How to calculate Postgresql data volume?

Question

PostgreSQL

I did not find information on how to calculate how much the database will take?
I would like to know after what number of records one hard disk will no longer be enough.
And in general, there is data, on what amount of data what server resources are needed?
Well, there is a clean base. It occupies 300 meters. And in a year, statistics will ask for half a terabyte, and in two years one storage will not be enough. How to calculate?

Answer 1

Only insert/select - direct dependence on tables, their fields and indexes.
As soon as update/delete appears, it is impossible to name the result. Due to MVCC, vacuum operation, application duration requirements, and update/delete intensity, the size of the data on disk can significantly exceed the size of the dump of the same data.
IMHO, it doesn't make sense. Set monitoring, launch into battle, see statistics and trend. You can immediately see how fast the database grows when the disk space runs out, when (which is much more likely) - iops.