# How to Calculate NMA?
**URL:** https://www.mineralrightsforum.com/t/how-to-calculate-nma/78494
**Category:** Major County, OK
**Created:** [November 29, 2024, 4:18pm UTC](https://www.mineralrightsforum.com/t/how-to-calculate-nma/78494 "2024-11-29T16:18:29Z")
**Posts on this page:** 4
**Page:** 1
### Author:  [@NeelEnergy](https://www.mineralrightsforum.com/u/NeelEnergy)
#### Post date: [November 29, 2024, 4:18pm UTC](https://www.mineralrightsforum.com/t/how-to-calculate-nma/78494/1 "2024-11-29T16:18:29Z")
I inherited some minerals in Major County, Oklahoma - SW/4, NW/4 & Lot 1 of the SW/4 - Section 11, Township 20N, Range 10W. I’m not sure how to calculate how many acres this actually is as I only would own a half interest in this tract. Any websites or suggestions on how to calculate this for FREE?
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### Author:  [@TODD\_M\_Baker](https://www.mineralrightsforum.com/u/TODD_M_Baker)
#### Post date: [November 29, 2024, 7:21pm UTC](https://www.mineralrightsforum.com/t/how-to-calculate-nma/78494/2 "2024-11-29T19:21:50Z")
My guess is you mean the SW/4 NW/4 and Lot 1. Lot 1 is basically the W/2 of the SW/4, being called Lot 1 due to the river. The original BLM survey shows it as 38.25 acres, but is probably different today due to accretion & riparian rights. The SW/4 NW/4 is 40.00 acres, so originally the tract contained 78.25 acres. But as mentioned, it is probably different today. You will need to locate an updated survey to know exactly. I would start at the Major County Assessor’s office to see what they show the gross acreage to be. Good luck.
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### Author:  [@Bob77](https://www.mineralrightsforum.com/u/Bob77)
#### Post date: [December 1, 2024, 10:42pm UTC](https://www.mineralrightsforum.com/t/how-to-calculate-nma/78494/3 "2024-12-01T22:42:32Z")
Go with what Todd says, you can also check the Oklahoma County records for a new survey followed by a stipulation of interest if the river has moved enough to prompt a company to spend the money on a new survey.
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### Author:  [@system](https://www.mineralrightsforum.com/u/system)
#### Post date: [February 27, 2025, 4:18pm UTC](https://www.mineralrightsforum.com/t/how-to-calculate-nma/78494/4 "2025-02-27T16:18:57Z")
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