2lb a Week Weight Loss Calculator

Determine the calorie deficit needed and the time it takes to achieve your weight loss goals, aiming for a consistent 2lb per week.

Weekly Progress Breakdown

Week	Starting Weight (lbs)	Ending Weight (lbs)	Total Weight Lost (lbs)	Cumulative Deficit (kcal)

What is the 2lb a Week Weight Loss Goal?

The goal of losing 2lb a week is an ambitious yet often achievable target for significant weight loss, particularly for individuals with a substantial amount of weight to lose. This rate of weight loss is generally considered safe and sustainable for many, provided it's achieved through a combination of a healthy diet and regular physical activity. It represents a substantial calorie deficit each week, necessitating a dedicated approach. It's crucial to understand that this is a guideline, and individual results can vary based on numerous physiological and lifestyle factors. This calculator helps you map out the feasibility and timeline for achieving a 2lb a week weight loss.

Who should use it: This calculator is ideal for individuals who have a significant amount of weight to lose and are seeking a structured, rapid yet safe weight loss plan. It can also be useful for those looking to understand the commitment required for such a goal. People with specific health conditions or those undertaking extreme diets should consult with a healthcare professional before setting such aggressive weight loss targets. The 2lb a week weight loss calculator provides a numerical roadmap.

Common misconceptions: A primary misconception is that losing 2lb a week means cutting out entire food groups or starving oneself. In reality, it's about creating a consistent, manageable calorie deficit. Another misconception is that the weight lost is purely fat; initial rapid weight loss often includes water and muscle mass. Sustainable weight loss focuses on fat reduction, and aiming for 2lb a week requires a significant, consistent energy deficit.

2lb a Week Weight Loss Formula and Mathematical Explanation

The calculation for achieving a 2lb a week weight loss hinges on creating a significant daily calorie deficit. The fundamental principle is that one pound of body fat is equivalent to approximately 3500 calories. To lose 2 pounds per week, you need to create a total weekly deficit of 7000 calories (2 lbs/week * 3500 kcal/lb).

This weekly deficit is then divided by 7 to determine the required daily calorie deficit.

Steps:**

1. Calculate the total weekly calorie deficit needed: Weekly Deficit = Target Weight Loss (lbs/week) * 3500 kcal/lb
2. Determine the daily calorie deficit: Daily Deficit = Weekly Deficit / 7 days
3. Calculate your Total Daily Energy Expenditure (TDEE), or simply your estimated daily calorie burn: Daily Burn = Daily Calories Consumed + Daily Calories Burned (Exercise + NEAT) (This simplifies to your calculated net deficit after food intake).
4. Calculate the actual daily deficit: Actual Daily Deficit = Daily Calories Consumed - Daily Calories Burned - Target Daily Calorie Intake. A more direct way is: Actual Daily Deficit = (Daily Calories Consumed - Daily Calories Burned) - (TDEE - Target Daily Deficit). Or most simply, sum your intake and expenditure relative to maintenance. A more practical approach for the calculator is: Total Daily Deficit = Daily Calories Burned (from all sources) - Daily Calories Consumed.
5. Calculate the estimated time to reach the target weight: Time (weeks) = Total Weight to Lose (lbs) / Target Weight Loss Rate (lbs/week).

Variables Table:

Variable	Meaning	Unit	Typical Range
Current Weight	Your starting body weight.	lbs	50 – 500+
Target Weight	Your desired body weight.	lbs	40 – 400+
Daily Calories Consumed	Average daily intake from food and beverages.	kcal	1200 – 3500+
Daily Calories Burned	Total calories expended through basal metabolism, exercise, and NEAT.	kcal	1500 – 4000+
Weight Loss Rate	The desired rate of weight loss per week.	lbs/week	0.5 – 2.0 (for this calculator)
Calorie Equivalence	Estimated calories in one pound of body fat.	kcal/lb	~3500

Practical Examples of 2lb a Week Weight Loss

Understanding the 2lb a week weight loss calculator through real-world scenarios clarifies its application.

Example 1: John's Journey

John currently weighs 220 lbs and wants to reach 180 lbs. He consumes approximately 2500 calories per day and burns about 700 calories through exercise and daily activities. He aims for a 2lb per week loss.

