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Docker Volume Size Calculator

Size persistent Docker volumes correctly based on data growth and retention needs.

About Docker Volume Size Calculator

Volume sizing must account for current data plus projected growth over the retention window, plus headroom for safety. Formula: size = (currentData + dailyGrowth × retentionDays) × (1 + headroom%).

Formula

Volume Size

size = (currentData + dailyGrowth × retention) × (1 + headroom%)

currentData
Current data in MB
dailyGrowth
Daily growth in MB
retention
Retention period in days

Worked example

With the default values below, Docker Volume Size Calculator returns Recommended Volume Size of 6.1. Change any input above and every figure here is recalculated in your browser.

Inputs used

Current Data Sizeaccepts 0–10,000,000 MB
500 MB
Daily Growthaccepts 0–1,000,000 MB/day
50 MB/day
Retention Periodaccepts 1–3,650 days
90 days
Headroomaccepts 0–100 %
25 %

Results

Recommended Volume Size
6.1 GB
Projected Data at Retention End
5,000 MB
Recommended Size
6,250 MB

Step by step

  1. 1Projected data at retention end= 5000MB
  2. 2With headroom= 6.1GB

Assumptions and limits

  • The result is derived only from the 4 inputs listed above. Anything not among them is not part of the calculation.
  • In particular, this calculator does not take inflation, tax or fees or charges into account.
  • Figures are rounded for display to 1 decimal place, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Frequently Asked Questions

What happens if a Docker volume fills up?

The container's writes will fail with ENOSPC errors, potentially crashing the application. Monitoring volume usage and having headroom prevents this.

Should I use named volumes or bind mounts?

Named volumes are managed by Docker and portable; bind mounts expose host paths directly. For production data, named volumes with a proper storage driver are recommended.

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