SEARCH FOR YOUR MINERALS
Look up your producing interests on the county tax rolls at MineralHolders.com

Quick estimates for mineral and royalty owners. Fractions (1/8), percents (25%) or decimals (0.125) all work.

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1. Net Mineral Acres

How many mineral acres you own after your ownership share is applied to the tract.

From the deed or legal description
Your share of the minerals in the tract
Net Mineral Acres
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Enter both values
Gross Tract Acres × Ownership Fraction = NMA

2. Convert Between NMA, NRA & Decimal

Start with whichever number you have. The other two fill in as you type.

Not sure of your decimal? Look up your producing interests on the county tax rolls at MineralHolders.com
From title work, or calculator 1
The royalty in your lease, e.g. 1/8, 3/16, 1/4 or 25%
Shown on the well's drilling permit (Form W-1). Search RRC drilling permits or find the well on the RRC GIS map
Net Mineral Acres
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Net Royalty Acres (1/8 basis)
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Royalty Decimal (DOI)
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Enter a value above
NRA = NMA × (Royalty ÷ 1/8)  ·  Decimal = (NMA ÷ Unit Acres) × Royalty  ·  NRA = Decimal × Unit Acres × 8
If several wells share one unit, use the decimal and unit size once. Don't add up the NRA from each well in the same unit. Allocation wells, prior conveyances, or tracts that only partly fall in a unit can make these numbers disagree; send us your documents and we'll sort it out.

3. Estimated Monthly Royalty

A rough look at your share of a month's sales. Use the decimal from calculator 2 or your check stub.

Or fill in volume and price below
Estimated Monthly Royalty
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Enter a decimal and sales
Royalty Decimal × Gross Monthly Sales = Your Share (before severance taxes and deductions)

Why your check stub decimal may not match

A different number isn't always a mistake. Common reasons it can be right:

  • Only part of your tract falls inside the unit
  • Horizontal or allocation wells split production across tracts by a participation factor
  • Someone else owns a non-participating royalty under your tract
  • Your interest came through several deeds or heirs and the fractions combine

And reasons worth a closer look:

  • A lease amendment changed the royalty and the operator didn't update it
  • An heirship or probate fraction was entered wrong
  • The unit was resized and the decimals weren't recalculated
  • A simple data-entry error

Have your lease, division orders, recent check stubs, deeds or probate papers, and the unit plat handy. That's everything we need to check your numbers.

Worked example. You own 1/8 of the minerals under a 160-acre tract: 160 × 1/8 = 20 NMA. Leased at a 1/4 royalty, that's 20 × (1/4 ÷ 1/8) = 40 NRA. If the tract is pooled into a 640-acre unit, your decimal is about (20 ÷ 640) × 1/4 = 0.0078125. Put any one of those three numbers into calculator 2 and it gives you the other two.
These are estimates for general information only. They don't confirm title, lease terms or what an operator owes you. Actual decimals can depend on lease language, unit and pooling documents, and title.
Want to know what your minerals are worth? WE KEEP ALL INFORMATION CONFIDENTIAL.
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