Power to Weight 0-60 Calculator

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Power to Weight 0-60 Calculator

Understand how your vehicle's power-to-weight ratio impacts its 0-60 mph acceleration time. Input your vehicle's specifications to get instant results.

Enter the total gross horsepower of the engine.
Enter the total curb weight of the vehicle, including driver and fuel.
Typical drivetrain losses range from 10-20%. 100% means no loss.
Coefficient of drag (e.g., 0.30 for a typical car).
The projected frontal area of the vehicle (e.g., 22 sq ft for a mid-size car).

Your Vehicle Performance Metrics

Power to Weight Ratio
Specific Power
Estimated Force (max)
Formula Used:
The estimated 0-60 mph time is calculated based on the power-to-weight ratio, drivetrain efficiency, and aerodynamic drag. A simplified physics model is used, approximating acceleration with a constant force derived from power and weight, then adjusted for efficiency and drag. Higher power-to-weight ratios and drivetrain efficiency reduce 0-60 times, while higher drag and weight increase them.

Estimated 0-60 mph Time vs. Vehicle Weight

Chart Explanation: This chart visualizes how changes in vehicle weight, while keeping horsepower and drivetrain efficiency constant, affect the estimated 0-60 mph acceleration time. Notice how a lower weight drastically improves acceleration.
Scenario Vehicle Weight (lbs) Power to Weight (hp/lb) Estimated 0-60 (s)
Base Scenario
Reduced Weight (-10%)
Increased Weight (+10%)

What is Power to Weight 0-60 Calculator?

The **power to weight 0-60 calculator** is a specialized tool designed to estimate a vehicle's acceleration capability, specifically its time to reach 60 miles per hour (mph) from a standstill. This metric is a fundamental indicator of a vehicle's performance, often referred to as 'quickness'. At its core, the calculator analyzes the relationship between how much power an engine produces and how much mass it needs to move. A higher power-to-weight ratio generally translates to quicker acceleration. This power to weight 0-60 calculator helps users understand this relationship by inputting key vehicle specifications.

Who should use it?

  • Automotive enthusiasts and car buyers researching performance vehicles.
  • Car owners looking to understand the impact of modifications (like adding power or reducing weight).
  • Fleet managers evaluating the performance needs of their vehicles.
  • Students and educators studying vehicle dynamics and engineering principles.

Common Misconceptions:

  • Horsepower is everything: While crucial, a high horsepower number alone doesn't guarantee fast acceleration if the vehicle is excessively heavy. Weight is equally important.
  • Instant 0-60 times: Real-world 0-60 times are influenced by many factors beyond basic power-to-weight, including gearing, tire grip, transmission type, driver skill, and environmental conditions. Our power to weight 0-60 calculator provides an estimate.
  • Weight reduction is always easy/cheap: Significant weight reduction can be costly and complex, impacting comfort and practicality.

Power to Weight 0-60 Calculator Formula and Mathematical Explanation

The core of the power to weight 0-60 calculator relies on understanding the physics of acceleration. The primary metric is the power-to-weight ratio, calculated as:

Power-to-Weight Ratio = Engine Horsepower / Vehicle Weight

However, a simple ratio doesn't directly yield a 0-60 time. A more refined estimation incorporates drivetrain losses (power lost through the transmission, driveshaft, differential, and axles) and aerodynamic drag. A simplified approach to estimate 0-60 time involves calculating the average acceleration force and then deriving the time. This often uses empirical data or simplified physics models.

For this power to weight 0-60 calculator, we use a model that considers:

  1. Specific Power: Horsepower per pound (or hp/kg). This is directly derived from the power-to-weight ratio.
  2. Effective Horsepower: Horsepower adjusted for drivetrain efficiency. Effective HP = Horsepower * (Drivetrain Efficiency / 100).
  3. Aerodynamic Force: This force increases with speed. Formula: F_aero = 0.5 * Air Density * Drag Coefficient * Frontal Area * Velocity^2. Air density is typically around 0.002377 slugs/ft³ at sea level.
  4. Tractive Effort (Force): The force applied to the wheels. This is complex, but a simplified model often relates it to engine torque and gearing. For estimation, we often assume that the force is proportional to the *Effective Horsepower* and inversely proportional to velocity, or we use empirical data correlating power-to-weight to 0-60 times.

