Docker Volume Size Calculator
Size persistent Docker volumes correctly based on data growth and retention needs.
Inputs
Current amount of data stored.
Expected data growth per day.
How long data is retained before cleanup.
Extra capacity buffer for safety.
Recommended Volume Size
6.1GB
Projected Data at Retention End
5,000MB
Recommended Size
6,250MB
Step by step
Projected data at retention end
500MB + 50MB/d × 90d
= 5000MB
With headroom
5000MB × (1 + 25%)
= 6.1GB
How it works
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
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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