A typical serving of chicken breast (1 chicken breast, 172 g) has about 284 calories. Per 100 g: 165 kcal, 31 g protein, 0 g carbs, 3.6 g fat. 3 oz (85 g) comes to 140 calories. Protein supplies most of that energy.
| Serving | Weight | Calories |
|---|---|---|
| 1 chicken breast | 172 g | 284 kcal |
| 3 oz | 85 g | 140 kcal |
| 1 cup, chopped | 140 g | 231 kcal |
| 100 g | 100 g | 165 kcal |
The dieter's default for a reason: 31 g of protein per 100 g and almost no fat. On the energy-density scale, 165 kcal per 100 g puts chicken breast at the moderate end. Protein density is strong: about 18.8 g of protein per 100 calories.
A typical serving (1 chicken breast, 172 g) has about 284 calories, and 100 g has 165 kcal. Calories scale with weight, so double the portion means double the number.
There are 31 g of protein in 100 g of chicken breast, which works out to about 53.3 g per serving (1 chicken breast). That is a genuinely high protein share for the calories.
Yes. Carbohydrate is 0 g per 100 g, effectively nothing, so almost all the calories come from protein and fat.
Every value on this page comes from USDA FoodData Central, entry 171477 (SR Legacy). Serving figures are converted from the per-100-g data, so rounding can shift a total by a calorie or two.
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Get JoulesA note on accuracy: calculators like this one provide estimates based on population-level formulas — your real needs vary with genetics, muscle mass, medical conditions, and more. Results are for information only and are not medical advice, a diagnosis, or a prescription. Talk to a doctor or registered dietitian before making significant changes to your diet or exercise, especially if you have a health condition, are pregnant, or are under 18.
Nutrition data: USDA FoodData Central, FDC ID 171477 (SR Legacy). Serving calories are computed from the per-100-g values.
