You can only use this for BTC.
Bitcoin over time tends to be priced at 7000 times the number of users (in terms of market cap).
Number of Wallets*7000/(Circulating Supply or 21,000,000)
You can decide whether you want to use the Circulating Supply or 21,000,000 as a reference.
The default settings are using 21,000,000 because it seems...
One of the problems, with bitcoin, is that we miss long term bitcoin data. There is not a single source from which to gather the value of bitcoin in any moment from it's inception. Or at least from when it was first exchanged into exchanges. If you look at coinmarketcap the data go back to the 28 apr 2013. But mtgox...