Concepts
Royalty Decimal
Your royalty decimal is the share of a well's production revenue paid to you, expressed as a decimal like 0.00234567. It combines your net acreage in the unit, the unit size, and your royalty rate.
Every royalty check is one multiplication: the well’s revenue for the month times your decimal. Everything else on the check stub — prices, volumes, deductions, taxes — is detail around that. The decimal is the number worth checking.
How the decimal is built
For a single well or unit, the standard construction is:
(Your net mineral acres in the unit ÷ total gross acres in the unit) × your royalty rate = your decimal
Worked through: you own 20 net mineral acres inside a 640-acre unit, leased at a 1/5 (20%) royalty.
20 ÷ 640 = 0.03125 of the unit 0.03125 × 0.20 = 0.00625
If the same 20 net acres sat in a 1,280-acre unit — common for long horizontal laterals — the decimal halves to 0.003125. Nothing about your ownership changed; the denominator did.
Why decimals change
Owners often assume a decimal is permanent. It is not. It moves when:
- The unit is amended or expanded. A larger unit spreads the same royalty across more acreage. Our journal covers the mechanics in amended units.
- Allocation between tracts is recalculated, often after a survey correction or a new plat.
- A title problem is discovered or cured, which reassigns acreage among owners.
- A well is assigned to more than one unit, which can quietly dilute what a stub appears to show.
A decimal that changes without explanation is a fair thing to question. Operators can produce the calculation, and often a title opinion sits behind it.
Checking your own decimal
You can audit it with public information:
- Get the recorded unit designation or plat from the county or the state regulator. It gives the unit’s gross acreage and the tracts inside it.
- Confirm your net mineral acres in the tract from the deeds — see net mineral acre.
- Confirm the royalty rate in the operative lease, or the fixed fraction in the royalty deed if you hold a non-participating royalty.
- Run the arithmetic, then compare it to the decimal on the division order or check stub.
Two sources of legitimate difference: a fixed royalty fraction that does not float with the lease rate, and acreage that falls only partly inside the unit boundary. Both are common, and both are checkable.
When the decimal is wrong
If the number does not reconcile, ask the operator’s division order department in writing for the acreage and royalty rate they used. That single question resolves most disputes, because it exposes whichever input is wrong. Do not sign a stipulation of interest or a cross-conveyance to “fix” a decimal without understanding it — those documents can convey property, not merely correct a clerical entry.
An underpaid decimal that runs for years becomes a real sum. So does an overpaid one, which operators can recoup. Getting it right early is worth the letter.
Why buyers care
Any credible offer on producing minerals is built from the decimal, the wells it applies to, and the decline curve those wells are on. When we value an interest, verifying the decimal against county records is the first step, not the last — the method is described in how we value royalties. If you would like your decimal checked against the records, send us a check stub. We do that at no charge.