How much total capacity of IPFS?

How much total capacity does IPFS currently have?

In other words, how large is the total disk capacity of the participating nodes?

is someone (somewhere) doing not calculate?

Does someone know the rough capacity?

IPFS is not Filecoin. Your IPFS “node” will only store what you tell it to store so the capacity of the network doesn’t really mean anything.

You can think of IPFS as a generalized bittorrent.