Work out your royalty decimal, then check every statement line against it
Decimoor shows the royalty decimal the way the operator should have worked it out, one step at a time, then compares it with the decimal on your division order. Paste or type statement lines and it checks the maths, your decimal, deductions and the price against EIA WTI and Henry Hub benchmarks. Everything stays in your browser.
Worked example: an inherited 1/3 of 1/4 of the minerals under a 160-acre tract, 3/16 royalty, pooled into a 640-acre unit
| Step | Formula | Result |
|---|---|---|
| Net mineral acres | 160 × 1/4 × 1/3 | 13.3333 |
| Mineral share of the tract | 13.3333 ÷ 160 | 0.083333 |
| × royalty rate | × 3/16 | 0.015625 |
| × tract share of the unit | × 160 ÷ 640 | 0.00390625 |
| Royalty decimal | <b>0.00390625</b> |
Source: Formula as published on the Decimoor page FAQ; numbers computed for this example (10 Oct 2026). It is the same case the Decimoor demo uses.
Decimoor vs the alternatives
Published prices, each checked on the date shown; prices change, so confirm on each site.
| Product | Price | Free | Checked |
|---|---|---|---|
| Decimoor Pro | $9/month, $79/year or $119 lifetime | Decimal calculator (unlimited), 5 lines per statement, 1 property | live |
| MineralAnswers | Plus $29/month; Pro $59/month; Premium $129/month | 2026-10-09 | |
| MineralTracker | Pro $99/month (reported in 2018 news; no public price page found) | 30-day trial (reported) | 2026-10-09 |
| MineralFile | from $500/month (tiers by gross monthly revenue, Capterra listing) | 2026-10-09 | |
| Valor royalty decimal calculator | free single-decimal calculator | yes | 2026-10-09 |
Why teams pick Decimoor
- Every step of the decimal is shown, so you can see where an operator's number differs.
- Statement lines are checked for maths, decimal, deductions and price against EIA benchmarks.
- Your properties and statements never leave your browser.
- One job done well for a fraction of portfolio-software prices.
How it works
- Enter the tract, your fraction, the royalty rate and the unit size; Decimoor shows each step.
- Type the decimal from your division order to see the difference.
- Add statement lines and see which ones are flagged and why.
FAQ
How is a royalty decimal interest calculated?
Royalty decimal = (net mineral acres ÷ gross tract acres) × royalty rate × (tract acres ÷ unit acres). In a pooled unit you add the decimals of each tract you own minerals in.
Why not MineralAnswers?
MineralAnswers is a full portfolio and regulatory-data service from $29/month (Plus) to $129/month (Premium), checked 9 Oct 2026. If you only need to check your decimal and your statements, Decimoor does that for $9/month or free for one property.
Where is my data stored?
In your browser only. Your properties, decimals and statements are never sent to our server; export a JSON backup any time.
Is this advice?
No. Decimoor is an information tool, not legal, tax, accounting or investment advice. Confirm your interest with your division order, lease and county records.