Net Royalty Acres Calculator
Net royalty acres = net mineral acres × (lease royalty rate ÷ 12.5%). Buyers usually price offers for leased and producing minerals in dollars per NRA to standardize different tracts that have different lease rates. So knowing your NRA is the fastest way to judge an offer. Use the calculators below to convert between net mineral acres, net royalty acres, and your division order decimal.
Net Royalty Acres (NRA)
The unit buyers usually price offers in. NRA = NMA × (lease royalty rate ÷ 12.5%)
Division of Interest (DOI / NRI)
Your decimal share of a producing unit. This is the number on your division order and royalty check stub.
What is a net royalty acre?
Your royalty income depends on two things: how many mineral acres you own and what royalty rate your lease pays. A tract leased at a 25% royalty pays twice as much on the same production as one leased at 12.5%, so a price quoted per mineral acre leaves out the royalty rate, which is one of the biggest drivers of value.
Net royalty acres solve that by folding the royalty rate into the acre count. The industry standard sets one NRA equal to one net mineral acre leased at 12.5%, the standard royalty for decades. Acreage leased at a higher rate counts as proportionally more royalty acres: at a 25% royalty, each net mineral acre counts as two NRA.
Net mineral acres vs. net royalty acres
| Net mineral acres (NMA) | Net royalty acres (NRA) | |
|---|---|---|
| Measures | How much mineral ownership you have | How much royalty income that ownership commands |
| Formula | Gross acres × your mineral interest | NMA × (lease royalty rate ÷ 12.5%) |
| Depends on lease terms | No | Yes — royalty rate is the whole point |
| Used to price | Unleased / non-producing minerals | Leased and producing minerals |
Mixing up the two units is one of the most expensive mistakes owners make when comparing offers. At a 25% royalty, an offer of “$4,000 per acre” means twice as much money if the buyer is counting mineral acres instead of royalty acres. Always ask which unit an offer uses, then convert it to price per NRA before comparing.
How to calculate net royalty acres, step by step
- Find your net mineral acres. Gross acres in the tract × your ownership percentage. If you inherited a 25% interest in a 640-acre section, you own 160 NMA.
- Find your lease royalty. It is stated in your oil and gas lease, and modern leases typically fall between 12.5% and 25%.
- Apply the formula. NRA = NMA × (lease royalty rate ÷ 12.5%).
Worked example: 40 NMA leased at an 18.75% royalty is 40 × (18.75% ÷ 12.5%) = 60 NRA. If a buyer offers $240,000 for that interest, they are paying $240,000 ÷ 60 = $4,000 per NRA.
From your division order back to acres
Many owners, especially heirs, never see a deed with acreage on it. What they have is a division order or a royalty check stub showing a decimal like 0.01171875. That decimal is your division of interest (DOI), also called net revenue interest (NRI):
- DOI = (your NMA in the unit ÷ unit acres) × lease royalty rate
- NRA = DOI × unit acres × 8 (the royalty rate cancels out)
- NMA = DOI × unit acres ÷ lease royalty rate
Unit size appears on the division order or on the drilling permit, which is public on your state’s GIS viewer (the Texas Railroad Commission GIS map for Texas wells). The third calculator above handles both directions.
Why buyers quote dollars per NRA
Price per NRA lets a buyer compare a tract leased at a 25% royalty against one leased at 18.75% on equal footing, the same way price per square foot works in real estate. It also lets you sanity-check any offer: convert it to dollars per NRA, then weigh it against what comparable interests in your county trade for. Production status matters a lot here. Acreage held by producing wells (PDP) brings stronger per-NRA pricing than non-producing minerals, and interest types like an NPRI or ORRI are valued on their decimal rather than raw acreage.
To determine what a fair price per NRA is for your county, formation, and operator is what a real valuation determines. If you want that number, request a free valuation and we will walk you through how we got there, whether or not you ever sell.
Frequently asked
- What is a good price per net royalty acre?
- It varies enormously by basin, county, operator activity, and whether the acreage is producing. Core Permian Basin counties can trade at several thousand dollars per NRA or more, while quiet dry-gas counties may trade at a few hundred. The useful move is to convert every offer you receive into dollars per NRA so you are comparing like for like, then get an independent valuation.
- What is a division of interest (DOI) and where do I find it?
- Your division of interest, also called net revenue interest (NRI), is your decimal share of a producing unit’s revenue. It is printed on the division order the operator sends before first payment and on every royalty check stub. It equals your net mineral acres in the unit, divided by unit acres, multiplied by your lease royalty.
- Do net royalty acres apply to unleased minerals?
- Not really. NRA depends on a lease royalty rate, so it only applies to leased or producing acreage. Unleased, non-producing minerals are usually quoted in dollars per net mineral acre instead, often benchmarked against recent lease bonuses in the county.
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