Under size of property I have 8 acres
Production unit there are 641.02 acres
Percentage of ownership I came up with 1.246. Divided 8/641.02 and hit percent
Royalty percentage I have 3/16 so I entered 18.75
This automatically enters a decimal of .00002916
Barrels per day is 851x30=25,530
You run the calculation and it comes up with 76.79 per month
Don't forget your gas/month that comes with it as well.
You can use a general price of $4.00/mcf until you see your BTU value which will up the price a bit. Gas volumes run two months behind while oil is usually a month behind.