iPhone Upgrade Timing Estimator
Updated .
This estimator scores the real pressure to replace your iPhone across the four things that actually decide it: whether it still gets iOS updates, battery health, storage pressure, and age. Software support is weighted most heavily because it is the only one that is a security issue rather than a preference, and the only one no repair can fix.
How it works
The score adds independent pressures and interprets the total, on the principle that one failing clock is usually repairable and several at once are not.
| Condition | Points | Why weighted this way |
|---|---|---|
| No longer receiving iOS updates | 4 | The only security issue on the list, and the only one no repair can fix. |
| Battery health below 80% | 2 | Real, but a replacement fixes it for a fraction of the cost. |
| Battery health 80–85% | 1 | Approaching the threshold; plan rather than act. |
| Storage 90% or more full | 2 | Cannot be expanded, so it is a genuine hardware limit. |
| Storage 75–89% full | 1 | Under pressure; iCloud may resolve it. |
| Six or more years old | 2 | Support is likely to end within the planning horizon. |
| Four to five years old | 1 | Normal mid-life. |
Bands: 6+ upgrade now; 4–5 upgrade within 6–12 months; 2–3 fix rather than replace; 0–1 keep this phone. The unsupported-device score of 4 on its own lands in the second band, and combines with any other single pressure to reach the first — which is the intended behaviour, because an unpatched phone with any second problem should not be kept.
Worked example
A four-year-old iPhone that still receives iOS updates, at 84% battery health, with storage 78% full after a real clear-out.
Scoring: still supported (0), health between 80 and 85 (1), storage between 75 and 89 (1), age four to five (1). Total 3 of 10 — fix, do not replace. The reasons list names all three, and the recommended action is a battery replacement or an iCloud plan, each of which addresses a specific pressure at a fraction of the cost of a new phone.
Two variations show how the weighting behaves. Untick still receives iOS updates and the total jumps to 7 — upgrade now — because a single security-relevant failure outweighs three convenience ones combined. Alternatively, keep support but drop battery health to 74% and storage to 93%: the total reaches 6, also upgrade now, because at that point two hardware limits have arrived together and repairing both approaches the cost of replacement.
The estimator is a prompt, not a verdict on your finances. A score of 6 on a phone you cannot currently afford to replace still tells you something useful: move the highest-risk accounts off it first.
Frequently asked questions
Why is software support weighted so heavily?
Because it is the only item on the list that is a security problem rather than an inconvenience, and the only one no repair can address. An unpatched phone holding banking access carries risk that grows over time.
What does a score of 2 or 3 mean?
It means something specific is wrong and it is repairable. A battery replacement, a storage clear-out, or an iCloud plan addresses the actual pressure at a fraction of the cost of a new phone.
Should I enter storage before or after a clear-out?
After. A phone that is 95% full of downloaded video is not short of storage, it is short of maintenance, and entering the pre-clear-out figure produces a misleadingly high score.
Does this estimator account for wanting a better camera?
No. It measures pressure to replace rather than desire to upgrade, which are different questions. Wanting a new phone is a perfectly good reason to buy one; it just is not something a score can tell you.
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