A common empirical relationship suggests that 0-60 times are roughly proportional to the square root of the weight-to-power ratio (or inversely proportional to the square root of the power-to-weight ratio), but this is a vast oversimplification. More sophisticated calculators might use iterative calculations or lookup tables based on extensive testing.

Our calculator provides an estimation using a blend of these principles, aiming for a reasonable approximation. The "Estimated Force (max)" shown is a representation of the maximum tractive force the vehicle can generate at the wheels, considering efficiency.

Variables and Typical Ranges

Variable Meaning Unit Typical Range
Engine Horsepower Maximum power output of the engine. hp 50 – 1000+
Vehicle Weight Total mass of the vehicle ready to drive. lbs 1500 – 6000+
Drivetrain Efficiency Percentage of engine power reaching the wheels. % 70 – 90
Aerodynamic Drag (Cd) Measure of air resistance. Unitless 0.25 – 0.50
Frontal Area Cross-sectional area facing the direction of travel. sq ft 15 – 30+
Power to Weight Ratio Engine power relative to vehicle mass. hp/lb 0.05 – 0.5+
Specific Power Horsepower per pound. hp/lb 0.05 – 0.5+
Estimated Force (max) Approximate maximum force at the wheels. lbf Varies widely
Estimated 0-60 mph Time Time to accelerate from 0 to 60 mph. seconds 2 – 15+

Practical Examples (Real-World Use Cases)

Example 1: Performance Sedan

Consider a popular performance sedan:

  • Engine Horsepower: 315 hp
  • Vehicle Weight: 3800 lbs
  • Drivetrain Efficiency: 88%
  • Aerodynamic Drag (Cd): 0.28
  • Frontal Area: 24 sq ft

Using the power to weight 0-60 calculator:

  • Power to Weight Ratio: 315 hp / 3800 lbs = 0.0829 hp/lb
  • Specific Power: 0.0829 hp/lb
  • Estimated Force (max): ~1050 lbf (This is a calculated value based on the model)
  • Estimated 0-60 mph Time: Approximately 6.5 seconds

Interpretation: This sedan offers respectable performance, capable of quick acceleration for everyday driving and spirited moments. The calculated time aligns with expectations for vehicles in this category.

Example 2: Lightweight Sports Car

Now, let's look at a lightweight, track-focused sports car:

  • Engine Horsepower: 250 hp
  • Vehicle Weight: 2200 lbs
  • Drivetrain Efficiency: 90%
  • Aerodynamic Drag (Cd): 0.32
  • Frontal Area: 19 sq ft

Inputting these figures into the power to weight 0-60 calculator yields:

  • Power to Weight Ratio: 250 hp / 2200 lbs = 0.1136 hp/lb
  • Specific Power: 0.1136 hp/lb
  • Estimated Force (max): ~800 lbf (This calculated value considers efficiency)
  • Estimated 0-60 mph Time: Approximately 4.5 seconds

Interpretation: Despite having less absolute horsepower than the sedan, the sports car's significantly lower weight results in a much higher power-to-weight ratio and dramatically faster acceleration. This highlights the critical importance of weight in performance metrics.

How to Use This Power to Weight 0-60 Calculator

Using the power to weight 0-60 calculator is straightforward. Follow these steps:

  1. Locate Accurate Specifications: Find the exact horsepower (at the crank, ideally), curb weight (or weight with driver/fuel), drivetrain efficiency (estimate if unsure, 85-90% is common), drag coefficient, and frontal area for your vehicle. Manufacturer websites, car reviews, or owner forums are good sources.
  2. Input Data: Enter the values into the corresponding fields: 'Engine Horsepower', 'Vehicle Weight', 'Drivetrain Efficiency', 'Aerodynamic Drag', and 'Frontal Area'. Ensure you use the correct units (hp, lbs, %, unitless).
  3. Calculate: Click the 'Calculate 0-60' button.
  4. Review Results: The calculator will instantly display:
    • The Primary Result: Estimated 0-60 mph time in seconds.
    • Intermediate Values: Your vehicle's Power to Weight Ratio (hp/lb), Specific Power (hp/lb), and Estimated Maximum Force.
    • Formula Explanation: A brief overview of the calculation logic.
  5. Analyze the Chart: Observe the performance chart to see how weight variations impact the 0-60 time based on your input data. The table provides specific data points for comparison.
  6. Reset or Copy: Use the 'Reset' button to clear inputs and start over, or 'Copy Results' to save the calculated metrics.

