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SSD endurance calculator: TBW, DWPD & writes per day

Convert a documented SSD write rating and compare it with an explicit host-write workload.

Storage

SSD TBW and DWPD workload comparison

Convert a documented SSD write rating and compare it with an explicit host-write workload.

Example inputs · Replace these with your measurements to build your plan.

Method, example and sources
  1. Read the rating basis and term from the exact drive documentation.
  2. Convert TBW and DWPD using the entered capacity and a declared 365-day year.
  3. Multiply expected host writes per day by the planning term.
  4. Compare the workload with the rating without predicting a failure date.

Worked example. A 1 TB drive rated at 1 DWPD for five 365-day years corresponds to 1,825 TBW. This is a rating conversion, not a lifespan forecast.

Your planning result

Compare workload writes with the documented rating

Uses an explicit 365-day year to convert the stated TBW or DWPD rating.

Equivalent rated TBW
600TB
Equivalent rated DWPD
0.3288
Rated daily allowance
328.7671GB/day
Planned host writes
365TB
Rating used by plan
60.8333%
  • A write rating is not an estimated failure date or a warranty promise.
  • Host versus NAND writes, workload class, warranty conditions and exact drive capacity must use the manufacturer's basis.

From the catalog

Hard Drives/Solid State Drives

Explore related listings, then confirm the exact model requirements against your plan. These listings are not an automatic compatibility or capacity verdict.

Browse hard drives/solid state drives Get help with the specification

Read the exact rating basis

TBW expresses a documented amount of writes; DWPD relates daily writes to the rated drive capacity over a specified term. Use the exact model, capacity and workload class. A family name, NAND type or headline capacity cannot establish endurance. The conversion here uses an explicit 365-day year so the arithmetic can be compared with the manufacturer's stated convention.

A rating is not a countdown

The comparison uses the host writes you enter. Actual workload patterns, write amplification, operating conditions and warranty terms can matter, and some measurements describe NAND writes instead of host writes. Exceeding the modeled rating is a reason to investigate an appropriate drive, not a prediction of the day it fails. A result below the rating is not a reliability guarantee.

Worked example

A 1 TB drive rated at 1 DWPD for five 365-day years corresponds to 1,825 TBW. This is a rating conversion, not a lifespan forecast.

SSD endurance calculator: TBW, DWPD & writes per day — Uniqcli