I was playing around with excel today trying to figure out a formula for calculating the SP and SBD rewards given here on the site. I thought why don't I make calculator to see the "close to" reward will be, since the reward curve is very math intensive. So there is no real way to be 100% accurate. So playing with the numbers I made an excel GUI you can download and use:
Google Drive:
https://drive.google.com/open?id=1Xv0uKNZmGeNHLBy8MPNMrPOi1pHjdOdE
Works best with Microsoft Excel, but you can use Google Sheets. The only thing with Google Sheets is you will need to manually input the current price of STEEM and SBD for it to work. The Excel version has the API embedded so all you need to do is "Refresh" the "Data" tab.
Let me know what you think! As a bonus it has a 
How to use:
Just input your reward amount into the "REWARD" box and press "ENTER"
In EXCEL just "Refresh" the Data to get an up to the minute STEEM / SBD Price
Please RESTEEM and UPVOTE if this helped you!
If any of you awesome dudes can try this out! Let me know! 
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