Audit Log Retention Storage Calculator accuracy and testing

Formula source

• Retained TB = events per day x event KB / 1024 / 1024 x retention days x overhead factor x replicas / compression ratio / 1024.

Test cases

Known limitations

• This page documents the checked-in calculator logic and does not certify results for every real-world edge case.
• Use the result as a planning estimate unless the calculator page states a stricter purpose.

Assumptions

• Inputs are user-entered because healthcare policy, prices, retention requirements, and incident facts vary.
• Calculations run locally in your browser and do not store PHI, incident details, access logs, system names, or operating assumptions.
• This calculator does not define the retention period required for your organization.

Unit handling

• Audit Events per Day accepts numeric values.
• Average Event Size accepts values in KB.
• Retention Period accepts values in days.
• Compression Ratio accepts values in :1.
• Replica Count accepts numeric values.
• Index and Metadata Overhead accepts values in %.
• Storage Cost accepts values in $/TB-mo.
• Retained Audit Log Storage is displayed in TB.
• Daily Raw Logs is displayed in GB/day.
• Monthly Storage Cost is displayed as currency.
• Annual Storage Cost is displayed as currency.

Rounding rules

• Number displays use up to 2 decimal places in the calculator UI.
• Currency outputs are displayed with standard US dollar formatting.
• Input precision follows configured step values where provided.

Version history

Change log