Since 2018, Valor has recovered more than $32 million for mineral owners — and a meaningful share of that came from owners who signed leases or accepted offers priced against a unit they did not fully understand. The single most common source of confusion is the difference between net mineral acres and net royalty acres. They sound like the same thing. They are not.
One measures the dirt you own. The other measures the income stream that dirt produces, normalized so buyers can compare a tract in Reeves County against a tract in Grady County on the same yardstick. If you have an offer letter in front of you quoting a price per NRA, this post will show you how to translate it back to what you actually own — and what to check before you sign anything.
What net mineral acres actually measure
Net mineral acres is the plainest number in the mineral world. If you own 100% of the minerals under a 40-acre tract, you own 40 net mineral acres. If you own an undivided 25% interest under that same 40-acre tract, you own 10 net mineral acres. The formula is gross acres multiplied by your undivided mineral interest.
NMA does not care about your lease. It does not care whether you are leased at 1/8, 3/16, 1/5, or 1/4. It does not care whether the tract is producing, held by production, or completely unleased. It is a static measurement of the physical mineral estate you own — the same number today as it will be in ten years, unless you buy, sell, or inherit into a different position.
That stability is why NMA is the right unit for title work, probate, tax rendition, and estate planning. It is also why NMA on its own is a poor unit for pricing an offer. Two owners with identical 10 NMA positions can have wildly different economic value depending on how their minerals are leased. If you have not yet confirmed your NMA from county deed records, Valor’s courthouse mineral research guide walks through how to do that by state.
What net royalty acres actually measure
Net royalty acres is a normalized unit. It exists because buyers need one number that lets them compare a tract leased at a 1/8 royalty in a legacy East Texas field to a tract leased at 1/4 in the Midland Basin without doing algebra on every deal. The industry standard benchmark is a 1/8 royalty — the historical default going back a century.
The formula is: NRA = NMA × (royalty rate ÷ 1/8) or equivalently NRA = NMA × royalty rate × 8.
Work through the four examples that matter most:
10 NMA leased at 1/4 royalty: 10 × (0.25 ÷ 0.125) = 10 × 2 = 20 NRA
10 NMA leased at 1/8 royalty: 10 × (0.125 ÷ 0.125) = 10 × 1 = 10 NRA
10 NMA leased at 3/16 royalty: 10 × (0.1875 ÷ 0.125) = 10 × 1.5 = 15 NRA
10 NMA leased at 1/5 royalty: 10 × (0.20 ÷ 0.125) = 10 × 1.6 = 16 NRA
Same 10 acres of dirt in every case. The revenue interest under each barrel produced, however, ranges from 10 to 20 NRA. A buyer paying $10,000 per NRA would offer $100,000 for the 1/8 position and $200,000 for the 1/4 position — and both offers would be internally consistent from the buyer’s point of view.
This is also why royalty rate matters so much at the lease stage. The royalty fraction you negotiate today determines your NRA count for the life of every well drilled under that lease. For a full breakdown of why royalty rate beats bonus in the long run, read How to Negotiate an Oil and Gas Lease.
Why offer letters quote price per NRA — and why that matters to you
Almost every serious mineral buyer — private capital, royalty aggregators, publicly traded royalty trusts — underwrites in dollars per NRA. They do this because NRA is directly proportional to the barrel and MCF revenue stream a buyer will collect. A tract’s NRA count multiplied by projected production per acre and commodity price gives them a discounted cash flow input. NMA does not.
The practical consequence for a mineral owner: if you receive an offer that says “$8,500 per net royalty acre,” you cannot evaluate it until you know your NRA count — which means you need both your NMA and your royalty rate. If your family records show 40 NMA and your lease is at a 3/16 royalty, that is 60 NRA and the offer is $510,000, not $340,000.
This is where owners get hurt. If an owner sees “$8,500 per acre” and mentally applies it to their 40 NMA, they anchor to $340,000 and may accept an offer well below what the buyer was actually prepared to pay for their 60 NRA position. For context on what buyers already know about your tract before they send that letter, read You Just Got an Offer for Your Minerals. Here’s What the Buyer Already Knows.
