SSD Endurance Calculator

Features

• Enter capacity, TBW, daily writes and warranty to get four key figures
• DWPD by the JEDEC definition: TBW ÷ (capacity × warranty days)
• Full-drive writes and expected lifetime in years
• Marks whether the TBW is exhausted inside or beyond the warranty
• TBW and capacity are both decimal (10¹²), so neither drifts 10% against the OS TiB
• A missing TBW rating (0) never divides by zero — it says so instead
• Computed locally, nothing leaves the browser

How to use

1. Enter the capacity (TB) and the rated TBW (leave 0 if not rated)
2. Enter daily writes and the warranty years
3. Read DWPD, full-drive writes and expected lifetime

FAQ

Why is my DWPD different from the figure someone else gives?

Most often a mix of bases. The TB in TBW is 10¹² bytes (the vendor’s basis) while the OS reports capacity in 2⁴⁰ TiB — about a 10% gap. This tool works entirely in decimal bytes and shows the capacity in both bytes and TiB so you can check.

How do TBW and DWPD relate?

DWPD = TBW ÷ (capacity × warranty days), i.e. how many times per day the whole drive could be rewritten, averaged over the warranty. Vendors commonly quote DWPD over a 5-year warranty at 0.3–1 per day; TBW follows from the same formula.

My drive has no TBW rating. Can it still be worked out?

No lifetime or DWPD — both need TBW in the numerator. The tool says “not rated” rather than dividing by zero and returning infinity. For such a drive only the warranty years are known.

Does reaching TBW mean the drive dies?

TBW is a warranty write figure, not a failure switch. A drive can usually keep writing past its TBW; the vendor simply stops guaranteeing it, and many drives exceed their rating substantially. This tool computes when TBW is used up, not when the drive fails.