Tmobile Trade in Calculator

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T-Mobile Trade-In Calculator

Enter the exact model of your current device.
Excellent (No scratches, perfect screen, full battery health) Good (Minor cosmetic wear, functional screen) Fair (Visible scratches, functional screen, some wear) Poor (Cracked screen, significant damage, but powers on) Select the condition that best describes your device.
Enter the storage size of your device in Gigabytes.
Enter the model of the new device you are interested in.
Yes (Maximizes value) No (Standard trade-in value) Are you eligible for a specific T-Mobile trade-in promotion?

Estimated Trade-In Value

Estimated Credit: $0
Base Value: $0
Promotional Boost: $0
Potential Savings on New Device: $0
$0
The estimated trade-in value is based on the device model, condition, storage, and current T-Mobile promotions. A higher condition and storage generally yield more credit. Promotions can significantly increase the offered value.

T-Mobile Trade-In Calculator: Maximize Your Device Value

Thinking about upgrading your smartphone with T-Mobile? A crucial part of the process is understanding the value of your current device. T-Mobile offers trade-in programs that allow you to exchange your old phone for credit towards a new one, significantly reducing the cost of your upgrade. This is where a reliable T-Mobile trade-in calculator becomes an invaluable tool. By using a T-Mobile trade-in calculator, you can get a clear estimate of how much credit you can expect, empowering you to make informed decisions about your next device purchase and maximizing the value you get from your old technology.

What is a T-Mobile Trade-In Calculator?

A T-Mobile trade-in calculator is an online tool designed to estimate the potential trade-in value of your current mobile device when you're looking to upgrade with T-Mobile. It takes into account various factors to provide an approximate credit amount that T-Mobile might offer for your old phone. This credit is typically applied towards the purchase of a new device or a new service plan. It simplifies the process of valuing your old device, moving beyond the guesswork often involved in retail trade-ins.

Who should use it:

  • Existing T-Mobile customers looking to upgrade their phone.
  • Individuals considering switching to T-Mobile and taking advantage of their trade-in offers.
  • Anyone wanting to understand the market value of their used smartphone before committing to a new purchase.
  • Consumers who want to maximize their savings on a new device through trade-in promotions.

Common misconceptions:

  • Myth: The calculator provides the exact, final trade-in value. Reality: It's an estimate. The final value is determined by T-Mobile after physical inspection of the device.
  • Myth: All devices have a significant trade-in value. Reality: Older or damaged devices may have very low or no trade-in value, especially if they don't qualify for specific promotions.
  • Myth: Trade-in credit is always immediate cash. Reality: Trade-in credit is almost always applied as a discount or bill credit towards future purchases or monthly bills, often spread over a period.

T-Mobile Trade-In Calculator Formula and Mathematical Explanation

The core of a T-Mobile trade-in calculator involves assessing the device's intrinsic value and then factoring in any applicable promotional offers. While T-Mobile's exact proprietary algorithms are not public, a generalized model can be represented:

Estimated Trade-In Value = (Base Device Value) + (Promotional Boost)

The Base Device Value is calculated based on the device's market desirability, condition, and specifications. A simplified approach might look like:

Base Device Value = Condition_Factor * Storage_Value * Model_Multiplier

The Promotional Boost represents additional credit offered by T-Mobile for specific devices, often tied to the purchase of a new, higher-tier device or a new line of service.

Variable Breakdown:

Key Variables in Trade-In Calculation
Variable Name Meaning Unit Typical Range
Device Model Specific make and model of the phone being traded in. N/A e.g., iPhone 14 Pro, Samsung S23
Device Condition Physical and functional state of the device (screen, body, battery). Percentage (0-100) 40% (Poor) to 100% (Excellent)
Storage Capacity Internal storage size of the device. Gigabytes (GB) 64GB, 128GB, 256GB, 512GB, 1TB+
Model Multiplier An internal factor representing the general resale value and demand for the specific model. Factor (e.g., 1.0 – 2.5) Varies greatly by device desirability and age.
Condition Factor A numerical representation derived from the selected condition rating. Factor (e.g., 0.4 – 1.0) Corresponds to selected condition (Poor=0.4, Fair=0.6, Good=0.8, Excellent=1.0).
Storage Value Factor A multiplier based on storage size, rewarding higher capacities. Factor (e.g., 1.0 – 1.5) Increases with GB (e.g., 128GB=1.0, 256GB=1.1, 512GB=1.25).
Base Device Value Calculated value before promotions. Currency ($) $0 – $1000+
Promotional Boost Additional credit from T-Mobile-specific deals. Currency ($) $0 – $1000+
Estimated Trade-In Value Total estimated credit. Currency ($) $0 – $2000+

Note: The actual multipliers and values are proprietary to T-Mobile and change frequently based on market conditions and promotional cycles. This calculator provides an approximation based on common industry practices and publicly available promotion structures.

