Each ingredient’s weight is multiplied by its USDA FoodData Central values per 100 g. The whole recipe is added up and divided by 4. Raw weights are used for meat, fish and vegetables; beans and lentils are drained weights. All of the oil is counted as eaten. Added salt is not included; sodium from stock, bread, cheese and tinned food is.
Calculation, whole recipe| Ingredient | Weight used | Source | Energy | Protein |
|---|
| lean beef mince | 500 g | FDC 173110Beef, ground, 93% lean meat / 7% fat, raw | 760 kcal | 104.3 g |
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| dried breadcrumbs | 40 g | FDC 174928Bread, crumbs, dry, grated, plain | 158 kcal | 5.3 g |
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| eggs | 56 g | FDC 171287Egg, whole, raw, fresh | 80 kcal | 7.0 g |
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| Parmesan | 20 g | FDC 170848Cheese, parmesan, hard | 78 kcal | 7.2 g |
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| garlic | 15 g | FDC 169230Garlic, raw | 22 kcal | 1.0 g |
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| dried oregano | 1.5 g | FDC 171328Spices, oregano, dried | 4 kcal | 0.1 g |
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| olive oil | 9 g | FDC 171413Oil, olive, salad or cooking | 80 kcal | 0.0 g |
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| passata | 500 g | FDC 170460Tomato products, canned, puree, without salt addedCalculated with FoodData Central's unsalted tinned tomato purée record, the closest match to sieved passata. | 190 kcal | 8.3 g |
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| spinach | 200 g | FDC 168462Spinach, raw | 46 kcal | 5.7 g |
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| mozzarella | 125 g | FDC 170847Cheese, mozzarella, part skim milk | 318 kcal | 30.3 g |
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| fresh basil | 15 g | FDC 172232Basil, fresh | 3 kcal | 0.5 g |
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| sourdough bread | 160 g | FDC 172675Bread, french or vienna (includes sourdough)Calculated with FoodData Central's French or Vienna bread record, which it states includes sourdough. | 435 kcal | 17.2 g |
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| Whole recipe | | Divided by 4 | 2175 kcal | 186.8 g |
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Per serving the energy is rounded to the nearest 5 kcal, grams to the nearest whole gram and sodium to the nearest 10 mg. Calculation method 1.0, September 2026. How the calculation works.