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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.
The Smartphone Resale Value 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 'Launch price of your variant (INR)' and 'Age (months since you bought it)', then choose a Condition from Sealed / unused down to Cracked glass (×0.38).
Pick a Storage variant and 'Resale demand for the brand', and tick what applies under 'What else is true of it', such as 'Manufacturer warranty still valid' at +6% or 'Battery health below 80% / replacement due' at -9%.
Read 'Estimated value today' with the Instant trade-in and 'Patient private sale' figures, plus 'Losing per month' and 'Losing per day', and press Change under 'Depreciation assumptions' to edit the first-year drop.
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 in the first year — the default model here assumes 45%. This age-based curve is the same regardless of brand or resale demand; after the first year the fall flattens to about 30% of what is left per year, which is why a two-year-old phone typically fetches around a third of what it cost new. Resale demand instead moves the estimate through a separate demand factor applied on top of the age curve, not by changing how fast it depreciates.
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.
In this calculator's model, a buyback site or exchange offer pays about 24% less than the patient private-sale figure shown alongside it (before the launch-price cap or scrap-value floor kick in), 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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