Hosting

Log Storage Calculator

Estimate retained log volume from daily log generation, compression ratio, and retention period.

Last reviewed: April 30, 2026Free toolMethodology

Log Storage Calculator

These fields start with sample inputs. Keep them or replace them, then run the tool to show a fresh result.

Number fields accept plain values and common formatted input such as 250000, 250,000, or 1,234.56.

Result

Calculating the sample result.

Why it matters

Log retention can quietly become one of the largest infrastructure line items in high-volume systems.

When to use

  • Sizing observability storage
  • Comparing retention changes
  • Evaluating the financial effect of log reduction efforts

Inputs & Outputs

Inputs

  • Daily raw log volume is the amount of logs generated before compression.
  • Compression ratio is the fraction of raw data kept after compression, such as 0.25 for 75% reduction.
  • Retention days is the number of days the compressed logs are stored.

Outputs

  • Retained log volume shows the stored footprint after compression over the retention period.
  • Daily compressed volume makes the compression effect easier to interpret.

Compressed retention method

Multiply daily raw log volume by the compression ratio to get stored daily volume, then multiply by retention days.

Retained log volume = daily raw volume x compression ratio x retention days

Worked example

1

Observability planning

A system produces 320 GB of raw logs per day, compresses to 30% of raw size, and retains logs for 45 days.

Inputs

  • Daily raw volume: 320 GB
  • Compression ratio: 0.30
  • Retention: 45 days

Steps

  • Daily compressed volume = 320 x 0.30 = 96 GB
  • Retained volume = 96 x 45 = 4,320 GB

Result

  • Retained log storage is about 4.32 TB.

Edge cases & caveats

  • Real compression performance varies by log type and provider.
  • Hot and cold storage tiers are not modeled separately here.

Frequently Asked Questions

What if my provider bills ingestion and storage separately?

Use this calculator for storage only. Ingestion cost should be modeled separately using the raw daily volume.

Why use a compression ratio instead of a percentage reduction?

Because the storage calculation needs the remaining fraction of raw data after compression.

Keep going

Related Tools

hosting

Cloud Storage Cost Calculator

Estimate monthly storage cost from stored gigabytes and the provider's per-GB monthly rate.

Open
hosting

Backup Retention Calculator

Estimate backup storage volume from backup size, frequency, and retention period.

Open
hosting

Database Storage Calculator

Estimate database storage footprint from row count, average row size, and index overhead.

Open