• Weight to Lose: 220 lbs – 180 lbs = 40 lbs
• Daily Calorie Intake: 2500 kcal
• Daily Calorie Expenditure: 700 kcal
• Net Daily Calorie Intake (Simplified view of consumption vs expenditure): 2500 consumed – 700 burned = 1800 kcal deficit from intake alone (This is a simplification; true TDEE calculation is more complex). The calculator uses total intake vs total expenditure for deficit.
• Actual Daily Deficit: (2500 kcal consumed + maintenance calories) – (2500 kcal consumed – 700 kcal burned). A more direct method: Total Calorie deficit is `Daily Calories Burned – Daily Calories Consumed` IF `Daily Calories Burned > Daily Calories Consumed`. The calculator calculates `(Daily Calories Consumed + Daily Calories Burned) – MaintenanceCalories`. For simplicity, we calculate total deficit from intake and activity: If John consumes 2500 and burns 700 from activity, his *net intake from food* effectively becomes 1800 if we consider his baseline expenditure. But if his *total* daily expenditure (including basal metabolic rate + activity) is, say, 3000 kcal, and he consumes 2500 kcal, his deficit is 500 kcal. If his activity adds 700 kcal, his *effective total expenditure* becomes 3700 kcal. So deficit = 3700 – 2500 = 1200 kcal.
• Using the calculator logic: Total Daily Burn = 2500 (assumed maintenance calories based on current weight) + 700 (activity) = 3200 kcal. Daily Intake = 2500 kcal. Daily Deficit = 3200 – 2500 = 700 kcal.
• Weekly Deficit: 700 kcal/day * 7 days = 4900 kcal.
• Weight Loss Rate: 4900 kcal / 3500 kcal/lb = 1.4 lbs/week.
• Interpretation: John's current habits will lead to approximately 1.4 lbs of loss per week, not the 2 lbs he desires. To reach 2 lbs/week, he needs a 1400 kcal daily deficit (2 lbs * 3500 kcal / 7 days). He would need to either reduce his intake by approximately 700 kcal (to 1800 kcal) or increase his expenditure by 700 kcal (to 1400 kcal burned), or a combination, to achieve his goal.
• Weeks to Target (at 1.4 lbs/week): 40 lbs / 1.4 lbs/week ≈ 28.6 weeks.
• Weeks to Target (at desired 2 lbs/week): 40 lbs / 2 lbs/week = 20 weeks.

Example 2: Sarah's Consistent Effort

Sarah weighs 160 lbs and aims for 140 lbs. She carefully tracks her intake to 1800 calories daily and averages 600 calories burned through a consistent workout routine and active lifestyle.

• Weight to Lose: 160 lbs – 140 lbs = 20 lbs
• Daily Calorie Intake: 1800 kcal
• Daily Calorie Expenditure: 600 kcal
• Using the calculator logic: Assume Sarah's TDEE at 160lbs is roughly 2200 kcal. Daily Deficit = (2200 + 600) – 1800 = 1000 kcal.
• Weekly Deficit: 1000 kcal/day * 7 days = 7000 kcal.
• Weight Loss Rate: 7000 kcal / 3500 kcal/lb = 2.0 lbs/week.
• Interpretation: Sarah is perfectly on track to achieve her goal of 2 lbs of weight loss per week. Her consistent adherence to her calorie target and exercise routine creates the necessary deficit.
• Weeks to Target (at 2.0 lbs/week): 20 lbs / 2.0 lbs/week = 10 weeks.

How to Use This 2lb a Week Weight Loss Calculator

Using the 2lb a week weight loss calculator is straightforward. Follow these steps to get your personalized projection:

1. Enter Current Weight: Input your current body weight in pounds (lbs). Ensure accuracy for the best results.
2. Enter Target Weight: Input the weight in pounds (lbs) you aim to achieve.
3. Enter Daily Calories Consumed: Provide an honest estimate of your average daily calorie intake from all food and beverages.
4. Enter Daily Calories Burned: This includes calories burned from structured exercise sessions and Non-Exercise Activity Thermogenesis (NEAT) – everyday movements like walking, fidgeting, and standing.
5. Click "Calculate": Once all fields are populated, click the "Calculate" button.

How to Read Results:

• Main Result (Highlighted): This shows the estimated number of weeks it will take to reach your target weight, assuming you maintain the specified calorie deficit.
• Weight to Lose: The total difference between your current and target weight.
• Weekly Calorie Deficit: The average daily calorie deficit multiplied by seven, indicating your total weekly energy shortfall.
• Estimated Weeks to Reach Target: The projected timeframe based on your inputs and the 2lb/week goal.
• Chart: Visualizes your projected weight loss week by week.
• Table: Provides a detailed breakdown of your progress over time.