Practical Examples (Real-World Use Cases)

Let's see how the T-Mobile trade-in calculator works with realistic scenarios:

Example 1: Standard Upgrade

Scenario: Sarah wants to trade in her well-maintained Samsung Galaxy S22 (128GB) for a new Samsung Galaxy S24 Ultra. She selects 'Good' condition and confirms there isn't a specific promotion tied to this exact trade-in at the moment, but she is getting a standard credit.

Inputs:

  • Device Model: Samsung Galaxy S22
  • Device Condition: Good (80%)
  • Storage Capacity: 128GB
  • New Device Model: Samsung Galaxy S24 Ultra
  • Trade-In Promotion Applied?: No (Standard Value)

Estimated Output:

  • Estimated Credit: $450
  • Base Value: $400
  • Promotional Boost: $50 (Standard promotional credit for S22)
  • Potential Savings on New Device: $450

Interpretation: Sarah can expect roughly $450 in credit towards her new Samsung Galaxy S24 Ultra. The calculator indicates that part of this value comes from a small standard promotion T-Mobile often offers even without major campaigns.

Example 2: High-Value Promotion

Scenario: John is looking to upgrade from his iPhone 13 Pro (256GB) in excellent condition to the latest iPhone model. T-Mobile is running a promotion offering significant credit for eligible devices when upgrading to a specific new iPhone.

Inputs:

  • Device Model: iPhone 13 Pro
  • Device Condition: Excellent (100%)
  • Storage Capacity: 256GB
  • New Device Model: iPhone 15 Pro
  • Trade-In Promotion Applied?: Yes

Estimated Output:

  • Estimated Credit: $1000
  • Base Value: $500
  • Promotional Boost: $500 (Aggressive promotion for iPhone 13 Pro trade-in)
  • Potential Savings on New Device: $1000

Interpretation: John's iPhone 13 Pro, due to its excellent condition, higher storage, and the activation of a major trade-in promotion, could yield up to $1000 in credit. This highlights the significant impact promotions can have when using the T-Mobile trade-in calculator.

How to Use This T-Mobile Trade-In Calculator

Using this T-Mobile trade-in calculator is straightforward. Follow these steps to get your estimated trade-in value:

  1. Enter Device Details: Accurately input the Model of the device you wish to trade in.
  2. Assess Condition: Honestly select the Device Condition from the dropdown menu (Excellent, Good, Fair, Poor). Be realistic to get the most accurate estimate.
  3. Specify Storage: Enter the Storage Capacity in Gigabytes (GB) for your current device.
  4. Identify New Device: Input the New Device Model you are interested in purchasing. While this doesn't directly affect the trade-in value itself, it helps contextualize the potential savings.
  5. Check Promotions: Indicate whether you believe a specific Trade-In Promotion is applicable. T-Mobile frequently runs targeted campaigns that significantly enhance trade-in values for certain devices or when purchasing specific new models.
  6. Calculate: Click the "Calculate Trade-In" button.

How to interpret results:

  • Estimated Credit: This is the total amount you can expect as a credit towards your new device or bill.
  • Base Value: This represents the inherent market value of your device based on its model, condition, and storage, before any special offers.
  • Promotional Boost: This shows any additional value added due to current T-Mobile promotions. If this is high, it means you're likely qualifying for a special offer.
  • Potential Savings on New Device: This simply equals the Estimated Credit, showing the direct discount you achieve on your next phone.

Decision-making guidance: If the estimated credit significantly lowers the cost of your desired new phone, it's likely a good time to upgrade. Compare the calculated value against what you might get selling the device privately. Remember that trade-ins offer convenience, while private sales might yield slightly more cash but require more effort. Use the T-Mobile trade-in calculator to compare different scenarios and promotions.

Key Factors That Affect T-Mobile Trade-In Results

Several elements influence the value T-Mobile assigns to your old device. Understanding these factors can help you prepare your device for trade-in and potentially increase its value:

  1. Device Model & Age: Newer, more popular, and higher-end models (like the latest iPhones or Samsung Galaxy flagships) inherently hold more value than older or budget models. T-Mobile prioritizes devices with strong secondary market demand.
  2. Device Condition: This is paramount. A device in pristine condition with no scratches, cracks, or functional issues will receive a much higher valuation than one with cosmetic damage or hardware problems. Ensure the screen is fully functional and the body is free from significant dents.
  3. Storage Capacity: Devices with larger storage capacities (e.g., 256GB, 512GB) are generally worth more than those with base storage (e.g., 64GB, 128GB), assuming the model is the same.
  4. Current Promotions & Campaigns: T-Mobile frequently runs device-specific trade-in promotions. These are often the largest drivers of value, sometimes offering hundreds or even over a thousand dollars in credit, especially when upgrading to premium new devices. Always check for active deals.
  5. Battery Health: While not always explicitly detailed in basic calculators, a device with excellent battery health (often above 85% maximum capacity) is more desirable. Poor battery life can sometimes lead to a lower condition rating.
  6. Unlocked Status & Carrier Compatibility: While T-Mobile trade-ins are primarily for their network, ensuring your device is "unlocked" from a previous carrier can sometimes influence its overall desirability and ensure smoother processing, though T-Mobile focuses on their own upgrade path.
  7. Functionality: The device must power on, have a fully functional screen without cracks or dead pixels, and have all essential features working (camera, buttons, ports). Devices with significant damage might be disqualified or receive minimal value.
  8. Market Demand & T-Mobile's Inventory Needs: Like any resale market, the value is influenced by how many people want that specific device and how many T-Mobile needs for its refurbishment and resale programs. This fluctuates constantly.

Frequently Asked Questions (FAQ)

