Net Mineral Acre (NMA)
The unit measuring how much of the mineral estate you own: gross tract acres multiplied by your fractional mineral interest.
A net mineral acre, or NMA, measures how much of the mineral estate you actually own under a tract. It equals the gross surface acres multiplied by your fractional mineral interest. Own a full 1/2 mineral interest under a 640-acre section, and you hold 320 net mineral acres.
NMA is the standard unit for pricing and comparing mineral deals. Offers are often quoted in dollars per net mineral acre, so getting the count right is essential. Mistakes usually come from undivided fractions buried in old deeds or from confusing gross acres with net.
NMA describes the size of the mineral position; net royalty acre normalizes for the royalty rate. Both feed into valuing a position, and you can sketch a quick number with our value calculator.