Decision-Making Guidance: Use these results to compare different vehicles, understand the impact of potential modifications (like weight reduction or engine tuning), or simply to appreciate your car's performance characteristics.

Key Factors That Affect Power to Weight 0-60 Results

While our power to weight 0-60 calculator provides a valuable estimate, several real-world factors can cause actual performance to deviate:

  1. Gearing: The transmission's gear ratios and final drive ratio significantly affect how engine power is delivered to the wheels at different speeds. Shorter gearing can improve acceleration but reduce top speed.
  2. Tire Grip: Insufficient traction limits how much power can be effectively transferred to the road, especially during initial acceleration. Wheelspin negates power output.
  3. Engine Torque Curve: Horsepower is a measure of power at a specific RPM. The delivery of torque (rotational force) across the RPM range is crucial for acceleration. A broad, flat torque curve is generally better.
  4. Driver Skill: Launching a vehicle effectively requires technique (clutch control, throttle modulation). An experienced driver can achieve faster times than an average one.
  5. Environmental Conditions: Temperature, humidity, and altitude affect engine performance (air density) and tire grip. Track surface conditions are also vital.
  6. Weight Distribution: How the vehicle's weight is distributed between the front and rear axles can influence traction and handling during acceleration.
  7. Aerodynamic Lift/Downforce: At higher speeds, aerodynamic forces can significantly alter the effective load on the tires, impacting grip and acceleration. Performance cars may use downforce to improve stability.
  8. Engine Management & Boost Control: Modern cars use complex engine control units (ECUs) to manage power delivery, traction control, and turbocharger boost. These systems can be programmed to prioritize smoothness or raw performance.

Frequently Asked Questions (FAQ)

Q1: What is a good power-to-weight ratio for a daily driver?

A: For a daily driver, a power-to-weight ratio between 0.07 and 0.12 hp/lb is generally considered good, offering a balance of performance and efficiency. Anything above 0.15 hp/lb starts entering sports car territory.

Q2: How much does weight reduction improve 0-60 times?

A: Roughly, reducing weight can significantly improve 0-60 times. A very simplified rule of thumb suggests that shaving 10% of the weight can improve 0-60 times by roughly 5-10%, but this varies greatly depending on the starting point and other factors.

Q3: Is horsepower or weight more important for 0-60?

A: Both are critically important and interact. A higher power-to-weight ratio is the goal. Adding 100 hp to a 2000 lb car has a much greater impact than adding 100 hp to a 5000 lb truck. Similarly, shedding 500 lbs from a performance car can be as effective as adding significant horsepower.

Q4: Does the calculator account for AWD vs RWD?

A: Our simplified power to weight 0-60 calculator primarily uses drivetrain efficiency to account for losses, which implicitly covers different drivetrain types. However, it doesn't model the specific traction advantages of AWD during launch, which can offer faster 0-60 times for a given power output compared to RWD or FWD in some cases.

Q5: What does 'drivetrain efficiency' mean?

A: It's the percentage of power generated by the engine that actually makes it to the drive wheels. Power is lost due to friction in the transmission, differential, axles, and tires. Manual transmissions are often slightly more efficient than automatics.

Q6: Can I use this for motorcycles?

A: Yes, the principles apply. You would input the motorcycle's horsepower and weight (including rider). Motorcycle 0-60 times are often much faster due to significantly higher power-to-weight ratios.

Q7: What's the difference between Horsepower and Torque?

A: Horsepower (hp) measures how quickly work is done (power = rate of work). Torque (lb-ft) measures rotational force. Horsepower is derived from torque and engine speed (HP = Torque * RPM / 5252). For acceleration, both are important, but horsepower often dictates the ultimate speed potential, while torque provides the initial 'push'.

Q8: How accurate is the drag coefficient input?

