SSD Lifespan Calculator
SSDs Wear Out From Writing, Not From Time
Unlike a spinning hard drive, a solid-state drive's memory cells degrade with each write cycle, which is why manufacturers rate SSDs by TBW — total terabytes written — rather than a simple age-based warranty. A drive rated for 600 TBW can theoretically absorb 600 terabytes of writes over its life before the manufacturer's endurance guarantee runs out. How long that takes in calendar time depends entirely on how much data you actually write to it every day.
The Formula
The TBW rating is converted from terabytes to gigabytes (×1000) so it's on the same unit as daily writes, then divided by the annual write volume (daily GB × 365 days) to get years until the rated endurance is used up.
Where This Estimate Matters
- Choosing a drive for a write-heavy role — a database server, a video-editing scratch disk, or a busy write-caching tier writes far more data per day than a typical desktop, and matching drive endurance to that workload avoids premature wear-out.
- Comparing consumer vs. enterprise SSDs — enterprise drives carry substantially higher TBW ratings than consumer drives of the same capacity, specifically to survive higher sustained write volumes.
- Warranty planning — SSD warranties are frequently capped by TBW as well as years (whichever comes first); this calculator shows which limit you'd actually hit first under your real usage pattern.
- Logging and caching workload design — applications that write logs, swap, or cache data continuously can be tuned to reduce daily write volume once its impact on drive lifespan is made concrete.
Same Drive, Different Workloads
| Daily Data Written | Estimated Lifespan |
|---|---|
| 20 GB/day (light desktop use) | 82.19 years |
| 50 GB/day (moderate/heavy use) | 32.88 years |
| Daily Data Written | Estimated Lifespan |
|---|---|
| 50 GB/day | 8.22 years |
The TBW rating matters as much as the daily write rate: at the same 50 GB/day workload, a 600 TBW drive lasts roughly four times longer than a 150 TBW drive.
How to Use This Calculator
- Enter the Drive TBW Rating (TB) from the manufacturer's spec sheet.
- Enter your estimated Daily Data Written (GB).
- Select Calculate to get the estimated lifespan in years (and days) until the rated endurance is reached.
Related Calculations
Sizing a RAID array to spread that write load across multiple drives? Use the RAID Capacity Calculator, or convert storage units with the Storage Calculator.