In this article (6 sections)
Weigh food raw or cooked, but match the nutrition entry to that state. A raw chicken weight and a cooked chicken weight cannot be interchanged. The same applies to dry and cooked rice or pasta.
This guide covers meat, mixed meals and weighed recipe portions. For the historical FRIDA pasta-and-rice examples, see raw or cooked food, which focuses on choosing a dry or cooked grain entry.
Why does cooking change calories per 100 grams?
Water has no calories. Pasta and rice generally absorb water; meat often loses water during cooking. A different final weight changes the concentration of energy per 100 g.
Water is not the only change. Fat and juices can leave meat, solids can enter discarded cooking water, and sauces or oil can add energy. It is too strong to say all foods retain exactly the same total calories after cooking.
| Generic USDA example | Raw or dry, per 100 g | Cooked, per 100 g |
|---|---|---|
| Pasta, dry versus boiled | 371 kcal | 157 kcal |
| White rice, dry versus cooked | 365 kcal | 130 kcal |
| Chicken breast, raw versus roasted | 120 kcal | 165 kcal |
These rounded USDA FoodData Central examples describe separate food records. Their ratios do not measure the cooking yield of a particular batch. Match cut, skin, preparation and additions as well as raw or cooked state.
How much can the wrong state change an entry?
For a hypothetical plate with 250 g cooked rice and 150 g roasted chicken:
- Rice at 130 kcal/100 g: 325 kcal.
- Chicken at 165 kcal/100 g: 247.5 kcal.
- Combined total before sauces or oil: about 573 kcal.
Using the dry rice value of 365 kcal/100 g for that same cooked rice weight would record 912.5 kcal for the rice alone. That is a lookup error, not evidence that cooking added energy.
For US portions, 100 g is about 3.5 oz by weight. A cup is a volume measure and cannot replace a gram amount without an appropriate food-specific serving weight.
How do you calculate portions from a cooked batch?
Here is an illustrative batch calculation, not a measured USDA cooking yield:
- Weigh 100 g dry pasta and use the package value, assumed here to be 371 kcal.
- Cook and drain it, then measure the finished pasta. Suppose it weighs 250 g.
- A 125 g serving is half that measured batch, so allocate half the starting energy: about 186 kcal.
- Include sauce, oil or other additions separately. Account for discarded ingredients where meaningful; losses to cooking water make this a practical estimate rather than an exact laboratory result.
For a mixed dish, add the ingredients first and divide by the final dish weight or defined portions. See calculating calories in food.
What if you only have the cooked chicken weight?
Select a cooked entry that matches the cut, skin and cooking method. Do not invent a raw weight by assuming every chicken breast loses the same percentage. A breaded or fried item also needs a suitable record or recipe rather than a plain roasted-chicken entry.
If weighing raw for a recipe, make sure you are allocating the edible amount and accounting for bones, skin or drippings that are not eaten. A database record cannot determine those details from the food name alone.
What does the package label describe?
Check whether it says as sold, prepared or drained. Many dry grain labels describe the dry product, but some give prepared information too. The FDA's serving-size explanation helps distinguish a label serving from the portion actually eaten.
In Calorie.one, review the preparation state and amount before saving. Context can suggest a cooked or dry entry, but it can be misinterpreted; a database match does not validate that choice.
Frequently asked questions
How much does 100 g of dry rice weigh cooked?
There is no universal conversion. Rice type, water, cooking and draining change yield. Weigh your finished batch or use a suitable cooked entry for the portion weighed.
How much weight does chicken lose when cooked?
It varies with cut and method. Separate raw and roasted calorie values cannot establish a shrinkage percentage for your chicken.
Does cooking add calories?
Water does not add energy, but oil, butter, sauces or other ingredients do. Discarded solids, juices and fat can also change the amount retained. Match the actual preparation rather than relying on a blanket rule.