A $1,000 phone does not lose value in a straight line - it loses a quarter of its worth in the first year alone, then progressively smaller chunks after that. Run a $1,000 phone through three years of ownership and the math looks like this: 25 percent gone in year one (down to $750), 15 percent of what is left gone in year two (down to $637.50), then 10 percent of that in year three, leaving a resale value of about $573.75. Total depreciation over those three years comes to $426.25, or 43 percent of what you originally paid, which averages out to roughly $142 a year.
Laptops depreciate a bit more gently than phones, but the same declining-balance pattern holds - each year’s loss is a percentage of what the device is worth at the start of that year, not a percentage of the original price. A $1,500 laptop loses 20 percent in year one (down to $1,200), 15 percent of that in year two (down to $1,020), 12 percent in year three (down to $897.60), and 10 percent in year four, leaving a resale value around $807.84 after four years - total depreciation of $692.16. Cameras hold value noticeably better than either phones or laptops, since the underlying technology cycle moves slower and older camera bodies stay usable for longer.
The pattern that matters most for your wallet is that the steepest loss always happens in year one, which is exactly when most people are tempted to sell or trade in an old device to help pay for a new one. Holding a device for an extra year or two, once the depreciation curve has flattened out, means you absorb a much smaller percentage loss for each additional year of use. Waiting to sell rarely gets you a higher dollar price than selling immediately, but it can spread a similar total loss across far more months of actual use, which is the more useful way to think about the tradeoff.
How to read the year-by-year depreciation curve
Each device type in the dropdown carries its own set of yearly percentages, applied to whatever the device is worth at the start of that year rather than to the original purchase price. That is why the dollar amount lost keeps shrinking every year even though the percentage decline slows down only gradually - a smaller percentage of a smaller number is a much smaller dollar figure.
How to estimate resale value for a device you have owned for years
Enter your original purchase price and the number of years you have owned the device, and the calculator walks through each year’s depreciation rate in sequence. Past the point where the device-specific schedule ends, it settles into a flat 4 percent annual decline, reflecting how older electronics keep losing a little value every year without crashing the way a brand-new release does in its first year.
How to decide when to sell or upgrade
Because the first year or two carry the steepest losses, selling a barely-used device is usually the worst time to cash out relative to what you paid, even though it commands the highest resale price in dollar terms. Waiting until the depreciation curve flattens - typically two to three years in for phones and laptops, longer for cameras - means you absorb a smaller additional loss for each extra year you get to keep using the device.
How device type changes the math
Phones depreciate fastest of the five options here because new models arrive every year and older ones lose desirability quickly. Laptops, tablets, and headphones sit in the middle. Cameras depreciate the slowest, since a camera body from a few years ago still takes the same quality photos as a new one, and the core technology changes more slowly than phone chips or laptop processors.