Decision-Making Guidance: If the calculated time to reach your target seems too long, you may need to consider increasing your daily calorie deficit. This can be achieved by further reducing calorie intake or increasing physical activity. Conversely, if the timeline is shorter than desired, ensure your calorie deficit is sustainable and not overly aggressive, which could lead to muscle loss or nutrient deficiencies. Always consult with a healthcare provider or registered dietitian for personalized advice, especially when aiming for significant weight loss. This weight loss projection tool is a guide, not a definitive medical plan.

Key Factors That Affect 2lb a Week Weight Loss Results

While the 2lb a week weight loss calculator provides a valuable estimate, several real-world factors can influence your actual progress:

1. Metabolic Adaptation: As you lose weight, your metabolism may slow down slightly. Your body requires fewer calories to function at a lower weight, meaning your TDEE decreases, potentially reducing your calorie deficit and slowing progress if adjustments aren't made.
2. Muscle Mass vs. Fat Loss: The calculator assumes all weight lost is fat, which relies on the 3500 kcal/lb principle. However, rapid weight loss can sometimes lead to muscle loss, especially without adequate protein intake and resistance training. Muscle is metabolically active, so preserving it is key for long-term success.
3. Hormonal Fluctuations: Hormones like cortisol, thyroid hormones, and sex hormones can significantly impact appetite, metabolism, and fat storage. Stress, sleep quality, and hormonal imbalances can hinder weight loss efforts.
4. Dietary Adherence and Accuracy: Accurately tracking calorie intake is challenging. Miscalculations, "hidden" calories in food, and inconsistent adherence to your diet plan will directly affect your calorie deficit and, consequently, your weight loss rate.
5. Exercise Consistency and Intensity: The calories burned from exercise are estimates. Actual expenditure varies based on the intensity, duration, and type of activity. Inconsistent workouts or lower-than-expected intensity will reduce the overall deficit.
6. Water Retention: Sodium intake, hydration levels, menstrual cycles (for women), and even intense exercise can cause temporary water retention, masking fat loss on the scale and making weekly progress seem inconsistent.
7. Sleep Quality: Poor sleep can disrupt hunger hormones (ghrelin and leptin), increase cravings for high-calorie foods, and impair recovery, all of which can negatively impact weight loss efforts.
8. Medications and Health Conditions: Certain medications (e.g., steroids, some antidepressants) and underlying health conditions (e.g., hypothyroidism, PCOS) can affect metabolism and body weight, making weight loss more challenging.

Frequently Asked Questions (FAQ)

Is losing 2lb a week sustainable?

For many individuals, especially those with a considerable amount of weight to lose, a 2lb a week loss is sustainable for a period. However, it requires a significant daily calorie deficit (around 1000 calories). For individuals closer to their ideal weight, a slower rate (1-1.5lb/week) is often more sustainable and easier to maintain long-term.

What is the calorie deficit needed for 2lb a week weight loss?

To lose 2 pounds of fat per week, you need a weekly calorie deficit of 7000 calories (2 lbs * 3500 kcal/lb). This translates to an average daily deficit of approximately 1000 calories (7000 kcal / 7 days).

Can I lose 2lb a week by just dieting?

Yes, it's possible to achieve a 1000-calorie daily deficit through diet alone if your TDEE is sufficiently high. However, combining diet with exercise is generally recommended for overall health, preserving muscle mass, and improving body composition. Relying solely on diet for such a large deficit might lead to nutrient deficiencies or unsustainable hunger.

What happens if I eat less than 1200 calories a day?

Consuming fewer than 1200 calories per day (for women) or 1500 calories per day (for men) without medical supervision is generally not recommended. Very low-calorie diets can lead to loss of muscle mass, nutrient deficiencies, fatigue, gallstones, and a slowed metabolism. It's crucial to get adequate nutrition.

How does exercise contribute to losing 2lb a week?

Exercise directly increases your daily calorie expenditure, contributing to your overall calorie deficit. For example, burning an extra 500 calories per day through exercise, combined with a 500-calorie reduction from diet, can help you reach the 1000-calorie daily deficit needed for 2lb/week loss. It also offers numerous health benefits beyond weight loss.

What if my weight loss stalls even with a consistent deficit?

Weight loss plateaus can occur due to metabolic adaptation, water retention, inaccurate calorie tracking, or hormonal changes. It's important to reassess your intake and expenditure, ensure adequate sleep and stress management, and consider consulting a professional. Sometimes a brief calorie reset or change in exercise routine can help.

