Steps to Walk to Lose Weight Calculator

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Steps to Walk to Lose Weight Calculator

Determine the daily steps needed to achieve your weight loss goals by walking.

Calculate Your Walking Steps for Weight Loss

Enter your weight in kilograms (kg).
Enter your desired weight in kilograms (kg).
0.5 kg (approx. 1 lb) 1 kg (approx. 2 lbs) 1.5 kg (approx. 3 lbs) Select your realistic weekly weight loss target.
Slow (4 km/h) Moderate (5 km/h) Brisk (6 km/h) Choose your typical pace while walking.
Enter the total minutes you plan to walk each day.
This can vary; 1300 steps/km is a common average.

Your Weight Loss Walking Plan

Estimated Daily Steps Needed: steps
Total Weight to Lose: kg
Total Calorie Deficit Required: kcal
Calorie Deficit Per Week: kcal
Estimated Daily Calorie Burn from Walking: kcal
Estimated Daily Steps from Walking: steps
Additional Daily Steps Needed: steps

Formula Explanation:

To lose 1 kg of fat, approximately 7700 kcal deficit is needed. This calculator determines your total deficit based on weight to lose, then calculates daily walking requirements to achieve your weekly goal, factoring in your walking speed, duration, and average steps per km. The 'Additional Daily Steps Needed' represent the difference between your target daily steps and those gained from your planned walk.

Key Assumptions:

  • 1 kg of fat is equivalent to 7700 kcal.
  • Walking speed and duration remain constant.
  • Average steps per kilometer is fixed.
  • Dietary intake remains consistent and does not significantly change calorie intake.
  • No other physical activity is factored in.

Estimated Calorie Burn vs. Steps

Calorie Burn (kcal) Steps
Weight Loss Progress Tracker
Week Target Steps/Day Estimated Steps/Day (Walk) Remaining Steps/Day Estimated Weight Lost (kg)

What is the Steps to Walk to Lose Weight Calculator?

The Steps to Walk to Lose Weight Calculator is a specialized online tool designed to help individuals understand and quantify the physical activity required, specifically through walking, to achieve their weight loss goals. It translates abstract weight loss targets into concrete, actionable daily step counts. This calculator is particularly useful for those who prefer walking as their primary method of exercise or who want to incorporate more movement into their daily routine to manage their weight.

Who should use it? Anyone looking to lose weight, improve their fitness, or understand the relationship between physical activity and calorie expenditure. This includes individuals new to exercise, those seeking to increase their daily step count, or people wanting a personalized estimate of how much they need to walk to reach a specific weight goal. It's also beneficial for individuals who may have limitations with high-impact exercises, making walking a more accessible option.

Common misconceptions about walking for weight loss often include believing that walking alone is insufficient, or that only intense, long-duration walks yield results. Many underestimate the cumulative effect of consistent, moderate walking. Another misconception is that one must reach an extremely high step count (e.g., 10,000 steps) regardless of individual factors, when in reality, the optimal number is personalized. This calculator aims to debunk these by providing tailored recommendations based on personal data and goals, emphasizing that consistent effort, tailored to individual needs, is key.

Steps to Walk to Lose Weight Calculator Formula and Mathematical Explanation

The core principle behind this calculator is the energy balance equation: weight loss occurs when calorie expenditure exceeds calorie intake. Walking contributes to calorie expenditure. The formula integrates several factors to provide a personalized step count.

Step-by-Step Derivation:

