A fixed non-participating royalty interest is a set fraction of total production that does not change regardless of the lease (for example, a flat 1/16 of gross), while a floating non-participating royalty interest is a fraction of whatever royalty the mineral owner's lease happens to provide — so its size floats up or down with the negotiated lease royalty.
Few things in mineral title cause more litigation than the difference between a fixed and a floating non-participating royalty interest, because both are written as a fraction and the words look almost the same. Yet they can mean very different amounts of money.
A fixed NPRI is a fraction of production: "a 1/16 royalty" means 1/16 of everything produced, period, no matter what royalty the lease carries. A floating NPRI is a fraction of the lease royalty: "1/2 of the royalty" means half of whatever the lease provides — half of a 1/8 lease is 1/16, but half of a 1/4 lease is 1/8. Same deed structure, double the share, depending only on the lease the executive signs.
The confusion is historical. For most of the twentieth century the "standard" lease royalty was 1/8, so people drafted royalty reservations assuming 1/8 forever — writing "1/16 royalty" and "1/2 of the usual 1/8 royalty" as if they were the same thing. When modern leases started carrying 3/16, 1/4, and higher royalties, those old deeds suddenly had to be read literally, and courts had to decide whether a given reservation was locked at a fixed fraction or floated with the new, larger lease royalty.
The result is a body of case law that turns on small wording differences — "1/16 of the oil and gas produced" (fixed) versus "1/2 of the royalty" (floating) — and on the notorious "double fraction" problem where a deed says something like "1/16 (being 1/2 of the usual 1/8 royalty)."
If you own a floating NPRI, higher lease royalties help you — when the mineral owner negotiates a 1/4 lease instead of 1/8, your share grows with it. If you own a fixed NPRI, you are locked at your fraction of gross no matter how good the lease is. Neither is inherently better; they are simply different assets, and which one you hold changes the value.
This is also why a careful buyer will not price an NPRI off a bare decimal. The same "1/16" can be a fixed 1/16 of production or a floating fraction that resolves to something else under the current lease — and the difference can be substantial. Buckhead Energy reads the reservation language and the operative lease before making an offer, so the interest is priced as what it actually is.
Start with the granting or reserving language in the deed that created the interest. Phrases tying the fraction to production ("of the oil, gas and other minerals produced and saved") point toward fixed; phrases tying it to the royalty ("of the royalty," "of the usual royalty," "of any royalty reserved in any lease") point toward floating. Double-fraction recitals ("1/16 being 1/2 of 1/8") are the ambiguous ones courts fight over, and they are state-specific.
Because the answer decides how much you own, an ambiguous NPRI is worth a qualified oil and gas attorney's read before you rely on a number. This page is educational information, not legal advice.
Non-Participating Royalty Interest (NPRI)
Oil & Gas Encyclopedia — all terms
Educational information only — not legal, tax, or investment advice. Consult a qualified attorney, CPA, or landman about your specific situation.
A fixed NPRI is a set fraction of total production (e.g., a flat 1/16 of gross) that never changes. A floating NPRI is a fraction of whatever royalty the lease provides, so it grows or shrinks with the negotiated lease royalty — half of a 1/8 lease is 1/16, but half of a 1/4 lease is 1/8.
Neither is inherently better — they are different assets. A floating NPRI benefits when the mineral owner negotiates a higher lease royalty; a fixed NPRI is locked at its fraction of gross regardless of the lease. Which you own changes the value.
Read the deed that created it. Language tying the fraction to production ("of the oil and gas produced") points to fixed; language tying it to the royalty ("of the royalty reserved in any lease") points to floating. Double-fraction wording like "1/16 being 1/2 of 1/8" is ambiguous and state-specific — have an attorney read it.
Because old deeds were drafted assuming the royalty would always be 1/8, writing "1/16" and "1/2 of the usual 1/8" as if identical. Modern leases carry higher royalties, so those deeds must now be read literally, and courts decide whether the fraction is locked or floats.
Yes. The same "1/16" can resolve to different amounts depending on whether it is fixed or floating under the current lease. A careful buyer reads the reservation language and the operative lease before pricing, rather than valuing off a bare decimal.
Yes — Buckhead Energy is a direct buyer of mineral, royalty, NPRI, and ORRI interests across the United States, producing or non-producing. Buckhead Energy makes a free written offer, pays the title and closing costs, and charges no broker commission.
Buckhead Energy buys mineral and royalty interests across all 50 states and has completed acquisitions in 33 states. Buckhead Energy is a direct buyer, not a broker — we purchase mineral and royalty interests with our own capital. Buckhead Energy has been buying mineral and royalty interests since 2006. Buckhead Energy holds an A+ rating with the Better Business Bureau.
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