Is the 3500 calorie rule accurate for everyone?

The 3500 calorie rule is a widely used approximation. However, the actual number of calories in a pound of fat can vary slightly between individuals and can change as body composition shifts. While it serves as a good general guideline for the 2lb a week weight loss calculator, it's not an exact science for every person.

Should I aim for 2lb a week if I only have 10lb to lose?

If you only have a small amount of weight to lose (e.g., 10 lbs), aiming for 2lb a week might be too aggressive and potentially lead to muscle loss or unhealthy practices. A more moderate goal of 0.5-1lb per week is often more sustainable and healthier for smaller amounts of weight loss. This weight loss timeline calculator can show you the difference.

Related Tools and Internal Resources

• BMI Calculator

  Understand your Body Mass Index (BMI) and its relation to your weight category.

• Calorie Deficit Calculator

  Calculate your personalized daily calorie deficit for weight loss based on your TDEE.

• Macronutrient Calculator

  Determine the ideal breakdown of carbohydrates, proteins, and fats for your diet.

• TDEE Calculator

  Estimate your Total Daily Energy Expenditure to help plan your calorie intake.

• Water Intake Calculator

  Find out your recommended daily water intake for optimal health and hydration.

• Healthy Weight Calculator

  Determine a healthy weight range based on your height and other factors.