  1. Calculate Total Weight to Lose: This is simply the difference between the current weight and the target weight.
    Total Weight to Lose (kg) = Current Weight (kg) - Target Weight (kg)
  2. Calculate Total Calorie Deficit Required: Knowing that approximately 7700 kcal are needed to lose 1 kg of body fat, the total deficit is calculated.
    Total Calorie Deficit (kcal) = Total Weight to Lose (kg) * 7700 kcal/kg
  3. Determine Weekly Calorie Deficit: This is derived from the desired weekly weight loss goal.
    Weekly Calorie Deficit (kcal) = Desired Weight Loss Per Week (kg) * 7700 kcal/kg
  4. Calculate Daily Calorie Deficit Target: This is the weekly target divided by 7 days.
    Daily Calorie Deficit Target (kcal) = Weekly Calorie Deficit (kcal) / 7
  5. Estimate Daily Calorie Burn from Walking: This is calculated based on walking duration, speed, and a general estimation of calories burned per hour per kilometer. A common approximation for moderate walking (5 km/h) is around 300-400 kcal per hour, but this calculator uses a more direct step-based calculation. First, we calculate steps per km, then distance walked, then approximate burn.
    Distance Walked (km) = (Walking Duration (min) / 60 min/hr) * Walking Speed (km/hr)
    Steps from Planned Walk = Distance Walked (km) * Average Steps Per Km
    Estimated Daily Walking Burn (kcal) = Steps from Planned Walk * (Approx. kcal per step) *Note: The 'Approx. kcal per step' is an internal estimation derived from average metabolic rates for walking. A simplified approach directly relates duration and speed to burn, which is often more practical. For this calculator, we'll use a slightly simplified model that ties steps directly to burn estimation.* Let's refine this: A common estimate is around 0.04-0.05 kcal per step. We will use 0.045 kcal/step as a general average.
    Estimated Daily Walking Burn (kcal) = Steps from Planned Walk * 0.045 kcal/step Alternatively, we can use a formula based on METs (Metabolic Equivalents), where walking at 5 km/h is about 3.5 METs. Calories burned per minute = (METs * 3.5 * Weight in kg) / 200.
    Calorie Burn from Walk (kcal) = (Walking Duration (min) / 60) * METs * 3.5 * Weight (kg) / 200 * 60 (to adjust calculation for METs definition) Let's use a more direct step-based approach for simplicity and user-friendliness, assuming the steps are the primary output desired.
    Steps from Planned Walk = (Walking Duration (min) / 60) * Walking Speed (km/hr) * Avg Steps Per Km
    Estimated Daily Walking Burn (kcal) = Steps from Planned Walk * 0.045 (Using 0.045 kcal/step as a general approximation)
  6. Calculate Total Daily Step Goal: This combines the steps from the planned walk with the additional steps needed to meet the overall daily calorie deficit target.
    Additional Steps Needed (Steps) = (Daily Calorie Deficit Target (kcal) - Estimated Daily Walking Burn (kcal)) / 0.045 kcal/step
    Total Daily Steps Needed = Steps from Planned Walk + Additional Steps Needed

Variables Table:

Variable Meaning Unit Typical Range
Current Weight The user's starting body weight. kg 30 – 200+
Target Weight The desired body weight. kg 30 – 200+
Desired Weight Loss Per Week The target rate of weight loss. kg/week 0.5 – 2.0
Walking Speed Average pace during walking sessions. km/h 3 – 7
Daily Walking Time Duration of walking in minutes per day. minutes 15 – 120
Average Steps Per Km Estimated steps taken to cover one kilometer. steps/km 1000 – 1500
Total Weight to Lose The total amount of weight to be shed. kg 1 – 50+
Total Calorie Deficit Required Total energy deficit needed to reach the target weight. kcal 7700 – 385000+
Weekly Calorie Deficit The daily calorie deficit required to meet the weekly goal. kcal/week 3850 – 15400+
Daily Calorie Deficit Target The average daily calorie deficit needed. kcal/day 550 – 2200+
Estimated Daily Walking Burn Approximate calories burned during the planned walk. kcal/day 100 – 800+
Steps from Planned Walk Total steps accumulated during the planned walking duration. steps 1000 – 15000+
Additional Steps Needed Steps required beyond the planned walk to meet the daily deficit. steps 0 – 20000+
Primary Result (Total Daily Steps Needed) The total recommended daily steps to achieve weight loss goals. steps/day 5000 – 25000+

Practical Examples (Real-World Use Cases)

Let's illustrate how the Steps to Walk to Lose Weight Calculator works with two distinct scenarios:

Example 1: Sarah – Moderate Weight Loss Goal

Sarah weighs 75 kg and wants to reach 70 kg, a total loss of 5 kg. She aims for a sustainable weight loss of 0.75 kg per week (though the calculator uses predefined increments, let's assume she targets the closest, 1 kg/week for this calculation, understanding it might be faster initially). She can realistically commit to walking 45 minutes daily at a moderate pace of 5 km/h. She typically takes about 1300 steps per kilometer.

