SSD Lifespan Calculator

Every SSD wears out a little with each write, and manufacturers publish a TBW (Terabytes Written) rating that describes how much data a drive can absorb before it’s likely to fail. This calculator turns that rating into something more useful: an estimated number of years the drive should last based on how much data you actually write to it each day.

What the Result Means

The calculator divides the drive’s TBW rating by your estimated daily write volume to produce an estimated lifespan in years. A result of “12 years,” for example, means that if you keep writing data at the rate you entered, the drive’s flash memory should still be within its rated endurance window twelve years from now.

This is not a countdown to guaranteed failure. TBW is a conservative endurance threshold set by the manufacturer, usually backed by a warranty period (commonly 3-5 years) and a TBW ceiling, whichever comes first. Most drives keep working well past their TBW rating, and most home users never get close to it in the first place — but the estimate is a useful sanity check, especially for anyone doing heavy video editing, running a server, or hosting a database on consumer-grade storage.

How This Calculator Works

The underlying math is simple division, but getting an accurate daily write figure is the part people usually get wrong:

1. Take the drive’s TBW rating (found on the spec sheet or box, e.g. 300TBW).
2. Estimate average daily writes in gigabytes. This includes the OS itself, page/swap file activity, downloads, game installs and patches, browser cache, and any video or file editing.
3. Convert TBW to GB (1TB = 1,000GB for this purpose) and divide by daily GB written to get days of life, then convert to years.

Worked example: a 1TB consumer SSD rated at 600TBW, used by someone who writes an average of 40GB per day (games, updates, some photo editing):

• 600TBW = 600,000GB of total rated endurance
• 600,000GB ÷ 40GB/day = 15,000 days
• 15,000 days ÷ 365 ≈ 41 years

That result illustrates why TBW is rarely the limiting factor for typical desktop use — most people replace a drive for capacity or speed reasons long before they’d ever write that much data to it. The calculator becomes more meaningful for workloads with much higher daily writes, like constant 4K video capture, torrenting/seeding at scale, or a drive used as a cache for network storage.

Important Limitations

• Daily writes vary a lot. A single big game install or a day of heavy video export can spike your true daily average well above a “typical” day, so use a realistic average, not your best-case day.
• TBW is a warranty threshold, not a cliff. Many drives continue operating after reaching their rated TBW; conversely, some can fail earlier due to controller issues, power problems, or manufacturing defects unrelated to write wear.
• Write amplification isn’t visible to you. The SSD’s controller often writes more to the flash than the OS reports due to wear-leveling, garbage collection, and file system overhead, so actual internal wear can run somewhat higher than raw file sizes suggest.
• TBW figures differ by capacity within the same product line. A 2TB version of a drive is usually rated for roughly double the TBW of its 1TB sibling, so always check the number for your exact capacity, not a “representative” figure for the product family.