An oil and gas royalty payment is calculated by finding your decimal interest — your net mineral acres in the unit divided by the total unit acres, times your lease royalty rate — and applying it to the well's production and sale price, then subtracting any severance taxes and lease-permitted post-production deductions. In short: decimal interest × production × price, minus taxes and deductions.
Calculating a royalty payment breaks into two steps: first find your decimal interest, then apply it to the money the well makes. The decimal is the fraction of the well's revenue that belongs to you; multiply it by the value of production and you have your gross royalty, before taxes and deductions.
Written out: gross royalty = decimal interest × (oil volume × oil price + gas volume × gas price), and net royalty = gross royalty − severance taxes − any lease-permitted post-production deductions. Everything else is filling in those numbers correctly.
Your decimal interest is net mineral acres ÷ unit (spacing) acres × lease royalty rate. For a multi-unit horizontal (allocation) well that crosses more than one section, multiply also by your section's share of the well's perforations. For example, 40 net mineral acres in a 640-acre unit at a 1/4 (25%) royalty gives 40 ÷ 640 × 0.25 = 0.015625. This is the same number that appears on your division order, and confirming it is the single most valuable check you can do — if the decimal is wrong, every payment is wrong. If you are unsure of your net mineral acres, see net mineral acres explained.
Next, take the well's production for the period (barrels of oil, thousand cubic feet — Mcf — of gas) and the prices actually received, and multiply through. Using the 0.015625 decimal above, suppose in a month the well produced 5,000 barrels of oil sold at $75 and 20,000 Mcf of gas sold at $3.00. Oil value = 5,000 × $75 = $375,000; gas value = 20,000 × $3.00 = $60,000; total = $435,000. Your gross royalty = 0.015625 × $435,000 = $6,796.88 for the month, before taxes and deductions. (These figures are illustrative — substitute your own volumes and realized prices.)
The gross figure is not what lands in your account. Two things reduce it. Severance (production) taxes are levied by most producing states as a percentage of the value of production and are withheld from the royalty. Post-production deductions — a proportionate share of gathering, compression, processing, and transportation — may be charged when the lease permits, reflecting midstream costs. A lease with a cost-free (no-deductions) royalty clause avoids the latter; an older lease may allow them. Your realized wellhead price also typically trails the headline benchmark by a basis differential, which is why the price used in the calculation should be your actual received price, not the quoted WTI or Henry Hub number.
You do not have to do this by hand. Our royalty calculator performs the same arithmetic from your inputs — acreage, unit size, royalty rate, perforation share, production, and price — and our guide to how royalties are calculated and to reading a royalty statement walk through the details and the line items on your check. If your computed figure differs materially from what you are paid, the usual culprits are a wrong decimal, unexpected deductions, or a realized price below the benchmark — each of which is worth investigating. This is educational information, not financial advice.
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Educational information only — not legal, tax, or investment advice. Consult a qualified attorney, CPA, or landman about your specific situation.
Find your decimal interest (net mineral acres ÷ unit acres × royalty rate, and for a multi-unit horizontal well × your section's perforation share), then multiply it by the well's production times the sale price to get gross royalty, and subtract severance taxes and any lease-permitted post-production deductions to get your net payment.
It is the exact fraction of a well's revenue that belongs to you: net mineral acres in the unit divided by total unit acres, times your lease royalty rate (times your section's perforation share on a multi-unit horizontal well). Example: 40 NMA in a 640-acre unit at 1/4 royalty = 0.015625. It appears on your division order.
Usually because the gross calculation omits severance taxes and post-production deductions (gathering, compression, processing, transportation) that a lease may permit, and because your realized wellhead price is typically below the quoted benchmark by a basis differential. Use your actual received price and check your lease's deduction language.
Yes — a royalty calculator performs the same arithmetic from your inputs (acreage, unit size, royalty rate, perforation share, production, and price). It estimates gross royalty; your actual check also reflects severance taxes, lease-permitted deductions, and your operator's realized prices.
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