Check it before you sign it
Decimal Interest Calculator
The division order decimal is the one number that decides what you get paid for as long as the well produces, and the operator's landman computed it once, in a hurry. Run it yourself. Fractions like 3/16 work fine in the royalty box.
Royalty owner: your division order decimal
Fill the three boxes and the decimal appears here.
net acres ÷ unit acres × royalty = decimal interest
Working interest owner: your NRI
Working interest and burdens in, NRI out.
WI × (1 − burdens) = NRI
This does the arithmetic; it does not run your title. A tract with an NPRI, an unleased cotenant, or a depth severance needs a landman, not a web page. If the operator's decimal and yours disagree past the eighth place, ask for the unit plat and the calculation sheet. They have one.