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How many years of rated SSD TBW remain?

Subtract recorded writes from manufacturer-rated TBW and use average daily writes to estimate when that rating is reached.

Formula version 2.0.0 · Last reviewed 2026-08-30

Preparing the calculator.

Calculator inputs and results

Editable example values

TBW is an endurance or warranty threshold, not a failure date. Look for Host Writes in an SSD SMART tool.

TBW
Advanced settings
%
How far baseline usage may move up or down. It provides the basis for the result range.

Check the inputs and calculate

Changing an input immediately clears the previous result so conditions cannot be mixed up.

Formula and assumptions

The result is when the manufacturer-rated TBW would be reached if the present host-write rate continues. It neither predicts failure that day nor guarantees operation until then.

Remaining TBW = rated TBW − cumulative written TB. Convert daily GB to the same TB basis, divide remaining TB by daily TB for days, then show years and a date.

Why the result can vary

Daily workload, write amplification, SMART attribute definitions, unit conventions, firmware, and usage patterns can separate host writes from internal NAND writes.

Example

Review endurance for a video-editing SSD

Inputs: 600TBW rating, 150TB written, 200GB written daily

Outcome: At the same rate, the remaining 450TB reaches the rating in about 2,250 days, or 6.2 years.

Cautions

  • This does not predict hardware failure or data-retention time.
  • Back up important data independently of the remaining TBW estimate.
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Frequently asked questions

Does an SSD fail as soon as it reaches TBW?

No. TBW is a manufacturer endurance or warranty-related figure, not the drive's actual failure date.

Can TBW be guessed from drive capacity?

It varies by exact model, NAND, and warranty, so this calculator does not guess. Check manufacturer documentation.

Which SMART value should I use?

Names and conversion differ by tool and manufacturer. Check model documentation for total host writes or its equivalent and verify the unit.