What this calculator does
Crude protein from nitrogen works out estimates crude protein percentage from measured nitrogen content and a conversion factor. Enter your own figures above and the answer updates as you type: nothing is fixed in the code, so the result reflects exactly the numbers you supply.
The formula this calculator evaluates is printed under the tool and explained below, so you can check the working by hand or reuse it in a spreadsheet.
The formula
FormulaCP% = N% × factor, where factor is the nitrogen-to-protein conversion factor (6.25 general purpose, based on proteins averaging ~16% nitrogen)
The inputs explained
| Field | What to enter |
|---|---|
| Nitrogen content (%) | A number, measured in %. Starts at 2.5. |
| Conversion factor | Choose from 6.25 (general purpose), 5.4 (cereals/grains), 5.9 (fish/meat), 6.38 (milk/dairy). |
Worked examples
Every figure in the tables below is produced by this page’s own calculator at build time, so the numbers and the tool always agree. Select any row to load that scenario.
How the answer changes with nitrogen content
Every other input is held at the calculator’s starting values while nitrogen content varies. Select any row to load that scenario into the calculator.