Phone Depreciation Rate Calculator

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Phone Depreciation Rate Calculator

Total Value Lost: $0.00
Total Percentage Loss: 0%
Monthly Depreciation: $0.00 / mo
Annual Depreciation Rate: 0%

How Smartphone Depreciation Works

Unlike cars, smartphones often lose value at an even more aggressive rate. Phone depreciation is the difference between what you originally paid for your device and what you can currently sell it for on the secondary market. On average, a new smartphone loses between 30% to 50% of its value within the first year of ownership.

Understanding the Calculation

Our calculator uses several metrics to help you understand your device's financial health:

  • Total Value Lost: The raw dollar amount the phone has decreased in value since purchase.
  • Total Percentage Loss: This represents the total drop in value relative to the purchase price.
  • Monthly Depreciation: This calculates the "cost of ownership" per month, showing how much money you effectively spent to use the device each month.
  • Annual Rate: The percentage of value lost per year, which is crucial for comparing the value retention of different brands like Apple vs. Samsung.

Example Calculation

If you purchased a high-end flagship phone for $1,200 and, after 18 months, the current resale value on trade-in sites is $600:

  • Total Value Lost: $600
  • Total Percentage Loss: 50%
  • Monthly Depreciation: $33.33 per month
  • Annual Depreciation Rate: 33.3% per year

Factors That Accelerate Depreciation

Several factors influence how quickly your phone's value drops. Technical obsolescence is the primary driver; as new models with faster processors and better cameras are released, older models become less desirable. Physical condition is the second most important factor—cracked screens or heavy scratches can instantly slash the resale value by 40% or more. Lastly, battery health is becoming a major metric for buyers; a phone with less than 80% maximum battery capacity is generally valued much lower.

function calculateDepreciation() { var purchasePrice = parseFloat(document.getElementById('purchasePrice').value); var currentValue = parseFloat(document.getElementById('currentValue').value); var monthsOwned = parseFloat(document.getElementById('monthsOwned').value); if (isNaN(purchasePrice) || isNaN(currentValue) || isNaN(monthsOwned) || monthsOwned purchasePrice) { alert("Current value cannot be higher than the purchase price for depreciation calculations."); return; } // Calculations var totalLost = purchasePrice – currentValue; var percentLost = (totalLost / purchasePrice) * 100; var monthlyLoss = totalLost / monthsOwned; // Annualized percentage rate calculation // Using the CAGR formula for depreciation: 1 – (Current/Initial)^(1/years) var yearsOwned = monthsOwned / 12; var annualRate = (1 – Math.pow((currentValue / purchasePrice), (1 / yearsOwned))) * 100; // Display Results document.getElementById('resultsBox').style.display = 'block'; document.getElementById('totalLostResult').innerText = '$' + totalLost.toLocaleString(undefined, {minimumFractionDigits: 2, maximumFractionDigits: 2}); document.getElementById('percentLostResult').innerText = percentLost.toFixed(1) + '%'; document.getElementById('monthlyLossResult').innerText = '$' + monthlyLoss.toFixed(2) + ' / mo'; // Handle edge case where value hasn't dropped if (totalLost === 0) { document.getElementById('annualRateResult').innerText = '0%'; } else { document.getElementById('annualRateResult').innerText = annualRate.toFixed(1) + '%'; } // Scroll to results on mobile if (window.innerWidth < 600) { document.getElementById('resultsBox').scrollIntoView({ behavior: 'smooth' }); } }

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