  • Inputs:
    • Current Weight: 75 kg
    • Target Weight: 70 kg
    • Desired Weight Loss Per Week: 1 kg
    • Walking Speed: 5 km/h
    • Daily Walking Time: 45 minutes
    • Average Steps Per Km: 1300 steps/km
  • Calculator Outputs (estimated):
    • Total Weight to Lose: 5 kg
    • Total Calorie Deficit Required: 38,500 kcal
    • Weekly Calorie Deficit: 7,700 kcal
    • Daily Calorie Deficit Target: 1,100 kcal
    • Distance Walked: (45/60) * 5 = 3.75 km
    • Steps from Planned Walk: 3.75 km * 1300 steps/km = 4875 steps
    • Estimated Daily Walking Burn: 4875 steps * 0.045 kcal/step ≈ 219 kcal
    • Additional Steps Needed: (1100 – 219) / 0.045 ≈ 19,578 steps
    • Primary Result: Total Daily Steps Needed: 4875 + 19578 = 24,453 steps
  • Interpretation: To lose 1 kg per week, Sarah needs a daily deficit of 1100 kcal. Her 45-minute walk burns about 219 kcal (4875 steps). She needs to create an additional deficit of 881 kcal through other means (primarily diet) or by taking roughly 19,578 more steps throughout the day. Her total daily step goal to achieve this deficit via walking and diet adjustment is approximately 24,453 steps. This highlights that while walking is beneficial, achieving a 1kg/week loss often requires significant dietary changes as well.

Example 2: Mark – Maintaining Weight While Increasing Fitness

Mark weighs 85 kg and is happy with his current weight but wants to increase his overall fitness and burn more calories daily. He walks 30 minutes daily at a brisk pace of 6 km/h and averages 1400 steps per kilometer.

  • Inputs:
    • Current Weight: 85 kg
    • Target Weight: 85 kg (Weight loss goal = 0 kg)
    • Desired Weight Loss Per Week: 0 kg (So, daily deficit target is 0, but we can analyze burn)
    • Walking Speed: 6 km/h
    • Daily Walking Time: 30 minutes
    • Average Steps Per Km: 1400 steps/km
  • Calculator Outputs (estimated):
    • Total Weight to Lose: 0 kg
    • Total Calorie Deficit Required: 0 kcal
    • Weekly Calorie Deficit: 0 kcal
    • Daily Calorie Deficit Target: 0 kcal
    • Distance Walked: (30/60) * 6 = 3 km
    • Steps from Planned Walk: 3 km * 1400 steps/km = 4200 steps
    • Estimated Daily Walking Burn: 4200 steps * 0.045 kcal/step ≈ 189 kcal
    • Additional Steps Needed: (0 – 189) / 0.045 = -4200 steps (This implies you don't need *additional* steps to create a deficit; the planned walk already contributes to expenditure)
    • Primary Result: Total Daily Steps Needed: 4200 steps (This represents steps from the planned walk; additional steps would be purely for fitness/health benefits beyond weight loss)
  • Interpretation: Since Mark's weight loss goal is 0 kg, the calculator shows he doesn't need to create a calorie deficit for weight loss. His planned 30-minute brisk walk generates approximately 4200 steps and burns about 189 kcal. If he wants to increase his overall daily step count for general health benefits, he could aim for more steps beyond these 4200. This example shows the calculator's flexibility; setting the target weight equal to current weight effectively turns it into a "steps for calorie burn" calculator.

How to Use This Steps to Walk to Lose Weight Calculator

Using the Steps to Walk to Lose Weight Calculator is straightforward and designed for quick, accurate results. Follow these steps:

Step-by-Step Instructions:

  1. Enter Your Current Weight: Input your weight in kilograms (kg) into the "Your Current Weight" field.
  2. Specify Your Target Weight: Enter your desired weight in kilograms (kg) into the "Target Weight" field.
  3. Set Your Weight Loss Goal: Choose your desired weekly weight loss rate (e.g., 0.5 kg, 1 kg, 1.5 kg) from the dropdown menu. A 1 kg per week goal is generally considered safe and sustainable.
  4. Input Your Walking Details:
    • Walking Speed: Select your average walking pace (Slow, Moderate, Brisk) from the dropdown.
    • Daily Walking Time: Enter the number of minutes you plan to walk each day.
    • Average Steps Per Km: Input your best estimate for steps taken per kilometer. 1300 is a good starting point if unsure.
  5. Calculate: Click the "Calculate Steps" button.

