Get the size of a database SELECT pg_size_pretty(pg_database_size('somedatabase')) As fulldbsize; Get the size of a table (excluding the indexes) SELECT pg_size_pretty( pg_relation_size('your_table') ); Get size of a table (including the indexes) SELECT pg_size_pretty( pg_total_relation_size('your_table') ); Get the list of all databases including their sizes SELECT tablename,pg_size_pretty(pg_total_relation_size(tablename)) AS total_usage FROM pg_tables WHERE schemaname != 'pg_catalog' AND schemaname != 'information_schema' Get list of tables in information schema ‘database’ SELECT * FROM information_schema.tables; Get a list of all the db sizes for all the dbs on a server SELECT datname as "DB Name", pg_size_pretty(pg_database_size(datname)) AS "Full DB Size" FROM pg_catalog.