Q: How is the trade-in value determined by T-Mobile?
A: T-Mobile determines the final trade-in value based on the device's model, age, cosmetic condition (screen, body), functional condition (buttons, camera, battery), storage capacity, and eligibility for current promotions. The value is assessed upon physical inspection at a T-Mobile store or via mail-in.
Q: Can I trade in a device that is still under contract with another carrier?
A: Generally, T-Mobile requires devices to be fully paid off and unlocked from their previous carrier before they can be accepted for trade-in. You'll need to clear any remaining balance and unlock the device.
Q: What happens if my device is damaged (e.g., cracked screen)?
A: If your device has a cracked screen or significant physical damage, it may still be eligible for trade-in, but likely at a lower value or only as part of specific "damaged device" promotions. Devices that don't power on are usually ineligible. Our calculator estimates based on condition tiers.
Q: Is the trade-in value a one-time credit or spread over time?
A: For most promotional trade-ins, the credit is typically applied as a monthly bill credit over a period of 24 or 36 months. This ensures customer loyalty. Some standard trade-ins might offer a direct discount at the point of sale.
Q: Can I trade in multiple devices for one new phone?
A: Typically, T-Mobile allows only one device to be traded in per new device purchase or line activation. Check specific promotion details, as rules can vary.
Q: What if the calculator shows a higher value than what T-Mobile offers me?
A: The calculator provides an estimate. The final offer depends on T-Mobile's inspection. Differences can arise from the precise condition assessment, eligibility for specific promotions (which can change daily), or differences in how storage/condition is valued internally by T-Mobile. Always verify with T-Mobile directly.
Q: Do I need to prepare my device before trading it in?
A: Yes. Back up all your data, perform a factory reset to erase personal information, remove SIM cards and memory cards, and unpair any associated accounts like iCloud or Google accounts.
Q: Can I trade in a tablet or smartwatch?
A: T-Mobile's primary trade-in program focuses on smartphones. While they might have separate, less common offers for tablets or smartwatches, this calculator is specifically designed for mobile phones.
var deviceModelInput = document.getElementById("deviceModel"); var deviceConditionSelect = document.getElementById("deviceCondition"); var storageCapacityInput = document.getElementById("storageCapacity"); var newDeviceModelInput = document.getElementById("newDeviceModel"); var tradeInPromoSelect = document.getElementById("tradeInPromo"); var calculateBtn = document.getElementById("calculateBtn"); var resetBtn = document.getElementById("resetBtn"); var resultsContainer = document.getElementById("resultsContainer"); var estimatedCreditSpan = document.getElementById("estimatedCredit"); var baseValueSpan = document.getElementById("baseValue"); var promotionalBoostSpan = document.getElementById("promotionalBoost"); var potentialSavingsSpan = document.getElementById("potentialSavings"); var primaryResultSpan = document.getElementById("primaryResult"); var deviceModelError = document.getElementById("deviceModelError"); var storageCapacityError = document.getElementById("storageCapacityError"); var chart; var chartContext; // Define base values and multipliers (these are illustrative and can be adjusted) // In a real-world scenario, these would be dynamically updated from T-Mobile's API or a database. var deviceValueData = { "iphone": { "14 pro": { "128": 550, "256": 600, "512": 650, "1tb": 700 }, "14": { "128": 450, "256": 500, "512": 550 }, "13 pro": { "128": 480, "256": 530, "512": 580 }, "13": { "128": 380, "256": 430, "512": 480 }, "se": { "64": 150, "128": 180, "256": 220 } }, "samsung": { "galaxy s24 ultra": { "256": 650, "512": 700, "1tb": 750 }, "galaxy s24+": { "128": 480, "256": 520, "512": 560 }, "galaxy s23 ultra": { "256": 580, "512": 630 }, "galaxy s23": { "128": 400, "256": 440 }, "galaxy a54": { "128": 150 } }, "google": { "pixel 8 pro": { "128": 500, "256": 540, "512": 580 }, "pixel 8": { "128": 400, "256": 440 }, "pixel 7a": { "128": 120 } } }; var conditionMultipliers = { "100": 1.0, // Excellent "80": 0.8, // Good "60": 0.6, // Fair "40": 0.4 // Poor }; var promoValues = { "yes": { "iphone": { "14 pro": { "128": 300, "256": 350, "512": 400, "1tb": 450 }, "14": { "128": 250, "256": 300, "512": 350 }, "13 pro": { "128": 280, "256": 330, "512": 380 }, "13": { "128": 200, "256": 250, "512": 300 }, "se": { "64": 80, "128": 100, "256": 120 } }, "samsung": { "galaxy s24 ultra": { "256": 400, "512": 450, "1tb": 500 }, "galaxy s24+": { "128": 300, "256": 350, "512": 400 }, "galaxy s23 ultra": { "256": 350, "512": 400 }, "galaxy s23": { "128": 250, "256": 280 }, "galaxy a54": { "128": 90 } }, "google": { "pixel 8 pro": { "128": 300, "256": 330, "512": 360 }, "pixel 8": { "128": 250, "256": 280 }, "pixel 7a": { "128": 70 } } }, "no": {} // No extra promo value if not selected }; function calculateTradeIn() { var modelInput = deviceModelInput.value.trim().toLowerCase(); var condition = parseInt(deviceConditionSelect.value); var storage = storageCapacityInput.value.trim(); var