# NPRI Calculations
**URL:** https://www.mineralrightsforum.com/t/npri-calculations/3591
**Category:** Barnett Shale
**Created:** [January 12, 2017, 6:01pm UTC](https://www.mineralrightsforum.com/t/npri-calculations/3591 "2017-01-12T18:01:07Z")
**Posts on this page:** 3
**Page:** 1
### Author:  [@Charlene\_Hill](https://www.mineralrightsforum.com/u/Charlene_Hill)
#### Post date: [January 12, 2017, 6:01pm UTC](https://www.mineralrightsforum.com/t/npri-calculations/3591/1 "2017-01-12T18:01:07Z")
I am currently working in West Texas and have some very convoluted NPRI’s to calculate. Has there a template developed for this or can someone give me some guidance. Example…Royalty in the holding lease is 1/8th. One of my people have an NPRI of 1/5 of 1/4 of 7/15 of 1/5. Another has 1/2 of 15/300 of 1/8th. Figuring the holding lease is the base 1/8th making it the equivalent of 100%, how do I generate the string of calculations to get the decimal interest I need.
Thanks Charley
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### Author:  [@Jennifer5](https://www.mineralrightsforum.com/u/Jennifer5)
#### Post date: [January 12, 2017, 7:47pm UTC](https://www.mineralrightsforum.com/t/npri-calculations/3591/2 "2017-01-12T19:47:43Z")
You might check with the Oklahoma Grady County forum or Stephens County forum for help.
M. Barnes is very good at these calculations. She might be able to help you.
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### Author:  [@system](https://www.mineralrightsforum.com/u/system)
#### Post date: [August 14, 2018, 10:40pm UTC](https://www.mineralrightsforum.com/t/npri-calculations/3591/4 "2018-08-14T22:40:45Z")