Choose the area or ownership percentage to solve for, then enter the other two values for the same tract.
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Net Mineral Acres Formula
The main formula for net mineral acres is:
- NMA = net mineral acres
- TMA = total mineral acres
- PO = percentage owned
If you know net mineral acres and percentage owned, the calculator can find total mineral acres:
If you know total mineral acres and net mineral acres, the calculator can find the ownership percentage:
Choose a solve mode and enter its two known values. The calculator converts area units consistently using the international acre and returns the selected result unit. Ownership must be 0%–100%; zero ownership cannot determine total area.
- Net mineral acres: Use this when you know the gross mineral acres and your ownership percentage.
- Total mineral acres: Use this when you know your net mineral acres and the percentage interest you own.
- Percentage owned: Use this when you know the total mineral acres and your net mineral acres.
Area Conversion Values Used
The table shows rounded area-to-acre factors. Calculations use 1 international acre = 4,046.8564224 square meters and 1 square mile = 640 acres.
| Unit | Abbreviation | Acres |
|---|---|---|
| Acre | ac | 1 |
| Hectare | ha | 2.47105 |
| Square meter | sqm | 0.000247105 |
| Square kilometer | sqkm | 247.105 |
| Square mile | sqmi | 640 |
Common Ownership Percentages
| Fractional Interest | Percentage Owned | Net Acres on 100 Total Acres |
|---|---|---|
| 1/2 | 50% | 50 net acres |
| 1/4 | 25% | 25 net acres |
| 1/8 | 12.5% | 12.5 net acres |
| 1/16 | 6.25% | 6.25 net acres |
| 1/32 | 3.125% | 3.125 net acres |
Example Problems
Example 1: Find net mineral acres
You own 25% of 160 total mineral acres.
Your net mineral acres are 40 acres.
Example 2: Find percentage owned
You have 12.5 net mineral acres out of 100 total mineral acres.
Your ownership percentage is 12.5%.
FAQ
What are net mineral acres?
Net mineral acres are the mineral acres you actually own after applying your ownership percentage. If a tract has 100 total mineral acres and you own 25%, you own 25 net mineral acres.
Are net mineral acres the same as royalty acres?
No. Net mineral acres measure mineral ownership in acres. Royalty acres usually include the royalty rate from an oil and gas lease. A person can own net mineral acres, but the royalty value depends on lease terms.
Can percentage owned be more than 100%?
For a single tract, percentage owned normally should not be more than 100%. If your result is over 100%, check that the total mineral acres and net mineral acres refer to the same tract and that the units match.
