Calculate Storage Requirements
About Log Retention Calculation
This calculator helps DevOps engineers, system administrators, and compliance teams estimate storage requirements for log retention policies. It accounts for compression ratios and growth projections to give realistic infrastructure planning numbers.
How It Works
The formula for calculating total log storage is:
Base Storage = Daily Volume × Retention Days
Compressed Storage = Base Storage ÷ Compression Ratio
With Growth = Compressed × (1 + Monthly Growth Rate × Months ÷ 2)The growth calculation uses average growth over the retention period, assuming logs accumulate throughout the timeframe.
Compression Ratios
- gzip: Typically 5:1 to 8:1 for text logs
- zstd: 8:1 to 12:1, faster decompression
- lz4: 3:1 to 5:1, very fast
- xz/lzma: 10:1 to 20:1, slower but smaller
Cost Reference (as of 2024)
| Provider | Storage Type | Cost ($/GB/month) |
|---|---|---|
| AWS S3 | Standard | $0.023 |
| AWS S3 | Glacier Instant | $0.004 |
| Google Cloud | Standard | $0.020 |
| Google Cloud | Coldline | $0.004 |
| Azure Blob | Hot | $0.018 |
| Azure Blob | Cool | $0.010 |
Compliance Retention Requirements
Different regulations mandate specific log retention periods:
| Regulation | Minimum Retention | Log Types |
|---|---|---|
| PCI DSS | 1 year (3 months online) | Access logs, audit trails, security events |
| HIPAA | 6 years | Access logs, audit logs, security incidents |
| SOX | 7 years | Financial system logs, audit trails |
| GDPR | As needed (minimize) | Processing activities, consent records |
| SOC 2 | 1 year typical | Security events, access logs |
| GLBA | 6 years | Customer data access, security events |
| FERPA | 5 years | Education record access logs |
Note: Requirements vary by jurisdiction and interpretation. Consult legal counsel for specific compliance needs.
Privacy & Limitations
- All calculations run entirely in your browser -- nothing is sent to any server.
- Results are computed locally and should be verified for critical applications.
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Log Retention Calculator FAQ
What is Log Retention Calculator?
Log Retention Calculator is a free developer tools tool that helps you Calculate storage needs for log retention policies with compression estimates.
How do I use Log Retention Calculator?
Enter your input values, review the calculated output, and adjust inputs until you reach the result you need. The result updates in your browser.
Is Log Retention Calculator private?
Yes. Calculations run locally in your browser. Inputs are not uploaded to a server by default, and refreshing the page clears session data.
Does Log Retention Calculator require an account or installation?
No. You can use this tool directly in your browser without sign-up or software installation.
How accurate are results from Log Retention Calculator?
This tool applies standard formulas or deterministic processing logic for estimates. For medical, legal, tax, or investment decisions, verify with a qualified professional.
Can I save or share outputs from Log Retention Calculator?
You can bookmark this page and copy outputs manually. Results are not persisted in your account and are typically not embedded in the URL.