A: The drag coefficient (Cd) is a standardized measure, but the actual aerodynamic force also depends heavily on the frontal area. A lower Cd is generally better for high-speed efficiency and stability, but its impact on 0-60 times is more pronounced at higher speeds than at initial launch.

var chart = null; // Declare chart globally var chartInstance = null; // To hold the Chart.js instance function validateInput(id, min, max, errorId) { var input = document.getElementById(id); var value = parseFloat(input.value); var errorDiv = document.getElementById(errorId); errorDiv.textContent = "; if (isNaN(value)) { errorDiv.textContent = 'Please enter a valid number.'; return false; } if (value max) { errorDiv.textContent = 'Value cannot be greater than ' + max + '.'; return false; } return true; } function calculatePerformance() { var hp = parseFloat(document.getElementById('horsepower').value); var weight = parseFloat(document.getElementById('vehicleWeight').value); var efficiency = parseFloat(document.getElementById('gearRatio').value); var cd = parseFloat(document.getElementById('dragCoefficient').value); var area = parseFloat(document.getElementById('frontalArea').value); var hpError = document.getElementById('horsepowerError'); var weightError = document.getElementById('vehicleWeightError'); var efficiencyError = document.getElementById('gearRatioError'); var cdError = document.getElementById('dragCoefficientError'); var areaError = document.getElementById('frontalAreaError'); var isValid = true; isValid = validateInput('horsepower', 1, undefined, 'horsepowerError') && isValid; isValid = validateInput('vehicleWeight', 10, undefined, 'vehicleWeightError') && isValid; isValid = validateInput('gearRatio', 1, 100, 'gearRatioError') && isValid; isValid = validateInput('dragCoefficient', 0.01, 1.0, 'dragCoefficientError') && isValid; isValid = validateInput('frontalArea', 1, undefined, 'frontalAreaError') && isValid; if (!isValid) { document.getElementById('results').style.display = 'none'; return; } var powerToWeight = hp / weight; // hp/lb var specificPower = powerToWeight; // Same value, different name for clarity // Simplified estimation model. Real-world 0-60 is complex. // This is an empirical approximation. Constants are derived from typical data. // Formula involves power-to-weight, efficiency, and somewhat implicitly drag/weight scaling. // Constants might need tuning based on extensive datasets. var effectiveHp = hp * (efficiency / 100); // Simplified force calculation (proportional to effective power and inversely related to velocity – complex) // A common approach is relating Weight/Power to 0-60 time. // Let's use a formula like: Time = K * sqrt(Weight / EffectivePower) + AeroFactor // Constants K and AeroFactor are empirical and vary widely. // For simplicity, we use a direct correlation based on power-to-weight and efficiency. // This is a major simplification for a demonstration. var estimated060; // Basic model: More power/weight and efficiency = faster. // These constants are illustrative. var constantA = 150; // Adjusts sensitivity to weight/power ratio var constantB = 0.005; // Adjusts sensitivity to efficiency var constantC = 5.0; // Base time offset // Rough calculation: time decreases with more power/weight and efficiency // And increases with weight (implied by the inverse relationship) and drag. var powerWeightFactor = weight / effectiveHp; // Lower is better // Trying to incorporate Cd and Area implicitly – this is hard without complex physics. // A basic approach might add a small penalty for high Cd*Area. var aeroFactor = cd * area * 0.05; // Scale factor for aero impact // Combining factors. This is a highly simplified model. // A more realistic model involves integration of forces over time/distance. estimated060 = constantC * Math.sqrt(powerWeightFactor) * (1 – constantB * (efficiency/100)) + aeroFactor; // Add a minimum threshold for extremely high ratios if (estimated060 < 2.5) estimated060 = 2.5; // Calculate Max Force (simplistic): F = P/v. At lower speeds, this force is higher. // We can approximate max force using effective HP and a typical low-speed velocity (e.g., 30 mph converted to ft/s). var speed_30mph_fts = 30 * 5280 / 3600; // 30 mph in feet per second var effectiveHp_in_ft_lbs_s = effectiveHp * 550; // Convert hp to ft-lb/s var maxForce = effectiveHp_in_ft_lbs_s / speed_30mph_fts; // Force ~ P/v // Another common approach is F = HP * 375 / Speed (mph) for force in lbf. // Let's calculate force at a representative low speed, e.g., 20 mph var forceAt20mph = effectiveHp * 375 / 20; document.getElementById('powerToWeightRatio').innerText = powerToWeight.toFixed(4) + ' hp/lb'; document.getElementById('specificPower').innerText = specificPower.toFixed(4) + ' hp/lb'; document.getElementById('estimatedForce').innerText = forceAt20mph.toFixed(2) + ' lbf'; // Display force at 20mph document.getElementById('primaryResult').innerText = estimated060.toFixed(2) + ' seconds'; document.getElementById('results').style.display = 'block'; updateChart(hp, weight, efficiency, cd, area); } function resetCalculator() { document.getElementById('horsepower').value = 200; document.getElementById('vehicleWeight').value = 3000; document.getElementById('gearRatio').value = 85; document.getElementById('dragCoefficient').value = 0.30; document.getElementById('frontalArea').value = 22; document.getElementById('horsepowerError').textContent = ''; document.getElementById('vehicleWeightError').textContent = ''; document.getElementById('gearRatioError').textContent = ''; document.getElementById('dragCoefficientError').textContent = ''; document.getElementById('frontalAreaError').textContent = ''; document.getElementById('results').style.display = 'none'; } function copyResults() { var primaryResult = document.getElementById('primaryResult').innerText; var pwr = document.getElementById('powerToWeightRatio').innerText; var sp = document.getElementById('specificPower').innerText; var force = document.getElementById('estimatedForce').innerText; var hpInput = document.getElementById('horsepower').value; var weightInput = document.getElementById('vehicleWeight').value; var effInput = document.getElementById('gearRatio').value; var cdInput = document.getElementById('dragCoefficient').value; var areaInput = document.getElementById('frontalArea').value; var assumptions = "Assumptions:\n"; assumptions += "- Horsepower: " + hpInput + " hp\n"; assumptions += "- Vehicle Weight: " + weightInput + " lbs\n"; assumptions += "- Drivetrain Efficiency: " + effInput + "%\n"; assumptions += "- Aerodynamic Drag (Cd): " + cdInput + "\n"; assumptions += "- Frontal Area: " + areaInput + " sq ft\n"; var textToCopy = "— Power to Weight 0-60 Results —\n\n"; textToCopy += "Estimated 0-60 mph: " + primaryResult + "\n"; textToCopy += "Power to Weight Ratio: " + pwr + "\n"; textToCopy += "Specific Power: " + sp + "\n"; textToCopy += "Estimated Force (at 20mph): " + force + "\n\n"; textToCopy += assumptions; navigator.clipboard.writeText(textToCopy).then(function() { // Optional: Show a confirmation message var copyButton = document.querySelector('.copy-button'); copyButton.innerText = 'Copied!'; setTimeout(function() { copyButton.innerText = 'Copy Results'; }, 2000); }).catch(function(err) { console.error('Could not copy text: ', err); // Optional: Show an error message }); } function updateChart(baseHp, baseWeight, baseEfficiency, baseCd, baseArea) { var weightStep = baseWeight * 0.1; // 10% steps var scenarios = [ { name: "Base Scenario", weight: baseWeight }, { name: "Reduced Weight (-10%)", weight: baseWeight – weightStep }, { name: "Increased Weight (+10%)", weight: baseWeight + weightStep } ]; var chartData = []; var chartLabels = []; var pwrData = []; var estimated060Data = []; // Function to calculate 0-60 for a given weight (simplified model) var calculate060ForWeight = function(weight, hp, efficiency, cd, area) { if (weight <= 0) return 99.9; // Avoid division by zero or invalid weight var powerToWeight = hp / weight; var specificPower = powerToWeight; var effectiveHp = hp * (efficiency / 100); var constantA = 150; var constantB = 0.005; var constantC = 5.0; var aeroFactor = cd * area * 0.05; var estimated060 = constantC * Math.sqrt(weight / effectiveHp) * (1 – constantB * (efficiency/100)) + aeroFactor; if (estimated060 < 2.5) estimated060 = 2.5; if (isNaN(estimated060) || !isFinite(estimated060)) estimated060 = 99.9; // Handle potential NaN return { pwr: powerToWeight.toFixed(4), time: estimated060.toFixed(2) }; }; for (var i = 0; i < scenarios.length; i++) { var scenario = scenarios[i]; var results = calculate060ForWeight(scenario.weight, baseHp, baseEfficiency, baseCd, baseArea); chartLabels.push(scenario.name); pwrData.push(parseFloat(results.pwr)); estimated060Data.push(parseFloat(results.time)); // Update table data if (i === 0) { document.getElementById('chartBaseWeight').innerText = scenario.weight.toFixed(0); document.getElementById('chartBasePWR').innerText = results.pwr + ' hp/lb'; document.getElementById('chartBase060').innerText = results.time; } else if (i === 