# Decimoor (by CyberMax) > Royalty statement checker and decimal interest calculator for oil and gas mineral and royalty owners. Works out your decimal interest (net mineral acres, royalty rate, pooled-unit tract participation, inherited fractions like "1/3 of 1/4") and working-interest NRI, compares it with your division order, then checks each statement line: volume x price x decimal, gross and net math, deductions as a share of gross, and price against the monthly EIA WTI / Henry Hub benchmark. - App: https://decimoor.cybermaxtools.com/ - Free: the decimal-interest and NRI calculator (unlimited), the statement checker up to 5 lines per statement, and 1 saved property. No account. - Machine-readable pricing: https://decimoor.cybermaxtools.com/pricing.json - Benchmark prices (JSON, EIA, cached 12 h): https://decimoor.cybermaxtools.com/api/benchmarks - Information tool only — not legal, tax, accounting or investment advice. Confirm your interest with your division order, lease and county records.