It’s the basis for PE/VC. Mind you, the textbooks are written with fiat as the measuring stick.

If you ask nicely maybe nostr:npub1qny3tkh0acurzla8x3zy4nhrjz5zd8l9sy9jys09umwng00manysew95gx or nostr:npub1saxmd5km0vusxhl84tqeaqaysftezh3h6ne22h95efntutth42yqlju5fv can tell you how to measure in btc instead.