Reconcile two dry-feedstock carbon and nitrogen analyses with a laboratory-reported compost blend C:N ratio without assigning a universal recipe grade.
A quick decision brief for this specific tool
Two documented feedstock dry masses, matching dry-basis carbon and nitrogen analyses, and a laboratory blend C:N ratio
Calculated blend carbon and nitrogen mass, calculated C:N and signed laboratory-ratio difference
Reconciles one two-feedstock dry-basis batch record; it does not label a universal ideal recipe or certify the composting process
Choose your path
Reconcile two documented dry-feedstock carbon and nitrogen analyses with a laboratory-reported C:N ratio for the same compost blend.
Reproduce carbon mass, nitrogen mass and blend C:N from actual dry-basis analyses.
Enter both feedstock dry masses, matching lab C and N percentages, and the same-batch blend ratio.
Sees the signed laboratory difference without receiving a generic ideal grade.
Keep sampling, method, moisture conversion and batch identity attached.
Confirm the analyses and blend sample share compatible dry-matter and laboratory bases before comparing them.
Does not reconcile unlike samples or wet- and dry-basis values.
Avoid treating C:N arithmetic as proof the pile will compost safely or meet end-use rules.
Review moisture, porosity/aeration, temperature, pH, turning, odors, pathogens and end-use records separately.
Uses the result as one recipe record, not process approval.
Outputs and checklists are planning aids. Review the linked current authorities and the records, terms, instructions, and requirements that apply to your exact situation before a consequential decision.
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For each documented feedstock, multiply entered dry mass by its matching dry-basis carbon percentage and nitrogen percentage. Add the two carbon masses and the two nitrogen masses without inferring either element from C:N alone.
Divide calculated total carbon mass by calculated total nitrogen mass, then subtract the entered laboratory blend C:N ratio. The result reports the absolute difference and whether the calculation is above or below the laboratory record.
The arithmetic covers one two-feedstock dry-basis record. NRCS guidance also requires representative sampling and management of moisture, porosity, aeration, temperature, pH, turning, odors, pathogens and intended end use.
Updated: August 2026
An operator checks whether documented feedstock analyses reproduce the laboratory C:N result for the mixed batch.
A reviewer confirms that mass, carbon, nitrogen, moisture conversion, sampling date and batch identity share a compatible basis.
A facility retains the calculation as one recipe record while separately monitoring the biological process and end-use requirements.
Convert representative feedstock quantities to dry mass using documented moisture results before applying dry-basis laboratory percentages.
Treat it as one batch record. Moisture, carbon availability, porosity, aeration, temperature, pH, turning, safety and end use still control interpretation.
This worksheet reconciles measured dry-feedstock carbon and nitrogen records with a laboratory blend C:N result. It deliberately avoids reconstructing carbon from a ratio or issuing a universal Ideal status.