How to Read Results:

  • Primary Highlighted Result (Estimated Daily Steps Needed): This is the total number of steps you should aim for each day to meet your weight loss goal, considering both your planned walking and the necessary overall calorie deficit.
  • Intermediate Values: These provide a breakdown of the calculation, including the total weight to lose, the total and weekly calorie deficits required, and the estimated calorie burn and steps from your planned walking session.
  • Additional Steps Needed: This value shows how many more steps you need to take beyond your planned walk to achieve the required daily calorie deficit. If this number is positive, it implies you need to increase your activity level (more steps) or decrease calorie intake further. If it's negative or zero, your planned walk already contributes significantly to your deficit goal.
  • Key Assumptions: Always review the assumptions used by the calculator. They clarify the conditions under which the results are valid.

Decision-Making Guidance:

Use the results to set realistic daily targets. If the "Estimated Daily Steps Needed" seems very high (e.g., over 20,000 steps), consider:

  • Adjusting Your Goal: A slower weight loss (e.g., 0.5 kg/week) requires a smaller deficit and fewer steps.
  • Increasing Walking Time/Speed: Can you walk for longer or at a faster pace?
  • Dietary Adjustments: Remember that calorie intake plays a crucial role. Achieving a significant deficit often requires combining exercise with mindful eating. The "Additional Steps Needed" can also be met by reducing calorie intake, which is often more efficient than solely increasing steps.
  • Consistency: The key is consistent daily effort. Break down the target steps throughout the day.

Key Factors That Affect Steps to Walk to Lose Weight Results

Several factors influence the accuracy and effectiveness of the steps to walk for weight loss calculation. Understanding these helps in interpreting the results and making informed adjustments:

  1. Metabolism (Basal Metabolic Rate – BMR): Each individual has a unique metabolic rate, influenced by age, sex, muscle mass, and genetics. A higher BMR means more calories burned at rest, potentially requiring fewer steps for the same deficit. The calculator uses an average, so personal variations exist.
  2. Body Composition: Muscle tissue burns more calories than fat tissue. Someone with a higher muscle mass will burn more calories during walking than someone of the same weight with a higher body fat percentage.
  3. Walking Intensity and Terrain: The calculator uses average speed, but variations in pace, inclines, and uneven terrain significantly impact calorie burn. Walking uphill burns considerably more calories than walking on a flat surface.
  4. Environmental Factors: Temperature, wind resistance, and even altitude can affect the energy expenditure during a walk. Walking in extreme heat or cold, or against a strong wind, requires more effort.
  5. Dietary Habits: This is arguably the most significant factor. The calculator assumes a consistent calorie intake. If calorie consumption increases while step count remains the same, weight loss will not occur, regardless of the steps taken. Conversely, reducing calorie intake complements the calorie burn from walking.
  6. Other Physical Activities: The calculator focuses solely on walking. If you engage in other exercises (strength training, sports, etc.), these contribute to your overall daily calorie expenditure, potentially reducing the number of walking steps needed or accelerating weight loss.
  7. Non-Exercise Activity Thermogenesis (NEAT): This includes all calorie expenditure outside of formal exercise, such as fidgeting, standing, and performing daily chores. Higher NEAT contributes to overall calorie burn.

