Hello,
I’ve recently released the first public alpha version of Stacking Calculator. The idea is pretty straight forward. It pulls real data (Bitcoin Price, STX price, amount of liquid tokens + more to come after stacking comes online on the testnet) and calculates the amount of expected Bitcoin stacker can receive per one reward cycle.
I think the tool might be useful for existing STX holders, institutional investors, delegation services and 3rd parties. I have pretty long list of ideas what to improve, but it depends on your feedback. I am doing this for community members, not my self 
Any feedback would help. Let me know what you like about it, what you don’t, what are you missing, anything else.
PS: Big thank to Blockstack team and community members who provided early feedback!
Link to the website.