Adding a type of currency calculater

Hi!
So I was fooling a bit around on this site for the European Central Bank: https://www.ecb.europa.eu/euro/exchange/html/index.en.html
And so I thought, how it could ease my ineer nerd, if numista automaticly calcultaed how many eg. Austrian Schilling, US Dollar or British Pound Sterling one have. Just within the same type of cash. So not the 1st modern Greek Drachma and the 3rd. Or maybe the option to do it within the same ruling authority too? If that makes sense? I think, especially for cois and bills still in use, or their valuese, it could be interesting. Like, I know Danish 1 øre is not legal tender anymore, but their currency, krone, is still in use.

There should probably be some sort of filter on which coins/notes one wants to be added together, but I'm interested in what you all have to say to my idea? It may have been suggested before, sorry if that's the case

- Jamtrup

Definitively not the first, second or even third time this idea was brought up but it is still a nice statistic for the collection page. One problem might be the sheer amount of currencies in circulation, it would need a whole page for its own.

Yeah, for when a coin/note is demonetized but the currency itself is still in use, it'd be nice just to see what the value would be. And it would also be neat if you could see how much in face value you own of a particular currency, maybe near the bottom of the "My coins/banknotes" page, just under "View the country list with my collection quantities". Maybe a "View the country list with my total face value" option would work.

But, of course, it's just a suggestion and doesn't really need to be implemented. It would still be nice though.

Yeah, I thought if you go into your collection, and eg. sort your collection of coins/notes by face value, then before a new type of currency begin, there could be a "In total: 12 Rentenphennig" Some more coins an then "in total 12 Reicsmark and 32 phennig" or "in total 12.32 Reichmark". I think, although maybe a bit hard to implement, it could be nice to select more specific "parts" of the currency, if one wants to take only in-use or not-in-use currency into account or the currency within a specific period, like the Dutch Gulden and Danish krone changed design and buying value around every half monarch, if that makes sense?

I don't think the idea with showing country list with quanteties is an ideal way to do it, since if we take Germany 1871-1948 then they have 5 different currencies, with different values: Take the hyperinflation currency, I'll easily have at least 1000 papirmark, but it would not be "usefull" for me, if I wanted to know just how many Reichsmark I have and nothing else, from that period.

That's my ideas at least. Any other's take on it?

- Jamtrup