How it works
Estimated bytes = rows × (key bytes + pointer bytes) × overhead factor × index count.
Input definitions
- Table rows
- Enter the value in the labeled unit.
- Average indexed key bytes
- Enter the value in the labeled unit.
- Row pointer bytes
- Enter the value in the labeled unit.
- B-tree fill and overhead factor
- Enter the value in the labeled unit.
- Similar indexes
- Enter the value in the labeled unit.
A worked example
- Table rows
- 10000000
- Average indexed key bytes
- 24
- Row pointer bytes
- 8
- B-tree fill and overhead factor
- 1.3
- Similar indexes
- 3
Assumptions & limits
Uses only the values entered. Rates are illustrative inputs, not live quotes, legal rules or personalised advice. Check provider terms, local requirements and measurements before acting.
Sources & review
Maintained by AnsRio. Methods and examples use automated checks; this does not imply independent professional certification.
Method updated 2026-10-19. Content checked against the stated method and examples. Our verification approach.
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Common questions
Why is this approximate?
Database page headers, compression, included columns, collation and implementation details vary.
How does Database index storage overhead calculate the result?
Estimated bytes = rows × (key bytes + pointer bytes) × overhead factor × index count.
What should I verify before using Database index storage overhead?
Uses only the values entered. Rates are illustrative inputs, not live quotes, legal rules or personalised advice. Check provider terms, local requirements and measurements before acting.