According to my database I have 1417 CDs, 136 LPs and I'm not sure about cassettes because I have plenty of them doubled up on CD and didn't categorise them
No, that's titles, and thankfully these days most double CD's come in single sized cases
Strangely enough I've had a database of my stuff since it was typed up on a Commodore 64. It went through times of not being updated but it started way back then with tapes and LPs so I could keep track of what I had when mates borrowed stuff.