USDA Releases Updated Carbon Intensity Calculator
We finally have an updated calculator that incorporates manure and more details
USDA has released a user guide for the Feedstock Carbon Intensity Calculator (FD-CIC), the Excel tool tied to its final rule on regenerative agricultural biofuel feedstocks (7 CFR Part 2100). In plain terms: the tool produces a carbon intensity (CI) score — grams of CO2-equivalent per bushel — for your corn, soybeans, sorghum, or spring canola. That score is what determines whether your grain counts as a “reduced-CI feedstock,” which is increasingly what the biofuel and clean-fuel markets pay up for. Lower score, better position.
Here’s the practical rundown.
It’s a macro-enabled spreadsheet, and the macros matter. Save it to your desktop or documents folder, open it, and click “Enable Content.” To confirm it’s working, go to the “Crop Inputs” tab and change cell C5 to “2” — if a second input column appears, you’re good. If it doesn’t, you’ll need to turn on macros in Excel’s Trust Center before the tool will run. Everything you need happens on that one “Crop Inputs” tab.
You model one crop at a time. After picking the crop, you enter the number of “management units” — a field or group of fields under the same use and management. Each unit gets its own column, and the required cells are shaded pale yellow (pale blue cells are optional).
For each management unit, you’ll enter the state, county, acres, your actual average yield, your expected yield, and total synthetic N applied per acre. Watch the expected-yield definition: if you carry crop insurance on the crop, you use the yield that established your coverage. If you don’t, you use the transitional yield or the ARC county benchmark yield published by RMA or FSA.
Then you layer in the practices that lower your score: cover crops (including cover crop with grazing), reduced-till or no-till, the percentage of synthetic N treated with a nitrification inhibitor, and applied manure. Manure takes the most care — you enter the type, the amount per acre, and the N content from a manure test. Appendix 1 walks through reading that test, including converting dry-weight results back to an as-sampled basis and the unit conversions for solid versus liquid manure.
I calculated my potential score for my field in Buchanan County, Iowa. This first chart shows the result with all conventional practices:
