColor: 'rgba(0, 74, 153, 1)',
borderWidth: 1
}, {
label: 'Current Measurement (in)',
data: currentData,
backgroundColor: 'rgba(40, 167, 69, 0.6)', // Success color
borderColor: 'rgba(40, 167, 69, 1)',
borderWidth: 1
}]
},
options: {
responsive: true,
maintainAspectRatio: true, // Adjust as needed
scales: {
y: {
beginAtZero: true,
title: {
display: true,
text: 'Measurement (inches)'
}
}
},
plugins: {
title: {
display: true,
text: 'Comparison of Initial vs. Current Body Measurements'
},
legend: {
position: 'top',
}
}
}
});
} else {
// If no data, ensure canvas is cleared or shows a message
ctx.clearRect(0, 0, ctx.canvas.width, ctx.canvas.height);
}
}
function copyResults() {
var resultsText = "— Inch Loss Calculator Results —\n\n";
resultsText += "Total Initial Inches: " + document.getElementById('totalInitialInches').textContent + "\n";
resultsText += "Total Current Inches: " + document.getElementById('totalCurrentInches').textContent + "\n";
resultsText += "Total Inches Lost: " + document.getElementById('totalInchesLost').textContent + "\n\n";
resultsText += "— Measurement Details —\n";
resultsText += "Waist: Lost " + document.getElementById('waistLost').textContent + " inches\n";
resultsText += "Hips: Lost " + document.getElementById('hipsLost').textContent + " inches\n";
resultsText += "Thighs (Total): Lost " + document.getElementById('thighLostTotal').textContent + " inches\n";
resultsText += "Arms (Total): Lost " + document.getElementById('armLostTotal').textContent + " inches\n";
resultsText += "Chest: Lost " + document.getElementById('chestLost').textContent + " inches\n\n";
resultsText += "Key Assumption: Measurements are taken consistently using the same method.\n";
// Use a temporary textarea to copy to clipboard
var tempTextArea = document.createElement("textarea");
tempTextArea.value = resultsText;
document.body.appendChild(tempTextArea);
tempTextArea.select();
try {
document.execCommand('copy');
alert('Results copied to clipboard!');
} catch (err) {
console.error('Failed to copy results: ', err);
alert('Failed to copy results. Please copy manually.');
}
document.body.removeChild(tempTextArea);
}
function resetForm() {
document.getElementById('initialWaist').value = ";
document.getElementById('currentWaist').value = ";
document.getElementById('initialHips').value = ";
document.getElementById('currentHips').value = ";
document.getElementById('initialThigh').value = ";
document.getElementById('currentThigh').value = ";
document.getElementById('initialArm').value = ";
document.getElementById('currentArm').value = ";
document.getElementById('initialChest').value = ";
document.getElementById('currentChest').value = ";
// Clear errors
document.getElementById('initialWaistError').textContent = ";
document.getElementById('currentWaistError').textContent = ";
document.getElementById('initialHipsError').textContent = ";
document.getElementById('currentHipsError').textContent = ";
document.getElementById('initialThighError').textContent = ";
document.getElementById('currentThighError').textContent = ";
document.getElementById('initialArmError').textContent = ";
document.getElementById('currentArmError').textContent = ";
document.getElementById('initialChestError').textContent = ";
document.getElementById('currentChestError').textContent = ";
// Reset results
document.getElementById('totalInitialInches').textContent = "0.00";
document.getElementById('totalCurrentInches').textContent = "0.00";
document.getElementById('totalInchesLost').textContent = "0.00";
document.getElementById('primary-result').textContent = "Total Inches Lost: 0.00";
updateTable("0.00", "0.00", "0.00", "0.00", "0.00", "0.00", "0.00", "0.00", "0.00", "0.00");
updateChart([], []); // Clear chart
}
// Add event listeners for real-time updates
document.getElementById('initialWaist').addEventListener('input', calculateInches);
document.getElementById('currentWaist').addEventListener('input', calculateInches);
document.getElementById('initialHips').addEventListener('input', calculateInches);
document.getElementById('currentHips').addEventListener('input', calculateInches);
document.getElementById('initialThigh').addEventListener('input', calculateInches);
document.getElementById('currentThigh').addEventListener('input', calculateInches);
document.getElementById('initialArm').addEventListener('input', calculateInches);
document.getElementById('currentArm').addEventListener('input', calculateInches);
document.getElementById('initialChest').addEventListener('input', calculateInches);
document.getElementById('currentChest').addEventListener('input', calculateInches);
// Initialize FAQ toggles
var faqItems = document.querySelectorAll('.faq-item h3');
for (var i = 0; i < faqItems.length; i++) {
faqItems[i].addEventListener('click', function() {
var parent = this.parentElement;
parent.classList.toggle('open');
var content = parent.querySelector('p');
if (content.style.display === 'block') {
content.style.display = 'none';
} else {
content.style.display = 'block';
}
});
}
// Load Chart.js library dynamically if not already present
(function loadChartJS() {
if (typeof Chart === 'undefined') {
var script = document.createElement('script');
script.src = 'https://cdn.jsdelivr.net/npm/chart.js@3.7.1/dist/chart.min.js'; // Use a specific version
script.onload = function() {
// Chart.js loaded, now initialize
calculateInches(); // Initial calculation on load
};
script.onerror = function() {
console.error('Failed to load Chart.js library.');
// Optionally, display a message to the user
};
document.head.appendChild(script);
} else {
calculateInches(); // Chart.js already loaded, perform initial calculation
}
})();