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About this tool
Estimate what a used phone is worth from launch price, age, condition, storage variant, battery health and accessories.
This estimator works out what a used smartphone is worth by taking its launch price and multiplying it through a declining-balance retention curve for age, a cosmetic grade factor, a storage-variant factor, a brand-demand factor and additive adjustments for the box, bill, warranty, battery health and repair history. The default curve assumes 45% of value goes in the first year and 30% of the remainder each year after, which is roughly how organised buyback grids are shaped. Every factor is shown and can be replaced with numbers from a real quote.
Open Smartphone Resale Value Estimator on AltFTool — it loads instantly in your browser.
Enter the values you already know.
Fine-tune the options to match your scenario.
Read the result and use it in your planning or reporting.
A 15-month-old phone is priced at 15 months, not rounded to a year.
Shows the instant trade-in figure and the patient private-sale figure side by side.
No hidden grid — you can see and change the depreciation rates the model uses.
Roughly 40-50% of its launch price for a mainstream handset, and closer to 25-35% for models with the strongest resale demand. After the first year the fall flattens to about 30% of the remaining value per year, which is why a two-year-old phone typically fetches around a third of what it cost new.
Yes — heavily. Cracked front or back glass on a phone that still works typically halves what a working, scuffed unit fetches, because the buyer prices in a screen replacement plus their risk. A screen already replaced with a non-original part is also marked down, since it affects brightness, touch response and any remaining warranty.
A buyback site or exchange offer usually pays around 10-20% less than a private sale, in return for an instant, guaranteed price with no meetings, no haggling and no payment risk. Selling privately is worth the effort mainly on higher-value handsets, where that percentage is real money.
It does. Once battery health drops below 80%, most manufacturers treat the battery as due for replacement, and buyers price in that cost — expect a deduction of roughly the replacement price plus a margin. Replacing the battery with an official part before selling often recovers more than it costs on phones that still hold value.
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