Frequently Asked Questions (FAQ)

Q1: Is 10,000 steps a day enough for weight loss?
10,000 steps is a popular general fitness goal, but whether it's enough for weight loss depends on your individual calorie deficit. If 10,000 steps combined with your diet creates a sufficient deficit, then yes. However, this calculator helps determine the *specific* number of steps needed for *your* weight loss goal, which might be more or less than 10,000.
Q2: How quickly can I expect to lose weight by walking this many steps?
The calculator is based on achieving a specific weekly calorie deficit (e.g., 1 kg per week ≈ 7700 kcal deficit). Weight loss rates can vary. Factors like metabolic rate, adherence to the plan, and dietary consistency play a significant role. The calculator provides an estimate based on ideal conditions.
Q3: What if I can't walk the calculated number of steps daily?
If the target steps seem unachievable, focus on consistency with what you *can* do. You can compensate for fewer steps by reducing your calorie intake further. Alternatively, adjust your weight loss goal to a more manageable rate. Small, consistent efforts yield results over time.
Q4: Does walking speed really matter that much?
Yes, walking speed significantly impacts calorie burn. A brisk walk burns more calories per minute than a leisurely stroll. While the calculator uses average speed, incorporating some faster-paced intervals or brisk walks into your routine can help you reach your calorie deficit goals more efficiently.
Q5: Should I include my steps from other daily activities?
Yes, the "Total Daily Steps Needed" result is your overall goal. This includes steps from planned walks, commuting, chores, fidgeting (NEAT), etc. If you already achieve, say, 6,000 steps daily through non-walking activities, you only need to add the remaining required steps through dedicated walks.
Q6: How accurate is the 'calories burned per step' estimate?
The estimate (around 0.045 kcal per step) is a generalized average. Actual calorie burn varies based on individual factors like weight, gait, terrain, and intensity. It serves as a useful approximation for planning purposes within the context of this calculator.
Q7: Can I use this calculator to maintain my weight?
Yes. Set your "Target Weight" to be the same as your "Current Weight". The calculator will then show the steps needed to offset your estimated daily calorie burn from walking, helping you maintain your current weight by balancing expenditure with intake.
Q8: What about the impact of diet on weight loss?
Diet is paramount. While this calculator focuses on the exercise (walking) component, achieving a significant calorie deficit for weight loss typically requires a combination of increased physical activity and reduced calorie intake. For a 1 kg/week loss, roughly half the deficit often comes from diet and half from exercise, although this ratio can be adjusted based on personal preference and capability.
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// Global variables for chart data var chartDataLabels = []; var chartDataSteps = []; var chartDataBurn = []; var myChart = null; // Function to validate input function validateInput(id, min, max, errorMessageId, message) { var input = document.getElementById(id); var value = parseFloat(input.value); var errorElement = document.getElementById(errorMessageId); var isValid = true; errorElement.style.display = 'none'; // Hide error initially if (isNaN(value) || input.value.trim() === "") { errorElement.textContent = "This field is required."; errorElement.style.display = 'block'; isValid = false; } else if (value max) { errorElement.textContent = "Value cannot be greater than " + max + "."; errorElement.style.display = 'block'; isValid = false; } return isValid; } // Function to calculate steps function calculateSteps() { // Reset errors document.getElementById('weightError').style.display = 'none'; document.getElementById('targetWeightError').style.display = 'none'; document.getElementById('walkingDurationError').style.display = 'none'; document.getElementById('avgStepsPerKmError').style.display = 'none'; // Validate inputs var isWeightValid = validateInput('weight', 1, 200, 'weightError', 'Please enter a valid weight.'); var isTargetWeightValid = validateInput('targetWeight', 1, 200, 'targetWeightError', 'Please enter a valid target weight.'); var isDurationValid = validateInput('walkingDuration', 1, 180, 'walkingDurationError', 'Please enter a valid duration (1-180 minutes).'); var isStepsPerKmValid = validateInput('avgStepsPerKm', 500, 2000, 'avgStepsPerKmError', 'Please enter a valid step count per km (500-2000).'); if (!isWeightValid || !isTargetWeightValid || !isDurationValid || !isStepsPerKmValid) { return; // Stop calculation if any validation fails } var weight = parseFloat(document.getElementById('weight').value); var targetWeight = parseFloat(document.getElementById('targetWeight').value); var weightLossGoalPerWeek = parseFloat(document.getElementById('weightLossGoalPerWeek').value); var walkingSpeed = parseFloat(document.getElementById('walkingSpeed').value); var walkingDuration = parseFloat(document.getElementById('walkingDuration').value); var avgStepsPerKm = parseFloat(document.getElementById('avgStepsPerKm').value); var KILOGRAMS_TO_FAT_KCAL = 7700; // kcal per kg of fat var KCAL_PER_STEP = 0.045; // Approximate kcal burned per step // Calculations var totalWeightToLose = weight – targetWeight; var totalCalorieDeficitRequired = totalWeightToLose * KILOGRAMS_TO_FAT_KCAL; var weeklyCalorieDeficit = weightLossGoalPerWeek * KILOGRAMS_TO_FAT_KCAL; var dailyCalorieDeficitTarget = weeklyCalorieDeficit / 7; var distanceWalkedKm = (walkingDuration / 60) * walkingSpeed; var stepsFromPlannedWalk = distanceWalkedKm * avgStepsPerKm; var estimatedDailyWalkingBurn = stepsFromPlannedWalk * KCAL_PER_STEP; // Handle cases where target weight is >= current weight var additionalStepsNeeded = 0; var primaryResultSteps = stepsFromPlannedWalk; // Default to steps from planned walk var displayDailyDeficitTarget = dailyCalorieDeficitTarget; if (totalWeightToLose > 0) { additionalStepsNeeded = (dailyCalorieDeficitTarget – estimatedDailyWalkingBurn) / KCAL_PER_STEP; // Ensure additional steps are not negative, meaning planned walk already covers deficit if (additionalStepsNeeded < 0) { additionalStepsNeeded = 0; } primaryResultSteps = stepsFromPlannedWalk + additionalStepsNeeded; } else { // If not aiming to lose weight, the goal is just to burn calories via walking primaryResultSteps = stepsFromPlannedWalk; displayDailyDeficitTarget = 0; // No deficit needed for weight loss additionalStepsNeeded = 0; // No *additional* steps needed for deficit } // Update results display document.getElementById('results').style.display = 'block'; document.getElementById('totalWeightToLose').textContent = totalWeightToLose.toFixed(1); document.getElementById('totalCalorieDeficit').textContent = totalCalorieDeficitRequired.toFixed(0); document.getElementById('weeklyCalorieDeficit').textContent = weeklyCalorieDeficit.toFixed(0); document.getElementById('dailyWalkingBurn').textContent = estimatedDailyWalkingBurn.toFixed(0); document.getElementById('dailyWalkingSteps').textContent = stepsFromPlannedWalk.toFixed(0); document.getElementById('additionalStepsNeeded').textContent = additionalStepsNeeded.toFixed(0); document.getElementById('primaryResultSteps').textContent = primaryResultSteps.toFixed(0); // Update Table Data updateProgressTable(primaryResultSteps, stepsFromPlannedWalk, additionalStepsNeeded, totalWeightToLose, weightLossGoalPerWeek, KILOGRAMS_TO_FAT_KCAL); // Update Chart Data updateChartData(primaryResultSteps, stepsFromPlannedWalk, estimatedDailyWalkingBurn); renderChart(); } // Function to update the progress table function updateProgressTable(targetDailySteps, walkSteps, additionalSteps, totalWeight, weeklyGoal, kcalPerKg) { var tableBody = document.getElementById('progressTableBody'); tableBody.innerHTML = ''; // Clear previous rows var currentWeight = parseFloat(document.getElementById('weight').value); var weightLossGoalPerWeek = parseFloat(document.getElementById('weightLossGoalPerWeek').value); var avgStepsPerKm = parseFloat(document.getElementById('avgStepsPerKm').value); var walkingSpeed = parseFloat(document.getElementById('walkingSpeed').value); var walkingDuration = parseFloat(document.getElementById('walkingDuration').value); var KILOGRAMS_TO_FAT_KCAL = 7700; var KCAL_PER_STEP = 0.045; var currentWeightForTable = currentWeight; for (var i = 1; i <= 10; i++) { // Show progress for 10 