A cooked, skinless, boneless chicken breast contains about 165 calories per 3.5 ounces (100 grams). A whole cooked breast, which typically weighs around 172 grams, comes in at roughly 284 calories. The exact number shifts depending on the size of the breast, whether the skin is on, and how you cook it.
Calories by Serving Size
Chicken breasts vary quite a bit in size. A standard 3-ounce serving, the portion size you’ll see on most nutrition labels, has about 140 calories when cooked without skin. That’s roughly the size of a deck of cards. A full breast from the grocery store, though, often weighs closer to 272 grams raw (about 9.6 ounces), which shrinks during cooking as moisture evaporates. After cooking, that full breast lands in the 250 to 300 calorie range depending on how much it weighed to start.
If you’re tracking calories, weighing your chicken after cooking gives you the most accurate count. Raw weight and cooked weight can differ by 25% or more because of water loss, so a breast that looks large on the package may weigh considerably less on your plate.
Protein and Fat Breakdown
Chicken breast is one of the leanest protein sources available. A 3.5-ounce cooked serving delivers 31 grams of protein with only 3.6 grams of fat. A 3-ounce skinless breast has just 1 gram of saturated fat. That protein-to-calorie ratio is why chicken breast is a staple in meal plans built around weight loss or muscle gain.
For context, the same 3-ounce portion of skinless chicken thigh has 170 calories, 9 grams of total fat, and 3 grams of saturated fat. That’s 30 more calories and triple the fat compared to breast meat. Thighs taste richer precisely because of that extra fat, but if you’re choosing chicken primarily for its calorie efficiency, breast meat wins by a clear margin.
How Skin Changes the Count
Leaving the skin on adds a meaningful amount of fat and calories. Chicken skin is mostly fat, and it can increase the calorie content of a breast by 50 to 100 calories depending on the size of the piece. If you’re roasting a whole breast with the skin on for flavor and crispness, just know you’re adding roughly the calorie equivalent of a tablespoon of oil. Removing the skin before or after cooking is the simplest way to keep the numbers low.
How Cooking Method Matters
Plain chicken breast cooked without added fat, whether grilled, poached, roasted, or steamed, stays close to that 165 calories per 3.5-ounce baseline. The cooking method itself doesn’t significantly change the calorie content of the meat. What changes the count is what you cook it in.
Pan-frying in oil or butter can add 40 to 120 extra calories per breast depending on how much fat you use and how much the chicken absorbs. Breading and deep-frying roughly doubles the calorie count because the coating soaks up oil. A marinade made with olive oil, honey, or sugar-based sauces also adds calories that are easy to overlook.
If you want to keep things simple: grill, bake, or poach your chicken breast with seasoning and minimal oil, and you can reliably use 165 calories per 100 grams as your estimate.
Quick Calorie Reference
- 3 oz cooked, skinless: ~140 calories
- 3.5 oz (100 g) cooked, skinless: ~165 calories
- 1 whole breast (172 g) cooked, skinless: ~284 calories
- 3 oz chicken thigh, skinless: ~170 calories
These numbers assume no added oil, butter, or breading. For most people tracking their intake, rounding to 165 calories per 100 grams of plain cooked breast is a reliable rule of thumb that holds across grilling, baking, and steaming.