The reverse problem also occurs. An owner with a 1/8 lease who assumes the buyer’s per-NRA quote applies to NMA overestimates the offer and pushes back on a fair number. Either way the mismatch between the unit the buyer is using and the unit the owner is thinking in creates avoidable friction and money left on the table. Valor’s mineral management team reviews offer letters routinely and translates them into both units before a client responds. If you have received an offer and want to understand whether the letter is a division order, lease offer, or purchase offer before doing the math, read Division Order, Lease Offer, or Buyout? How to Read the Letter About Your Mineral Rights.
Lease offers use the same math — with higher stakes
The NMA versus NRA distinction is not limited to purchase offers. It runs through lease bonus negotiations too, but with a twist: the royalty rate is the thing being negotiated, so the NRA figure is a moving target during the discussion.
Consider 20 NMA in a Reagan County section. A landman offers $2,000 per acre bonus at a 3/16 royalty. That is $40,000 in bonus for 30 NRA of long-term revenue exposure. A competing landman offers $1,500 per acre bonus at a 1/4 royalty. That is $30,000 in bonus for 40 NRA. The bonus is lower but the NRA count is 33% higher — and over a typical horizontal well’s producing life, the incremental royalty stream can dwarf the bonus differential many times over.
Owners who evaluate lease offers only on the front-end bonus per NMA systematically undervalue the royalty rate. This is one of the most expensive mistakes in the entire mineral owner playbook and it compounds every year the well produces. Across the 500,000 wells Valor manages, the pattern is consistent: royalty rate drives lifetime revenue far more than bonus does.
A simple checklist before you sign anything
Before you respond to a purchase offer or a lease proposal, work through these five items:
Confirm your NMA from title. Do not rely on family memory or an old division order. Pull the deeds and calculate gross acres multiplied by your undivided interest. If title is unclear or the paper trail is broken, read Inherited Minerals With No Paper Trail before you respond to anything.
Confirm the royalty rate on record. For a purchase offer this is the royalty in your existing lease. For a lease offer this is what is on the table. If you are not sure what your current royalty rate is, Valor’s royalty decimal calculator can help you work backward from your check stub.
Convert to NRA using NMA × royalty rate × 8. Write both numbers down side by side before you read the offer price.
Ask the counterparty which unit their price applies to — in writing. “/acre”isambiguous.”/NRA” or “$/NMA” is not. The distinction can be worth tens of thousands of dollars on a modest interest.
Compare against recent arm’s-length transactions in the same county and formation. A fair $/NRA in the Midland Basin is not a fair $/NRA in the SCOOP and neither is a fair $/NRA in the Haynesville. Valor manages minerals across 32 states and 13 major basins and can benchmark any offer against what comparable acreage is actually trading for. Start at Before You Sell or Lease for the full framework.
Contact Valor Today
Getting NMA and NRA right is the difference between negotiating from your buyer’s spreadsheet and negotiating from your own. Contact Valor today for a free, no-obligation review — our mineral management team will translate your offer into both units, benchmark it against comparable transactions in your county and formation, and tell you whether the number on the table lines up with what your minerals are actually worth. We review lease offers and purchase offers for owners across Oklahoma, Texas, and 30 other states.
The information provided by Valor in this blog is for general informational purposes only and is not intended to provide specific recommendations or legal or tax-related advice. This blog should not be used as a substitute for competent legal advice from a licensed attorney in your state.
Key Takeaways
- Net mineral acres measures the physical acreage you own — gross acres multiplied by your undivided mineral interest. It does not change based on your royalty rate or lease terms.
- Net royalty acres normalizes that ownership to a 1/8 royalty benchmark using the formula NMA u00d7 royalty rate u00d7 8. The same 10 NMA at a 1/4 royalty equals 20 NRA — double the economic exposure.
- Buyers quote offers in dollars per NRA because it is directly proportional to the revenue stream they will collect. Always confirm which unit applies before anchoring to any price.
- Lease negotiations have the same math but higher long-term stakes. A higher royalty rate increases your NRA count and compounds over every barrel the well produces — often far outweighing a larger upfront bonus.
- Before responding to any offer, confirm your NMA from title, convert to NRA, get the unit confirmed in writing from the counterparty, and benchmark against recent comparable transactions in the same county and formation.