Both can work. The key is to match the state of the food on the scale to the state named in its nutrition entry. Use a dry-rice entry for dry rice and a cooked-rice entry for cooked rice. A correct calorie value attached to the wrong weight can still give you a very misleading total.
- Raw weight needs a raw entry; cooked weight needs a matching cooked entry.
- Water absorbed or lost changes calories per gram, even when it adds no energy.
- There is no single conversion factor that works for every rice, pasta, cut of meat and cooking method.
- If you cooked the batch yourself, its measured before-and-after weights can help you divide portions.
Match the description before the number
The word after the food name matters. “Chicken breast, raw” and “chicken breast, roasted” describe different samples. So do “rice, dry” and “rice, cooked.” Before choosing grams in a tracker, check the whole entry, including preparation and any added fat.
If you are starting dinner from ingredients, weighing them before cooking can be convenient: the packet is still nearby, and the raw or dry amount is easy to record. If lunch is already cooked, use a suitable cooked-food entry instead. Reconstructing its earlier weight with a guessed multiplier is not automatically more accurate.
USDA FoodData Central's documentation also distinguishes edible portions from refuse. A bone-in weight should not silently become a weight of boneless meat; drained food should be matched to an entry or label that uses the same basis.
| What you weighed | What the entry should describe |
|---|---|
| Dry rice from the packet | The same type of rice, dry or uncooked |
| Plain cooked rice on a plate | The same type of rice, cooked without added fat |
| Raw boneless chicken breast | Raw breast with the same skin and edible-portion basis |
| Roasted chicken without its skin | Roasted meat without skin, weighed as eaten |
| A portion of a mixed homemade dish | Your batch's calculated calories and finished yield |
Why the calorie density changes
Rice and pasta take up water as they cook. Roasted foods often lose water. These changes alter the number of grams sharing the food's energy: adding water spreads that energy over more weight; losing water concentrates it into less.
That does not mean the total energy is always unchanged by cooking. Added oil brings energy in; discarded fat or cooking liquid can carry material out. The USDA cooking-yield documentation explicitly accounts for moisture and fat changes. “The weight changed” and “the calorie total changed” are different questions.
For logging, it is useful to keep two numbers separate: calories in the batch and calories per 100 g. The second can change substantially just because the amount of water changes.
Try the rice portion calculator ↓
Rice: one batch, two valid weights
Suppose your dry-rice label gives 360 kcal per 100 g. You cook 100 g in water, without oil, and end up with 300 g of cooked rice. These are illustrative numbers, not a universal rice yield; use the label and yield of your own batch.
For this simple example, treat the batch as retaining the dry rice's 360 kcal. A 150 g cooked serving is half the batch, so it has about 180 kcal. Its dry equivalent is 50 g.
Match the weight to the entry.
Use the dry equivalent
at 360 kcal / 100 g.
Use this batch’s density
at 120 kcal / 100 g.
Two matching entries.
The same portion of this batch.
The mismatch: entering 150 g as dry rice gives 540 kcal. The weight came from cooked rice; the entry did not.
The error would be entering 150 g under the dry-rice entry. That calculates 540 kcal, even though your plate holds only half of the batch. You have combined a cooked weight with a dry calorie density.
If you know your own batch, use its yield rather than forcing it to match a generic cooked-food entry. If you only have a cooked portion, an appropriate cooked entry is the practical estimate available to you.
Should you weigh pasta dry or cooked?
Dried pasta, fresh pasta and ready-cooked pasta already contain different amounts of water before you cook anything. Read whether the package gives nutrition for the product as sold or as prepared, and follow that basis. Do not assume every pasta label means “dry.”
For a shared pot, note the uncooked amount and weigh the drained cooked batch. Divide your cooked portion by that final weight to find your share. Record sauce, cheese and oil too; a plain-pasta entry does not describe the completed dish.
There is no dependable rule that all pasta or rice becomes exactly two or three times heavier. The USDA Food Buying Guide uses product-specific yield information. Your variety, cooking time and draining method matter to the weight on your scale.
Meat: shrinkage is not just a water calculation
With meat, some of the weight leaving the pan may be fat as well as water. The amount also depends on the cut and cooking process. USDA FSIS explains that ground-beef shrinkage varies with fat and moisture content, cooking temperature and cooking time.
If you weigh cooked meat, choose an entry that matches the cut, preparation, fat content and whether you eat the skin. Add cooking fats or sauces that the selected entry does not already include.
If you build a recipe from raw ingredients and keep all the juices in the dish, that is a different calculation from grilling meat and discarding drippings. A measured before-and-after weight tells you the yield; it cannot tell you the composition of everything left behind. Do not treat a guessed 25% weight loss as a measured calorie reduction.
A simple routine to repeat
- Choose the basis. Will you use the raw ingredients, a cooked-food entry, or your own whole-batch calculation?
- Match the entry. Check raw or cooked, drained or undrained, skin, bone and added fat.
- Weigh that same food state. Keep the container out of the measurement.
- Log your share once. Use the portion you ate, with additions that are not already included.
For soups, curries, casseroles and other mixed dishes, weighing the finished batch is usually more useful than trying to reverse each ingredient's cooking change from the finished plate. Our guide to counting calories in homemade meals walks through a complete example.
Common questions
Is raw weight always more accurate?
No. The match between the food, the measurement and the nutrition data matters more than a blanket rule. A well-matched cooked entry can be more useful for an already cooked portion than an invented raw equivalent.
What if I forgot to weigh the food before cooking?
Use the cooked amount and a suitable cooked entry. If you know the original ingredients and the whole finished batch, calculate your portion from those. If you know neither, make a reasonable estimate and avoid attaching false precision to it.
Do I use the drained weight on a can?
Use the basis the nutrition information actually describes. If it specifies drained food, weigh the drained portion. If you include the liquid in a recipe, choose data that accounts for what you used. The net package weight and the weight you eat need not match; check the serving information before calculating.
Does reheating change the calories?
Water lost during reheating can change the weight per portion without adding calories. New oil or toppings do add to the food. If a stored serving already has an assigned share of the original batch, a little evaporation does not require inventing a new meal total.
Where the guidance comes from
Label and food-composition guidance underpins the method. Worked examples are original, simplified calculations; their numbers are illustrative rather than measured meal data.
