Calories in
cereals ready-to-eat, post, grape-nuts cereal
361 kcal per 100 g Cereals ready-to-eat, POST, GRAPE-NUTS Cereal contains 361 calories per 100 grams, or about 209 calories per 0.5 cup. Per 100 g it provides 11.2 g protein, 80.5 g carbohydrate and 1.8 g fat.
By calories that splits 84% carbohydrate, 12% protein, 4% fat — dissected below.
SOURCE·USDA SR Legacy·FDC 171647·REVIEWED JUL 2026
The 4·4·9 shorthand adds to 383 kcal; USDA publishes 361 kcal — +22 kcal, 6.1% apart. That gap is expected, not an error: USDA derives energy with food-specific factors and, for many items, discounts the fibre that the shorthand still counts at four. The published figure is the better one, so the axis above is scaled to it and the shares are what the shorthand is genuinely good at.
Source—USDA FoodData Central, SR Legacy—FDC 171647—retrieved 2026-07
How this is worked out
- USDA measures every nutrient per 100 g of edible portion. That row is published here unchanged — nothing is rounded up, smoothed or "adjusted".
- The energy figure is USDA's own, derived with food-specific factors. This site never computes the calorie count it publishes.
- The Atwater shorthand 4 · 4 · 9 is applied to the protein, carbohydrate and fat grams only to split that energy into shares — and where the shorthand disagrees with the published figure, the gap is printed rather than hidden.
- A serving is a straight proportional conversion of the per-100 g row, using USDA's own household measures for the grams.
- The walking figure uses MET 4.0 at 70 kg, the same equation the sister site publishes.
per serving = per 100 g × serving grams ÷ 100 energy shares = 4·P + 4·C + 9·F (P, C, F in grams) walk minutes = kcal ÷ (4.0 × 3.5 × 70 ÷ 200)
Calories in a typical serving
Per-100 g figures are useful for comparison but nobody eats 100 g of anything on purpose. These are the USDA's own household measures.
| Serving | Grams | Calories | Protein | Carbs | Fat |
|---|---|---|---|---|---|
| 0.5 cup | 58.0 g | 209 | 6.5 g | 46.7 g | 1.0 g |
SOURCE·USDA SR Legacy·REVIEWED JUL 2026
Full nutrition, per 100 g and per 0.5 cup
| Nutrient | Per 100 g | Per 0.5 cup |
|---|---|---|
| Energy | 361 kcal | 209 kcal |
| Protein | 11.2 g | 6.5 g |
| Total fat | 1.8 g | 1.0 g |
| Saturated fat | 0.3 g | 0.2 g |
| Carbohydrate | 80.5 g | 46.7 g |
| Fibre | 13.0 g | 7.5 g |
| Sugars | 8.9 g | 5.1 g |
| Sodium | 465.0 mg | 269.7 mg |
| Potassium | 400.0 mg | 232.0 mg |
| Calcium | 32.0 mg | 18.6 mg |
| Iron | 28.0 mg | 16.2 mg |
| Vitamin C | 0.1 mg | 0.1 mg |
| Vitamin A | 0.0 µg | 0.0 µg |
| Cholesterol | 0.0 mg | 0.0 mg |
| Water | 3.5 g | 2.0 g |
A dash means the nutrient was not measured for this item, which is not the same as zero.
SOURCE·USDA SR Legacy·FDC 171647·REVIEWED JUL 2026
How cereals ready-to-eat, post, grape-nuts cereal compares
Among the 48 breakfast cereals items on this site, cereals ready-to-eat, post, grape-nuts cereal ranks 39 of 48 by calorie density, against a category average of 376 kcal per 100 g — so it is about 4% less calorie-dense than typical for its group.
It carries 3.1 g of protein per 100 calories, so it is not a meaningful protein source.
To burn off 0.5 cup (209 kcal), a 70 kg adult would walk for roughly 43 minutes — see the walking calculation on our sister site, or pick a different activity. Treat that as a sense of scale rather than a rule: eating and moving are not a simple ledger.
SOURCE·USDA SR Legacy·REVIEWED JUL 2026
A reference table describes the average cereals ready-to-eat, post, grape-nuts cereal. Yours was grown somewhere, picked at some ripeness, and cooked by you.
Questions this entry settles
How many calories are in cereals ready-to-eat, post, grape-nuts cereal?
Cereals ready-to-eat, POST, GRAPE-NUTS Cereal contains 361 calories per 100 g, which works out to about 209 calories per 0.5 cup. It also provides 11.2 g of protein, 80.5 g of carbohydrate and 1.8 g of fat per 100 g.
What is the macro breakdown of cereals ready-to-eat, post, grape-nuts cereal?
By calories, cereals ready-to-eat, post, grape-nuts cereal is roughly 84% carbohydrate, 12% protein and 4% fat. That makes it a predominantly carbohydrate-based food.
How long does it take to burn off 0.5 cup?
About 43 minutes of ordinary walking for a 70 kg adult (MET 4.0). That is a rough guide for scale, not a prescription — appetite and activity interact in ways a simple subtraction does not capture.
Is this figure exact for the cereals ready-to-eat, post, grape-nuts cereal I bought?
No. These are USDA reference values, averaged across samples. Real foods vary with variety, ripeness, growing conditions, cut, brand and how they were cooked — 10–20% either way is normal. Use them for planning, not precision.
Neighbouring entries
The 6 foods that sit closest to cereals ready-to-eat, post, grape-nuts cereal on the calorie-density shelf, all within breakfast cereals.
Source: USDA FoodData Central, SR Legacy — public domain, reviewed JUL 2026. Full USDA description: "Cereals ready-to-eat, POST, GRAPE-NUTS Cereal". General information only — not medical or nutrition advice. Values are averages for a food type and vary by brand, ripeness and preparation.
