Technology & Computing
SSD Over-Provisioning & DWPD Endurance Calculator
Estimate SSD endurance in drive-writes-per-day terms and the effect of over-provisioning on write amplification.
Your inputs
Change any value to update the result instantly.
Total bytes written (TBW) endurance
822.272 TB
Usable capacity
450.56 GB
Spare (over-provisioned) area
61.44 GB
Approx. write amplification relief factor
0.1364
Higher over-provisioning reduces write amplification and improves sustained performance and endurance, at the cost of usable capacity.
Formula and working
Usable capacity = Raw capacity × (1 − OP%); Endurance (TB written) = DWPD × usable capacity × warranty days
- 1
Collect the inputs
Raw NAND capacity (GB) = 512; Over-provisioning percentage = 12 %; Rated drive-writes-per-day (DWPD) = 1; Warranty period (years) = 5
- 2
Apply the formula
Usable capacity = Raw capacity × (1 − OP%); Endurance (TB written) = DWPD × usable capacity × warranty days
- 3
Result
Total bytes written (TBW) endurance = 822.272 TB
Frequently asked questions
Important limitation
This is an educational estimate based only on the values and formula shown. Verify current rates, rules, units, and professional standards before relying on the result. It is not personalized financial or investment advice.
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