Net mineral acres calculator
Turn a tract size and your ownership share into net mineral acres (NMA) — and, if you know your lease royalty, net royalty acres (NRA). Net mineral acres is the exact unit a cash offer is quoted in ($/NMA), so it is the number worth getting right first.
Want the dollars? Try our oil & gas royalty calculator →
This is an estimate for planning only — not legal, title, or financial advice. Actual net acres depend on the recorded deeds, prior conveyances and reservations, and how the tract is described. Confirm your interest with a title examination or your division order before relying on it in any transaction.
How this calculator works
Net mineral acres (NMA) is the acreage you actually own:
NMA = tract acres × your ownership fraction. A 1/4 interest under a 160-acre
tract is 40 NMA. Fractions like 1/4 are converted to a decimal (0.25)
before multiplying.
Net royalty acres (NRA) measures the royalty those minerals throw off once leased, standardized to a 1/8 royalty: NRA = NMA × (royalty ÷ 0.125). At a 1/8 (12.5%) lease, NRA equals NMA; at a 3/16 (0.1875) lease each mineral acre is worth 1.5 royalty acres. In short — NMA is how much you own; NRA is how much royalty it earns.
Net mineral acres is the exact unit a cash offer is quoted in ($/NMA), so it is worth getting right. For the dollar side, see the oil & gas royalty calculator and our mineral rights value guide.
Get a real cash offer — not just an estimate
We buy mineral and royalty interests directly — tell us what you have and we'll review your specific minerals against live permit, production, and lease data, then come back with a firm, no-obligation cash offer.
- No obligation, no fees. A free offer and a clear number. Walk away anytime — there is never a fee to you.
- We do the homework. We run your tract against the same permit, production, and ownership data the pros use.
- Close on your timeline. Cash at closing, title handled. Sell all of it, or just a piece.
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Net mineral acres — common questions
What are net mineral acres?
Net mineral acres (NMA) are the acres of minerals you actually own beneath a tract — the gross tract size multiplied by your fractional ownership. If you own a 1/4 interest under 160 acres, you own 40 net mineral acres. It is the standard unit buyers and lease bonuses are quoted in.
How do I calculate net mineral acres?
Multiply the gross (total) tract acres by your ownership fraction: NMA = gross acres × your interest. So a 1/8 interest in a 320-acre tract is 320 × 0.125 = 40 net mineral acres. If your interest is written as a fraction like 1/4, convert it to a decimal (0.25) first — this calculator does that for you.
Net mineral acres vs net royalty acres — what is the difference?
Net mineral acres (NMA) measure how much of the minerals you own. Net royalty acres (NRA) measure the royalty stream those minerals produce once leased, standardized to a 1/8 (12.5%) royalty. A higher lease royalty means more royalty acres per mineral acre: NRA = NMA × (royalty ÷ 0.125). At a 1/8 lease they are equal; at a 3/16 (0.1875) lease each mineral acre is worth 1.5 royalty acres.
What is a good price per net mineral acre?
There is no single number — non-producing minerals can run from under a hundred dollars per net mineral acre in quiet areas to several thousand in the core of an active play, driven by nearby drilling and local lease bonuses. Because a cash offer is quoted in dollars per NMA, knowing your net acres is the first step. See our royalty calculator and value guide, or request an offer below.