Vaults calculator

I think vaults is great thing and adding spare change to it even better but the best thing is that you can save in any currency and I do in XRPs but the problem is I can’t keep track of my investments is too many micro transaction each with different exchange rate and my idea is to add some kind of calculator which will be able to tell me how much I have spend in my local currency for my investment so I can see if is worth it to sell or not. I’m sure with software that shouldn’t be complicated to design and I think it will be very useful function.