promoApplied = tradeInPromoSelect.value; var baseDeviceValue = 0; var promotionalBoost = 0; var estimatedCredit = 0; var potentialSavings = 0; // Reset errors deviceModelError.textContent = ""; storageCapacityError.textContent = ""; // Input validation if (modelInput === "") { deviceModelError.textContent = "Device model cannot be empty."; return; } if (storage === "" || isNaN(parseInt(storage))) { storageCapacityError.textContent = "Storage capacity must be a number."; return; } storage = parseInt(storage); var foundDevice = null; var deviceBrand = ""; for (var brand in deviceValueData) { for (var model in deviceValueData[brand]) { if (modelInput.includes(model)) { foundDevice = deviceValueData[brand][model]; deviceBrand = brand; break; } } if (foundDevice) break; } if (!foundDevice) { deviceModelError.textContent = "Device model not recognized or not supported."; return; } var availableStorage = Object.keys(foundDevice); var storageValue = 0; for(var i=0; i = currentStorage) { storageValue = foundDevice[availableStorage[i]]; } } if (storageValue === 0) { storageCapacityError.textContent = "Storage capacity not found for this model."; return; } var conditionFactor = conditionMultipliers[condition] || 0.5; // Default to fair if somehow invalid baseDeviceValue = storageValue * conditionFactor; // Calculate promotional boost if applicable if (promoApplied === "yes" && promoValues[deviceBrand] && promoValues[deviceBrand][modelInput] && promoValues[deviceBrand][modelInput][storage.toString()]) { var promoData = promoValues[deviceBrand][modelInput]; var promoStorageKey = storage.toString(); // Try to find the exact storage or the next lower one if exact not found if (promoData[promoStorageKey]) { promotionalBoost = promoData[promoStorageKey]; } else { // Simple approach: if no exact match, maybe take value from a slightly different storage if the model/brand is found // More robust logic needed for real-time updates or complex promo structures // For this example, we'll just check if any promo exists for the model, falling back if storage not specific if (Object.keys(promoData).length > 0) { // This part is tricky without exact mapping. A simpler approach: if a promo is ON, // and the model/brand is recognized, apply a generic promo boost or assume it's tied to base value calculation. // For this example, let's stick to specific storage mapping for promos. // If storageValue > 0 but promoData[promoStorageKey] is undefined, it means no specific promo for this storage. // Let's use the base value calculation for promo if exact storage isn't found but model is recognized. // This is a simplification; T-Mobile's actual promos are complex. // Example: If S23 Ultra 256GB promo is $350, and user enters 512GB, it might still be $350 or more. // For now, we'll only apply if storage matches a promo entry. // Let's refine: if promoApplied is 'yes', and we found *a* promo value for this device model, // we assign it. This assumes T-Mobile promo often applies to the model regardless of minor storage variations if a general promo is active. // To make it more accurate, we should map storage to promo values. // Let's assume promoValues keys are strings representing storage. var foundPromoStorage = false; for(var key in promoData) { if (key === promoStorageKey) { promotionalBoost = promoData[key]; foundPromoStorage = true; break; } } // If no exact storage match, maybe apply a reduced value or a default if available // For this example, we'll only apply if storage matches exactly. } } } // Fallback for promo if model identified but specific storage not found in promo structure if (promoApplied === "yes" && promotionalBoost === 0 && foundDevice && deviceBrand && promoValues[deviceBrand] && promoValues[deviceBrand][modelInput]) { // If a promo exists for the device model but not specific storage, T-Mobile might offer a standard promo value. // This is highly speculative. Let's assume for simplicity, if promo is ON and device recognized, base promo is $50-$100 if specific storage not listed. // Or, if the base value itself is high, promo might be incorporated. // For demonstration, let's stick to explicit promoValues mapping. // If we found a base value but no specific promo for storage, promo remains 0 unless a general promo is active for the model. // Let's try to get a generic promo value if available for the model, even if storage differs. var genericModelPromos = promoValues[deviceBrand] ? promoValues[deviceBrand][modelInput] : null; if(genericModelPromos) { var promoKeys = Object.keys(genericModelPromos); if(promoKeys.length > 0) { // If there are promo values listed for this model, pick one as a representative boost if exact storage not found. // This is a simplification. A real system needs robust mapping. // Let's assign the highest listed promo value for that model if exact storage isn't hit, or a minimum if available. // For now, keep it simple: only apply if exact storage matches. } } } estimatedCredit = baseDeviceValue + promotionalBoost; potentialSavings = estimatedCredit; // Savings = Credit in this context // Ensure values are not negative and format as currency estimatedCredit = Math.max(0, estimatedCredit); baseDeviceValue = Math.max(0, baseDeviceValue); promotionalBoost = Math.max(0, promotionalBoost); potentialSavings = Math.max(0, potentialSavings); estimatedCreditSpan.textContent = "$" + estimatedCredit.toFixed(2); baseValueSpan.textContent = "$" + baseDeviceValue.toFixed(2); promotionalBoostSpan.textContent = "$" + promotionalBoost.toFixed(2); potentialSavingsSpan.textContent = "$" + potentialSavings.toFixed(2); primaryResultSpan.textContent = "$" + estimatedCredit.toFixed(2); resultsContainer.style.display = "block"; updateChart(); } function resetCalculator() { deviceModelInput.value = ""; deviceConditionSelect.value = "100"; storageCapacityInput.value = ""; newDeviceModelInput.value = ""; tradeInPromoSelect.value = "yes"; deviceModelError.textContent = ""; storageCapacityError.textContent = ""; resultsContainer.style.display = "none"; estimatedCreditSpan.textContent = "$0.00"; baseValueSpan.textContent = "$0.00"; promotionalBoostSpan.textContent = "$0.00"; potentialSavingsSpan.textContent = "$0.00"; primaryResultSpan.textContent = "$0.00"; if (chart) { chart.destroy(); // Destroy previous chart instance } } function copyResults() { var model = deviceModelInput.value.trim(); var conditionText = deviceConditionSelect.options[deviceConditionSelect.selectedIndex].text; var storage = storageCapacityInput.value.trim(); var promo = tradeInPromoSelect.value === 'yes' ? 'Yes' : 'No'; var summary = `T-Mobile Trade-In Estimate:\n`; summary += `Device Model: ${model}\n`; summary += `Condition: ${conditionText}\n`; summary += `Storage: ${storage}GB\n`; summary += `Promotion Applied: ${promo}\n\n`; summary += `Estimated Credit: ${estimatedCreditSpan.textContent}\n`; summary += `Base Value: ${baseValueSpan.textContent}\n`; summary += `Promotional Boost: ${promotionalBoostSpan.textContent}\n`; summary += `Potential Savings: ${potentialSavingsSpan.textContent}\n`; summary += `————————–\n`; summary += `Primary Result: ${primaryResultSpan.textContent}`; navigator.clipboard.writeText(summary).then(function() { // Optionally show a success message alert("Results copied to clipboard!"); }).catch(function(err) { // Optionally show an error message console.error("Failed to copy results: ", err); alert("Failed to copy results. Please copy manually."); }); } calculateBtn.addEventListener("click", calculateTradeIn); resetBtn.addEventListener("click", resetCalculator); // Initialize chart if canvas exists var chartCanvas = document.getElementById('tradeInChart'); if (chartCanvas) { chartContext = chartCanvas.getContext('2d'); updateChart(); // Initial chart update } function updateChart() { var modelInput = deviceModelInput.value.trim().toLowerCase(); var condition = parseInt(deviceConditionSelect.value); var storage = parseInt(storageCapacityInput.value.trim()); var promoApplied = tradeInPromoSelect.value; var baseDeviceValue = 0; var promotionalBoost = 0; var chartBaseValue = 0; var chartPromoBoost = 0; // Recalculate for chart purposes var foundDevice = null; var deviceBrand = ""; for (var brand in deviceValueData) { for (var model in deviceValueData[brand]) { if (modelInput.includes(model)) { foundDevice = deviceValueData[brand][model]; deviceBrand = brand; break; } } if (foundDevice) break; } if (foundDevice && !isNaN(storage)) { var availableStorage = Object.keys(foundDevice); var storageValue = 0; for(var i=0; i = currentStorage) { storageValue = foundDevice[availableStorage[i]]; } } if (storageValue > 0) { var conditionFactor = conditionMultipliers[condition] || 0.5; chartBaseValue = storageValue * conditionFactor; if (promoApplied === "yes" && promoValues[deviceBrand] && promoValues[deviceBrand][modelInput] && promoValues[deviceBrand][modelInput][storage.toString()]) { chartPromoBoost = promoValues[deviceBrand][modelInput][storage.toString()]; } } } chartBaseValue = Math.max(0, chartBaseValue); chartPromoBoost = Math.max(0, chartPromoBoost); var data = { labels: ['Base Value', 'Promotional Boost'], datasets: [{ label: 'Trade-In Value Components', data: [chartBaseValue, chartPromoBoost], backgroundColor: [ 'rgba(0, 74, 153, 0.7)', // Primary Color for Base Value 'rgba(40, 167, 69, 0.7)' // Success Color for Promo Boost ], borderColor: [ 'rgba(0, 74, 153, 1)', 'rgba(40, 167, 69, 1)' ], borderWidth: 1 }] }; // Destroy existing chart if it exists to prevent memory leaks and redraw issues if (chart) { chart.destroy(); } // Create new chart if (chartContext) { chart = new Chart(chartContext, { type: 'bar', // Use bar chart for components data: data, options: { responsive: true, maintainAspectRatio: false, plugins: { legend: { position: 'top', labels: { color: '#004a99' } }, title: { display: true, text: 'Breakdown of Estimated Trade-In Value', color: '#004a99', font: { size: 16 } } }, scales: { y: { beginAtZero: true, title: { display: true, text: 'Value ($)', color: '#666' }, ticks: { color: '#666' } }, x: { ticks: { color: '#666' } } } } }); } } // Initial call to set up the chart (might show zeros if no input yet) // Update: deferring chart init until first calculation for cleaner UI // updateChart(); // Add event listeners for real-time updates on input change deviceModelInput.addEventListener('input', calculateTradeIn); deviceConditionSelect.addEventListener('change', calculateTradeIn); storageCapacityInput.addEventListener('input', calculateTradeIn); tradeInPromoSelect.addEventListener('change', calculateTradeIn);

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