Add the ingredient estimates for the whole recipe, then multiply by the fraction of the finished batch you ate. Keep raw and cooked measurements on the correct basis.
Build an ingredient record before dividing portions
List every ingredient that contributes to the finished dish, including oil, sauce and toppings. Use the label or a suitable food-composition entry for the amount you added. Write down whether each amount is raw, dry or cooked so that you do not accidentally combine different measurement bases.
The FDA serving-size guidance is useful here: label numbers relate to a specified quantity. If the ingredient amount in your recipe is different, scale the label values to match. Measuring an ingredient does not remove all uncertainty, but it gives you a clearer basis than estimating an entire mixed dish from its appearance.
Use this reusable recipe worksheet
| Field | What to record | Why it helps |
|---|---|---|
| Ingredient and brand | The exact product or food entry | Makes the recipe repeatable |
| Amount added | Grams, milliliters or labeled servings | Keeps the calculation on one basis |
| Energy and macros | Values for the amount added | Provides the batch totals |
| Finished batch | Total cooked weight or equal portions | Lets you divide the batch |
| Your serving | Weight eaten or fraction of the batch | Connects the recipe to your meal |
Keep the worksheet with the recipe name and date. If you change the oil, meat, sauce or portion size next time, update that version rather than assuming the previous total still applies.
Calculate a portion from the finished batch
Suppose your ingredient record totals 1,800 calories and the finished food weighs 1,200 grams. A 300-gram serving is one quarter of the batch:
1,800 × (300 ÷ 1,200) = 450 calories
The figures are invented to show the method. Apply the same fraction to your batch protein, carbohydrate and fat estimates. If you divide the dish into four genuinely equal portions instead, divide each batch total by four.
This method assumes the ingredients are distributed reasonably evenly. A serving with most of the cheese or protein will differ from one containing mainly broth or vegetables. For separate meal components, calculate each component and then combine your portions.
Handle cooking changes and leftovers
Water gained or lost during cooking changes the weight of a food. Use a food entry that matches the state you measured: dry rice with a dry-rice entry, for example, rather than treating a cooked weight as a dry weight.
If you use finished batch weight for portioning, keep the original ingredient calculation and divide by that finished weight. Avoid calculating the same ingredient once as dry and again as cooked. When you discard part of a preparation, the assumption that every ingredient remains in the final dish may also need adjustment.
For leftovers, record the amount eaten on each occasion. Do not log the full recipe again whenever you photograph a new serving.
Combine the recipe with a photo
Photograph your serving and use NutriLens when a quick meal estimate is useful. Its recipe analyzer can also estimate a described recipe, but specific quantities still matter. Compare AI output with the ingredient record you prepared rather than treating the two as independent measurements that must agree.
Over time, a small collection of your recurring meals can make home-food tracking less repetitive. Give each recipe a clear name, record changes and keep the portion method consistent.
Common questions
Do I divide by raw weight or cooked weight?
Match each food entry to the state of the ingredient you measured. For portioning a completed batch, use the finished batch weight and the weight of your serving on the same basis.
Can I divide the recipe by the number of servings?
Yes, when those servings contain roughly equal portions of the ingredients. Otherwise, use weights or calculate uneven components separately.
References and further reading
Published by Moocsoft, the independent studio behind NutriLens. Examples and worksheets are illustrative. App features can vary by platform and version; see the store listing for current availability and in-app purchases.