Free tool · Mineral valuation
Net royalty acre calculator.
Convert net mineral acres and a royalty rate into net royalty acres (NRA) — the standardized unit mineral buyers actually trade on. Free, no signup, works whether you know your royalty interest or your mineral interest plus the lease royalty.
NRA standardizes royalty to a 1/8 (0.125) basis so tracts at different royalty rates compare on equal footing. This is an estimate — confirm interest and acreage against the recorded instruments.
What is a net royalty acre?
A net royalty acre is one net mineral acre standardized to a 1/8 (12.5%) royalty. It measures the royalty income a position throws off — not how much rock you own. The 1/8 basis isn’t arbitrary: for most of the last century, 1/8 was the customary lease royalty, so the industry built royalty-acre math on it. One net mineral acre leased at exactly 1/8 equals one NRA, and a mineral acre is treated as containing eight 1/8-royalty acres.
Because the basis is fixed at 0.125, a higher lease royalty produces more NRA from the same acreage: a 1/8 lease yields 1 NRA per mineral acre, 3/16 yields 1.5, and 1/4 yields 2. That single number bakes the royalty rate in — so two tracts at different royalties finally compare on equal footing.
Which calculation should I use?
Both inputs land on the same answer — pick the one that matches what you already know:
If you know your royalty interest(the decimal you’d receive): NRA = (royalty interest ÷ 0.125) × net acres.
If you know your mineral interest and the lease royalty: NRA = ((mineral interest × lease royalty) ÷ 0.125) × tract acres. Your mineral interest times tract acres is simply your net mineral acres, so it’s the same formula written from raw inputs. Dividing by 0.125 is the same as multiplying by 8.
Worked example: 40 net mineral acres leased at 3/16 (0.1875) → (0.1875 ÷ 0.125) × 40 = 60 NRA. The same 40 acres at 1/8 = 40 NRA; at 1/4 = 80 NRA. The NRA count carries the royalty difference so your price per unit doesn’t have to.
How NRA places a value on minerals
Buyers and sellers quote price per NRA — not per acre — because $/NRA already nets out the royalty difference, so packages with different lease terms compare apples-to-apples. The headline offer math is simple: NRA × $/NRA = indicative value.
The $/NRA itself comes from comparable sales, filtered by production status, because the three statuses behave like three different markets:
Producing minerals are priced off cash flow — commonly a multiple of recent monthly royalty income (very roughly 3–6 years, i.e. about 36–72× a clean monthly average), with a discounted-cash-flow check on serious offers. Leased, non-producing minerals trade off the lease bonus — a rough 2–3× the most recent bonus per acre. Unleased minerals are speculative, anchored only by location.
Through 2026, brokers have quoted premium producing Permian royalty in roughly the $18,000–$25,000/NRA range in strong locations (higher in the core). Treat every figure as a directional range, not a quote — NRA standardizes royalty, it does not standardize geology, and the geology is where most of the spread lives.
Why buyers trade on NRA, not raw acres
Two 40-NMA tracts in the same county look identical — until one is leased at 1/8 and the other at 1/4. The 1/4 tract pays twice the royalty on every barrel. Priced per mineral acre they look equal, and one side just got robbed. Converted to NRA (40 vs 80), the gap is obvious before any money moves. That is the entire job of the metric: strip out the one variable — royalty rate — that otherwise makes two packages impossible to compare at a glance.
Common mistakes to avoid
Treating NRA as NMA.They’re only equal at a 1/8 royalty. Net mineral acres is what you own; net royalty acres is the income it throws off. Keep them as separate figures and never substitute one for the other.
Reading NRA > NMA as “extra” acreage.Any royalty above 1/8 makes NRA larger than NMA — that’s expected, not bonus acres. It’s the same minerals on a royalty-equivalent scale.
Not pinning the convention in the PSA.Some shops normalize to 1/8 (used here); others quote NRA against the raw royalty decimal — the two can differ by up to 8× for the same asset, and deals have nearly collapsed over the ambiguity. “Net royalty acre” is not a settled legal term: define the formula, the assumed royalty, and the treatment of unleased interests and NPRIs in writing before quoting a $/NRA.
Ignoring NPRI burdens. A non-participating royalty carved out of the minerals comes off the top, so compute NRA on the royalty net of it: NRA = NMA × ((royalty − NPRI) ÷ 0.125). (An ORRI is different — it burdens the working interest, not the mineral royalty.)
Backing into ownership from a division order.A division order is the operator’s interpretation of title, not title itself. Derive NMA and NRA from the recorded chain of title and use the division order only as a cross-check.
Comparing $/NRA across producing and non-producing. They’re valued on different bases (cash-flow multiple vs. bonus multiple) — a producing $/NRA is no benchmark for a non-producing tract. Segregate by status before you compare.
From the number to the deal.
For the full treatment — the $/NRA market, building an offer, and the 1/8-vs-8/8 convention trap — read the deep dive. And when you’re working real deals, Scout carries NRA and $/NRA as fields on every owner record, so the trading number lives next to the pipeline and the PSA.