weeks var row = tableBody.insertRow(); var weekCell = row.insertCell(0); var targetStepsCell = row.insertCell(1); var walkStepsCell = row.insertCell(2); var remainingStepsCell = row.insertCell(3); var weightLostCell = row.insertCell(4); weekCell.textContent = i; targetStepsCell.textContent = targetDailySteps.toFixed(0); walkStepsCell.textContent = walkSteps.toFixed(0); remainingStepsCell.textContent = additionalSteps.toFixed(0); var estimatedWeightLostThisWeek = weeklyGoal; weightLostCell.textContent = estimatedWeightLostThisWeek.toFixed(1); currentWeightForTable -= estimatedWeightLostThisWeek; if (currentWeightForTable < parseFloat(document.getElementById('targetWeight').value)) { currentWeightForTable = parseFloat(document.getElementById('targetWeight').value); // Cap at target weight } } } // Function to update chart data and prepare for rendering function updateChartData(primarySteps, walkSteps, walkBurn) { chartDataLabels = []; chartDataSteps = []; chartDataBurn = []; var currentSteps = 0; var currentWeight = parseFloat(document.getElementById('weight').value); var targetWeight = parseFloat(document.getElementById('targetWeight').value); var totalWeightToLose = currentWeight – targetWeight; var weightLossPerWeek = parseFloat(document.getElementById('weightLossGoalPerWeek').value); var kcalPerKg = 7700; // If not losing weight, just show the burn from the planned walk over time if (totalWeightToLose <= 0) { var dailyBurn = walkBurn; var dailySteps = walkSteps; for (var i = 0; i < 7; i++) { // Show for a week chartDataLabels.push("Day " + (i + 1)); chartDataSteps.push(dailySteps); chartDataBurn.push(dailyBurn); } } else { // Calculate steps needed to reach target weight var deficitNeeded = totalWeightToLose * kcalPerKg; var totalStepsToLose = deficitNeeded / 0.045; // Approx steps for total deficit // Distribute steps over the estimated time to lose the weight var weeksToLose = totalWeightToLose / weightLossPerWeek; var totalDays = weeksToLose * 7; var stepsPerDayTarget = primarySteps; // The calculated goal steps var burnPerDayPlannedWalk = walkBurn; // Burn from planned walk for (var i = 0; i < totalDays && i < 30; i++) { // Limit to 30 days for clarity chartDataLabels.push("Day " + (i + 1)); chartDataSteps.push(stepsPerDayTarget); chartDataBurn.push(burnPerDayPlannedWalk); // Show burn from planned walk for comparison } } } // Function to render the chart using Canvas API function renderChart() { var ctx = document.getElementById('calorieBurnChart').getContext('2d'); // Destroy previous chart instance if it exists if (myChart) { myChart.destroy(); } myChart = new Chart(ctx, { type: 'bar', // Use bar chart for better visual comparison data: { labels: chartDataLabels, datasets: [{ label: 'Estimated Calorie Burn (Planned Walk) (kcal)', data: chartDataBurn, backgroundColor: '#004a99', // Primary color borderColor: '#003a7a', borderWidth: 1 }, { label: 'Target Daily Steps', data: chartDataSteps, backgroundColor: '#28a745', // Success color borderColor: '#1e7e34', borderWidth: 1, type: 'line', // Use line for steps for distinction fill: false, yAxisID: 'y-axis-steps' // Assign to the secondary y-axis }] }, options: { responsive: true, maintainAspectRatio: false, scales: { x: { title: { display: true, text: 'Days' } }, y: { title: { display: true, text: 'Calories (kcal)' }, beginAtZero: true, ticks: { // Include a dollar sign in the ticks callback: function(value, index, values) { return value + ' kcal'; } } }, y-axis-steps: { // Configuration for the secondary y-axis type: 'linear', position: 'right', title: { display: true, text: 'Steps' }, beginAtZero: true, ticks: { callback: function(value, index, values) { return value.toLocaleString() + ' steps'; } }, grid: { drawOnChartArea: false, // Only want the grid lines for the primary y-axis } } }, plugins: { tooltip: { mode: 'index', intersect: false, callbacks: { label: function(context) { var label = context.dataset.label || ''; if (label) { label += ': '; } if (context.dataset.yAxisID === 'y-axis-steps') { label += context.parsed.y.toLocaleString() + ' steps'; } else { label += context.parsed.y.toFixed(0) + ' kcal'; } return label; } } } } } }); } // Function to reset calculator to default values function resetCalculator() { document.getElementById('weight').value = "75"; document.getElementById('targetWeight').value = "70"; document.getElementById('weightLossGoalPerWeek').value = "1"; document.getElementById('walkingSpeed').value = "5"; document.getElementById('walkingDuration').value = "45"; document.getElementById('avgStepsPerKm').value = "1300"; // Clear errors document.getElementById('weightError').textContent = ""; document.getElementById('weightError').style.display = 'none'; document.getElementById('targetWeightError').textContent = ""; document.getElementById('targetWeightError').style.display = 'none'; document.getElementById('walkingDurationError').textContent = ""; document.getElementById('walkingDurationError').style.display = 'none'; document.getElementById('avgStepsPerKmError').textContent = ""; document.getElementById('avgStepsPerKmError').style.display = 'none'; // Reset results display document.getElementById('results').style.display = 'none'; document.getElementById('totalWeightToLose').textContent = "–"; document.getElementById('totalCalorieDeficit').textContent = "–"; document.getElementById('weeklyCalorieDeficit').textContent = "–"; document.getElementById('dailyWalkingBurn').textContent = "–"; document.getElementById('dailyWalkingSteps').textContent = "–"; document.getElementById('additionalStepsNeeded').textContent = "–"; document.getElementById('primaryResultSteps').textContent = "–"; // Clear chart data chartDataLabels = []; chartDataSteps = []; chartDataBurn = []; if (myChart) { myChart.destroy(); myChart = null; } document.getElementById('progressTableBody').innerHTML = ''; } // Function to copy results to clipboard function copyResults() { var resultsDiv = document.getElementById('results'); if (resultsDiv.style.display === 'none') { alert('No results to copy yet. Please calculate first.'); return; } var primaryResult = document.getElementById('primaryResultSteps').textContent; var totalWeight = document.getElementById('totalWeightToLose').textContent; var totalDeficit = document.getElementById('totalCalorieDeficit').textContent; var weeklyDeficit = document.getElementById('weeklyCalorieDeficit').textContent; var dailyWalkingBurn = document.getElementById('dailyWalkingBurn').textContent; var dailyWalkingSteps = document.getElementById('dailyWalkingSteps').textContent; var additionalSteps = document.getElementById('additionalStepsNeeded').textContent; var assumptions = [ "1 kg of fat is approximately 7700 kcal.", "Walking speed and duration remain constant.", "Average steps per kilometer is fixed.", "Dietary intake remains consistent.", "No other physical activity is factored in." ].join('\n'); var textToCopy = "— Weight Loss Walking Plan Results —\n\n" + "Estimated Daily Steps Needed: " + primaryResult + " steps\n" + "Total Weight to Lose: " + totalWeight + " kg\n" + "Total Calorie Deficit Required: " + totalDeficit + " kcal\n" + "Calorie Deficit Per Week: " + weeklyDeficit + " kcal\n" + "Estimated Daily Calorie Burn from Walking: " + dailyWalkingBurn + " kcal\n" + "Estimated Daily Steps from Walking: " + dailyWalkingSteps + " steps\n" + "Additional Steps Needed: " + additionalSteps + " steps\n\n" + "Key Assumptions:\n" + assumptions; navigator.clipboard.writeText(textToCopy).then(function() { alert('Results copied to clipboard!'); }).catch(function(err) { console.error('Failed to copy: ', err); alert('Failed to copy results. Please try again.'); }); } // Initialize chart on page load if there are default values document.addEventListener('DOMContentLoaded', function() { // Set default values and trigger calculation on load resetCalculator(); // Sets defaults calculateSteps(); // Calculate based on defaults // Ensure chart canvas element exists before trying to render var canvas = document.getElementById('calorieBurnChart'); if (canvas) { // Add Chart.js library dynamically if not present if (typeof Chart === 'undefined') { var script = document.createElement('script'); script.src = 'https://cdn.jsdelivr.net/npm/chart.js@3.9.1/dist/chart.min.js'; script.onload = function() { renderChart(); // Render chart after library is loaded }; document.head.appendChild(script); } else { renderChart(); // Render if Chart.js is already loaded } } else { console.error("Canvas element 'calorieBurnChart' not found."); } });

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