A boneless, skinless chicken breast contains about 165 calories per 3.5 ounces (100 grams) when cooked. A more typical single serving of 3 ounces (85 grams) comes in at roughly 140 calories, making chicken breast one of the leanest protein sources you can buy.
Calories by Portion Size
The calorie count changes quite a bit depending on how much chicken you’re actually eating, and most grocery store chicken breasts are larger than a single serving. A standard raw chicken breast from the store often weighs between 6 and 8 ounces. Since meat shrinks about 25 percent during cooking (a pound of raw chicken yields roughly 12 ounces cooked), that 8-ounce raw breast becomes about 6 ounces on your plate.
Here’s a quick reference for cooked, boneless, skinless chicken breast:
- 3 ounces (85g): ~140 calories
- 3.5 ounces (100g): ~165 calories
- 6 ounces (170g): ~280 calories
- 8 ounces (227g): ~370 calories
If you’re tracking calories, weigh your chicken after cooking. Raw weight and cooked weight can throw your numbers off by 25 percent or more.
Protein, Fat, and Carbs
Chicken breast is almost entirely protein and a small amount of fat, with zero carbohydrates. A 3-ounce cooked serving delivers 26 grams of protein and just 2.7 grams of fat. That protein-to-calorie ratio is hard to beat: you’re getting roughly 18 grams of protein for every 100 calories.
Only about 1 gram of that fat is saturated. Keeping the skin off makes a significant difference here. Skin adds both calories and fat to any cut of chicken, so “boneless, skinless” is the version these numbers reflect.
Vitamins and Minerals
Beyond the macros, a single 3-ounce serving of chicken breast covers a surprising amount of your daily micronutrient needs. You get 36 percent of your daily selenium (important for thyroid function and immune health), 17 percent of your phosphorus, 16 percent of your vitamin B6, and 10 percent of your B12. The B vitamins play a central role in energy metabolism and red blood cell production, so chicken breast pulls double duty as both a protein source and a micronutrient source.
Chicken Breast vs. Thighs
Thighs are the most common alternative, and the calorie gap is real but not enormous. A 3-ounce skinless chicken thigh has about 170 calories compared to 140 for the same amount of breast. The bigger difference is in fat: thighs carry 9 grams of total fat and 3 grams of saturated fat per serving, roughly triple what you’d find in breast meat.
If you’re watching calories closely or limiting saturated fat, breast is the better pick. If you’re less concerned with those numbers and prefer the richer flavor and more forgiving texture of dark meat, thighs are still a solid protein source at only 30 extra calories per serving.
How Cooking Method Affects Calories
Plain grilled, baked, or poached chicken breast all land in that same 140-to-165 calorie range per serving. What changes the number is what you add. A tablespoon of olive oil for pan-searing adds about 120 calories. A butter baste pushes it even higher. Breading and frying can double the calorie count of a single breast.
For the most accurate tracking, count your cooking fats separately. The calorie figures for chicken breast assume no added oil, butter, or sauce. If you’re grilling with a light spray of oil or baking on parchment, the numbers stay very close to baseline. Marinades made with soy sauce, vinegar, or citrus add negligible calories, while those built on oil, honey, or sugar can add 50 to 100 calories depending on how much clings to the meat.
Raw vs. Cooked Weight
This is where most calorie-counting errors happen. Nutrition labels on raw chicken packages list the calories for raw weight, but you lose about a quarter of that weight to moisture loss during cooking. Four ounces of raw chicken becomes roughly 3 ounces cooked. If a recipe calls for “4 ounces of chicken” and doesn’t specify raw or cooked, you could easily be off by 40 to 50 calories per serving.
The simplest approach: pick one method and stick with it. If you weigh raw, use the raw nutrition data from the package. If you weigh cooked, use the USDA’s cooked values. Mixing raw weights with cooked calorie data (or vice versa) is the most common source of error.