Database & SQL
PostgreSQL VACUUM Threshold Calculator
Enter table row count, current dead tuples, and autovacuum settings to determine if autovacuum will trigger and estimate table bloat.
No data is transmitted — everything runs locallyTool
About this tool
PostgreSQL VACUUM Threshold Calculator
The PostgreSQL VACUUM Threshold Calculator determines autovacuum trigger conditions from table size, dead tuple count, and autovacuum configuration parameters.
• Check whether a high-write table will autovacuum frequently enough with default settings
• Calculate the dead tuple count at which autovacuum triggers for a given table size
• Determine autovacuum_vacuum_scale_factor needed to vacuum a large table more aggressively
• Estimate table bloat from dead tuple accumulation between vacuum runs
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FAQ
What does this tool tell you?
The PostgreSQL VACUUM Threshold Calculator determines autovacuum trigger conditions from table size, dead tuple count, and autovacuum configuration parameters.
What affects the result most?
Autovacuum trigger: dead_tuples > autovacuum_vacuum_threshold + autovacuum_vacuum_scale_factor × reltuples. Default threshold: 50 dead tuples + 20% of table — large tables rarely vacuum without tuning. Table bloat: dead tuples consume disk space until VACUUM reclaims — bloat ratio = actual_size / live_data_size.
How should I use the result?
The calculation is deterministic — the same inputs always produce the same output — so the most useful workflow is to vary one input at a time and see which factor moves the result most. That tells you where to focus your attention before committing to a decision.
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