Mineral owners are usually paid a proportionate share of a drilling unit, not a single well. Your royalty decimal is roughly your net mineral acres ÷ total unit acres × your royalty rate, applied to unit production. State spacing rules set unit size and density; force pooling can include a tract by order; long horizontals may use allocation/production-sharing by lateral length. Your decimal and the unit's remaining locations are central to value.
Most mineral owners are not paid on a single well that sits only on their land. They are paid a proportionate share of a drilling unit — a defined block of acreage the state and operator combine so a well can be drilled and produced efficiently. Understanding units explains your decimal interest and your check.
What a drilling unit is
A drilling (or spacing) unit is a tract of land — often 640 acres or more for a horizontal well — established under state spacing rules so that a well drains it efficiently and neighboring owners are protected. Your tract is pooled into the unit along with others.
How your decimal interest is calculated
Your royalty decimal is, in simple terms, your net mineral acres in the unit, divided by the total unit acres, multiplied by your royalty rate. Own 20 net acres in a 640-acre unit at a 25% (1/4) royalty, and your decimal is 20 ÷ 640 × 0.25. That decimal — shown on your division order — is applied to total unit production to compute your check.
You are paid your share of the unit, not the whole well — which is why two owners on the same well get different checks.
Spacing, pooling, and allocation
States set spacing rules that define unit size and well density. When owners do not all agree to pool voluntarily, force (compulsory) pooling can include a tract by regulatory order so development is not blocked. For long horizontal wells crossing several tracts, allocation or production-sharing methods split production by lateral length instead of a single unit.
Why it matters when you sell
Your decimal interest and the unit's remaining drilling locations are central to value. A buyer checks your unit's size, your decimal, and how many more wells the unit can hold. If your division-order decimal looks off versus your acreage and the unit size, it is worth reviewing before you sign anything — or before you sell.
Key Takeaways
- You are paid your share of a drilling unit, not the entire well.
- Decimal ≈ your net mineral acres ÷ total unit acres × royalty rate (aim for 25%).
- State spacing rules set unit size and well density.
- Force pooling can include a tract by regulatory order; allocation wells split by lateral length.
- Your decimal and the unit's remaining drilling locations drive value at sale.
Frequently Asked Questions
How is my royalty decimal calculated?
Generally your net mineral acres in the unit divided by total unit acres, multiplied by your royalty rate. That decimal, shown on your division order, is applied to total unit production to compute your check.
Why do I only get a fraction of the well's production?
Because the well produces from a whole unit of pooled acreage, and you own only part of that unit. You are paid your proportionate share, not the entire well.
What is a spacing unit?
A block of acreage — often 640+ acres for horizontal wells — established under state rules so a well drains it efficiently and neighboring owners are protected. Your tract is pooled into it.
Does the unit affect what my minerals are worth?
Yes. Your decimal interest and how many more wells the unit can hold are central to value. Buyers check both, and an off-looking decimal is worth reviewing before you sell.
Disclaimer: Buckhead Energy is not a tax, legal, or investment advisor, and nothing in this article should be construed as tax, legal, or investment advice. This information is general in nature and provided solely for your convenience and education. Every owner's situation is different — always consult a qualified CPA, tax professional, attorney, or financial advisor before making any decision regarding your mineral rights, taxes, or finances.