Estimate how long a rated SSD endurance lasts at the amount of data you write on a normal day. The result is the specification spread over a year. It is not a prediction of the day the drive will fail.
SSD endurance calculator
The result updates from the fields above. This form does not store the numbers you enter.
What the result means
Rated years is how long the published terabytes-written figure would last if you wrote the same amount every day. Drive writes per day compares that daily amount with the capacity. A result of 0.02 means you write about 2 percent of the drive per day. Consumer drives are often rated for a low daily write load over several years, so a small daily copy can produce a very long rated life.
Formula and example
Years = TBW ÷ ((daily GB ÷ 1024) × 365). A 600 TBW rating and 20 GB written per day is 20 ÷ 1024 = 0.0195 TB per day, or about 7.13 TB per year. 600 ÷ 7.13 is about 84 years of rated writes. Drive writes per day is 20 ÷ 1000 = 0.02 on a 1000 GB drive.
What this number cannot tell you
TBW is an endurance rating from the manufacturer, usually until the drive has used its spare area under a specific test. Heat, firmware, a nearly full drive, and lots of small writes can wear a drive sooner. The calculator does not read SMART data and does not know how much of the rating you have already used. A long result is not a warranty.
Questions people ask
Where do I find TBW?
On the drive specification or datasheet, often next to capacity. It is sometimes written as terabytes written. If you only have DWPD and a warranty length, TBW is roughly DWPD × capacity in TB × warranty years × 365.
Does a longer result mean the drive is safer?
It means the rated write budget is large compared with your daily use. Drives also fail for reasons that have nothing to do with that budget.
Should I use the drive size or the file size?
Capacity is the drive size. Daily writes are the new data you save, including downloads, video, and backups. Copying a folder twice is two writes.