var chartInstance = null; // To hold the chart instance function getElement(id) { return document.getElementById(id); } function validateInput(inputId, errorId, minValue, maxValue, isInteger) { var input = getElement(inputId); var errorElement = getElement(errorId); var value = parseFloat(input.value); errorElement.style.display = 'none'; input.style.borderColor = '#ccc'; if (input.value === "") { errorElement.textContent = "This field is required."; errorElement.style.display = 'block'; input.style.borderColor = '#dc3545'; return false; } if (isNaN(value)) { errorElement.textContent = "Please enter a valid number."; errorElement.style.display = 'block'; input.style.borderColor = '#dc3545'; return false; } if (value maxValue) { errorElement.textContent = "Value is too high."; errorElement.style.display = 'block'; input.style.borderColor = '#dc3545'; return false; } if (isInteger && !Number.isInteger(value)) { errorElement.textContent = "Please enter a whole number."; errorElement.style.display = 'block'; input.style.borderColor = '#dc3545'; return false; } return true; } function calculateWeightLoss() { var currentWeightInput = getElement("currentWeight"); var targetWeightInput = getElement("targetWeight"); var dailyCaloriesConsumedInput = getElement("dailyCaloriesConsumed"); var dailyCaloriesBurnedInput = getElement("dailyCaloriesBurned"); var currentWeightError = getElement("currentWeightError"); var targetWeightError = getElement("targetWeightError"); var dailyCaloriesConsumedError = getElement("dailyCaloriesConsumedError"); var dailyCaloriesBurnedError = getElement("dailyCaloriesBurnedError"); var isValid = true; isValid = validateInput("currentWeight", "currentWeightError", 0) && isValid; isValid = validateInput("targetWeight", "targetWeightError", 0) && isValid; isValid = validateInput("dailyCaloriesConsumed", "dailyCaloriesConsumedError", 0) && isValid; isValid = validateInput("dailyCaloriesBurned", "dailyCaloriesBurnedError", 0) && isValid; if (!isValid) { return; } var currentWeight = parseFloat(currentWeightInput.value); var targetWeight = parseFloat(targetWeightInput.value); var dailyCaloriesConsumed = parseFloat(dailyCaloriesConsumedInput.value); var dailyCaloriesBurned = parseFloat(dailyCaloriesBurnedInput.value); var weightToLose = currentWeight – targetWeight; if (weightToLose <= 0) { alert("Target weight must be less than current weight."); targetWeightInput.style.borderColor = '#dc3545'; targetWeightError.textContent = "Target weight must be lower than current weight."; targetWeightError.style.display = 'block'; return; } var caloriesPerPound = 3500; var targetWeeklyLoss = 2; // lbs per week var targetWeeklyDeficit = targetWeeklyLoss * caloriesPerPound; var targetDailyDeficit = targetWeeklyDeficit / 7; // Calculate actual daily deficit based on inputs // This simplified model assumes 'dailyCaloriesBurned' is *additional* to basal metabolic rate, // and we are comparing total intake vs total expenditure. // A more complex model would use a TDEE calculator first. // For this calculator's context, we'll calculate the deficit created by intake vs expenditure. var actualDailyDeficit = (dailyCaloriesConsumed + dailyCaloriesBurned) – currentWeight * 10; // Approximation: Assume BMR ~10 kcal/lb as a very rough baseline, THIS IS A SIMPLIFICATION FOR DEMO. A proper TDEE calc is needed for accuracy. // A better approach for this calculator: // The deficit is created by Total Intake vs Total Expenditure. // Total Expenditure = Intake – (Intake – Expenditure) // Let's use the formula: Daily Deficit = (Calories Consumed + Calories Burned) – Maintenance Calories. // Since we don't have maintenance calories, we use the direct difference assuming expenditure includes everything. // This is still problematic. The *best* interpretation for this calculator's intent: // Daily deficit = (Energy In) – (Energy Out) // Energy Out = Baseline Metabolic Rate + Activity Burn // Energy In = Calories Consumed // We lack Baseline Metabolic Rate. // Let's RE-INTERPRET: The calculator asks for calories CONSUMED and calories BURNED (via activity). // The deficit is the net effect. A common way to view this is: // Deficit = (Calories Consumed + Calories Burned from Activity) – Some Baseline. // OR simply: Deficit = Energy Out – Energy In. // Let's use a simpler, direct interpretation: The calculator inputs represent the TOTAL calories you are consuming (intake) and the TOTAL calories you are expending (baseline + activity). // Thus, the Daily Deficit = Daily Calories Burned – Daily Calories Consumed. // If Daily Calories Burned is LESS than Consumed, there is no deficit. var calculatedDailyDeficit = dailyCaloriesBurned – dailyCaloriesConsumed; // This is the NET deficit from food and activity. var weeklyDeficit = calculatedDailyDeficit * 7; var actualWeightLossPerWeek = weeklyDeficit / caloriesPerPound; var weeksToTarget = weightToLose / actualWeightLossPerWeek; var resultsContainer = getElement("resultsContainer"); var chartContainer = getElement("chartContainer"); var tableContainer = getElement("tableContainer"); var mainResultElement = getElement("mainResult"); var weightDifferenceElement = getElement("weightDifference").querySelector("span"); var weeklyDeficitElement = getElement("weeklyDeficit").querySelector("span"); var weeksToTargetElement = getElement("weeksToTarget").querySelector("span"); mainResultElement.textContent = isNaN(weeksToTarget) || !isFinite(weeksToTarget) ? "–" : weeksToTarget.toFixed(1) + " weeks"; weightDifferenceElement.textContent = weightToLose.toFixed(1) + " lbs"; weeklyDeficitElement.textContent = weeklyDeficit.toFixed(0) + " kcal"; weeksToTargetElement.textContent = isNaN(weeksToTarget) || !isFinite(weeksToTarget) ? "–" : weeksToTarget.toFixed(1); resultsContainer.style.display = "block"; chartContainer.style.display = "block"; tableContainer.style.display = "block"; updateChartAndTable(weightToLose, actualWeightLossPerWeek, weeksToTarget); } function updateChartAndTable(weightToLose, actualWeightLossPerWeek, totalWeeks) { var canvas = getElement("weightLossChart"); var ctx = canvas.getContext("2d"); // Destroy previous chart instance if it exists if (chartInstance) { chartInstance.destroy(); } var labels = []; var weightData = []; var cumulativeDeficitData = []; var progressTableBody = getElement("progressTable").getElementsByTagName('tbody')[0]; progressTableBody.innerHTML = ''; // Clear previous table rows var currentWeight = parseFloat(getElement("currentWeight").value); var startWeight = currentWeight; var totalDeficitAccrued = 0; var currentWeek = 1; // Limit chart to a reasonable number of weeks to prevent performance issues and clutter var maxWeeksToShow = Math.min(Math.ceil(totalWeeks) + 2, 52); // Show up to a year, or a bit beyond the target for (var i = 0; i 0) { totalDeficitAccrued += weeklyDeficit; } cumulativeDeficitData.push(totalDeficitAccrued); if (i > 0 && i totalWeeks && i 0) { // Add rows for weeks after target is theoretically met, showing continued projection var startingWeightThisWeek = startWeight – (actualWeightLossPerWeek * (i – 1)); var endingWeightThisWeek = startWeight – (actualWeightLossPerWeek * i); var weightLostThisWeek = actualWeightLossPerWeek; var weeklyDeficitForTable = weeklyDeficit; var row = progressTableBody.insertRow(); row.insertCell(0).textContent = i; row.insertCell(1).textContent = startingWeightThisWeek.toFixed(1); row.insertCell(2).textContent = endingWeightThisWeek.toFixed(1); row.insertCell(3).textContent = weightLostThisWeek.toFixed(1); row.insertCell(4).textContent = weeklyDeficitForTable.toFixed(0); } else if (i === 0) { // Row for starting point var row = progressTableBody.insertRow(); row.insertCell(0).textContent = i; row.insertCell(1).textContent = startWeight.toFixed(1); row.insertCell(2).textContent = startWeight.toFixed(1); row.insertCell(3).textContent = 0; row.insertCell(4).textContent = 0; } } // Ensure the target weight is plotted accurately if it falls between weeks var targetWeightValue = parseFloat(getElement("targetWeight").value); if (!isNaN(targetWeightValue) && targetWeightValue 0) { var targetWeekExact = totalWeeks; var targetLabel = "Week " + targetWeekExact.toFixed(1); if (!labels.includes(targetLabel)) { // Avoid duplicate labels if it aligns with a whole week labels.push(targetLabel); weightData.push(targetWeightValue); cumulativeDeficitData.push(totalDeficitAccrued); // Approximate cumulative deficit at this point } } // Adjust the y-axis to better fit the data var minY = Math.min(…weightData) – 5; var maxY = Math.max(…weightData) + 5; if (minY < 0) minY = 0; chartInstance = new Chart(ctx, { type: 'line', data: { labels: labels, datasets: [{ label: 'Projected Weight (lbs)', data: weightData, borderColor: '#004a99', backgroundColor: 'rgba(0, 74, 153, 0.2)', fill: true, tension: 0.1 }, { label: 'Target Weight Line', data: Array(labels.length).fill(targetWeightValue), // Horizontal line for target borderColor: '#28a745', borderDash: [5, 5], fill: false, tension: 0 }] }, options: { responsive: true, maintainAspectRatio: false, scales: { y: { beginAtZero: false, title: { display: true, text: 'Weight (lbs)' }, min: minY, max: maxY }, x: { title: { display: true, text: 'Time' } } }, plugins: { legend: { position: 'top', }, title: { display: true, text: 'Weight Loss Progression Over Time' } } } }); } function resetForm() { getElement("currentWeight").value = "180"; getElement("targetWeight").value = "160"; getElement("dailyCaloriesConsumed").value = "2000"; getElement("dailyCaloriesBurned").value = "500"; // Reset errors getElement("currentWeightError").style.display = 'none'; getElement("targetWeightError").style.display = 'none'; getElement("dailyCaloriesConsumedError").style.display = 'none'; getElement("dailyCaloriesBurnedError").style.display = 'none'; getElement("currentWeight").style.borderColor = '#ccc'; getElement("targetWeight").style.borderColor = '#ccc'; getElement("dailyCaloriesConsumed").style.borderColor = '#ccc'; getElement("dailyCaloriesBurned").style.borderColor = '#ccc'; getElement("resultsContainer").style.display = "none"; getElement("chartContainer").style.display = "none"; getElement("tableContainer").style.display = "none"; if (chartInstance) { chartInstance.destroy(); chartInstance = null; } } function copyResults() { var mainResult = getElement("mainResult").innerText; var weightDifference = getElement("weightDifference").innerText; var weeklyDeficit = getElement("weeklyDeficit").innerText; var weeksToTarget = getElement("weeksToTarget").innerText; var assumption1 = getElement("assumption1").innerText; var assumption2 = getElement("assumption2").innerText; var assumption3 = getElement("assumption3").innerText; var copyText = `— Weight Loss Projection — ${mainResult} ${weightDifference} ${weeklyDeficit} ${weeksToTarget} — Key Assumptions — ${assumption1} ${assumption2} ${assumption3} `; navigator.clipboard.writeText(copyText).then(function() { alert("Results copied to clipboard!"); }, function(err) { console.error("Failed to copy: ", err); alert("Failed to copy results. Please copy manually."); }); } // Initial calculation on page load if fields have default values document.addEventListener('DOMContentLoaded', function() { // Check if default values are present and trigger calculation if (getElement("currentWeight").value && getElement("targetWeight").value && getElement("dailyCaloriesConsumed").value && getElement("dailyCaloriesBurned").value) { calculateWeightLoss(); } });