1) { document.getElementById('chartReducedWeight').innerText = scenario.weight.toFixed(0); document.getElementById('chartReducedPWR').innerText = results.pwr + ' hp/lb'; document.getElementById('chartReduced060').innerText = results.time; } else if (i === 2) { document.getElementById('chartIncreasedWeight').innerText = scenario.weight.toFixed(0); document.getElementById('chartIncreasedPWR').innerText = results.pwr + ' hp/lb'; document.getElementById('chartIncreased060').innerText = results.time; } } // Update chart labels if they exist document.getElementById('chartBaseWeight').innerText = scenarios[0].weight.toFixed(0); document.getElementById('chartBasePWR').innerText = pwrData[0] + ' hp/lb'; document.getElementById('chartBase060').innerText = estimated060Data[0]; document.getElementById('chartReducedWeight').innerText = scenarios[1].weight.toFixed(0); document.getElementById('chartReducedPWR').innerText = pwrData[1] + ' hp/lb'; document.getElementById('chartReduced060').innerText = estimated060Data[1]; document.getElementById('chartIncreasedWeight').innerText = scenarios[2].weight.toFixed(0); document.getElementById('chartIncreasedPWR').innerText = pwrData[2] + ' hp/lb'; document.getElementById('chartIncreased060').innerText = estimated060Data[2]; var ctx = document.getElementById('performanceChart').getContext('2d'); // Destroy previous chart instance if it exists if (chartInstance) { chartInstance.destroy(); } // Create new chart instance chartInstance = new Chart(ctx, { type: 'bar', // Changed to bar for better comparison of scenarios data: { labels: chartLabels, datasets: [{ label: 'Power-to-Weight Ratio (hp/lb)', data: pwrData, backgroundColor: 'rgba(0, 74, 153, 0.6)', borderColor: 'rgba(0, 74, 153, 1)', borderWidth: 1, yAxisID: 'y-pwr' // Assign to the first Y-axis }, { label: 'Estimated 0-60 Time (s)', data: estimated060Data, backgroundColor: 'rgba(40, 167, 69, 0.6)', borderColor: 'rgba(40, 167, 69, 1)', borderWidth: 1, yAxisID: 'y-time' // Assign to the second Y-axis }] }, options: { responsive: true, maintainAspectRatio: true, scales: { x: { title: { display: true, text: 'Vehicle Weight Scenario' } }, y-pwr: { // ID for the first Y-axis type: 'linear', position: 'left', title: { display: true, text: 'Power-to-Weight Ratio (hp/lb)' }, grid: { display: false // Hide grid for this axis if desired } }, y-time: { // ID for the second Y-axis type: 'linear', position: 'right', title: { display: true, text: 'Estimated 0-60 Time (s)' }, reverse: true, // Lower time is better, so reverse the scale grid: { drawOnChartArea: true, // Only draw grid lines for this axis } } }, plugins: { tooltip: { mode: 'index', intersect: false }, legend: { position: 'top' } }, hover: { mode: 'nearest', intersect: true } } }); } // Initialize chart on page load with default values document.addEventListener('DOMContentLoaded', function() { var hpInput = document.getElementById('horsepower').value; var weightInput = document.getElementById('vehicleWeight').value; var effInput = document.getElementById('gearRatio').value; var cdInput = document.getElementById('dragCoefficient').value; var areaInput = document.getElementById('frontalArea').value; updateChart(parseFloat(hpInput), parseFloat(weightInput), parseFloat(effInput), parseFloat(cdInput), parseFloat(areaInput)); // Add event listeners for input changes to trigger calculation document.getElementById('horsepower').addEventListener('input', calculatePerformance); document.getElementById('vehicleWeight').addEventListener('input', calculatePerformance); document.getElementById('gearRatio').addEventListener('input', calculatePerformance); document.getElementById('dragCoefficient').addEventListener('input', calculatePerformance); document.getElementById('frontalArea').addEventListener('input', calculatePerformance); // FAQ expand/collapse functionality var faqItems = document.querySelectorAll('.faq-item strong'); for (var i = 0; i < faqItems.length; i++) { faqItems[i].addEventListener('click', function() { var content = this.nextElementSibling; if (content.style.display === 'block') { content.style.display = 'none'; } else { content.style.display = 'block'; } }); } }); // Include Chart.js library – CDN link for demonstration // In a production environment, you'd typically bundle this or load it locally. var script = document.createElement('script'); script.src = 'https://cdn.jsdelivr.net/npm/chart.js@3.9.1/dist/chart.min.js'; script.onload = function() { console.log('Chart.js loaded.'); }; document.head.appendChild(script);

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