The number of calories in a chicken breast varies depending on whether it is raw or cooked and its size:

• A 100-gram (3.5 oz) serving of cooked, skinless, boneless chicken breast contains about 165 calories

• A 100-gram serving of raw, skinless chicken breast contains approximately 120-124 calories due to water content loss during cooking

• A typical single cooked chicken breast (around 172 grams) has about 284 calories

• A 4-ounce (about 113 grams) cooked chicken breast has roughly 186 calories , while raw it would be closer to 126 calories

Calories increase if the chicken breast is cooked with added oils, sauces, or with the skin on. Skinless chicken breast is lean and high in protein, making it a popular choice for a low-calorie, high-protein diet

. In summary, for plain, cooked, skinless chicken breast:

• 100 g = ~165 calories
• 4 oz (113 g) = ~186 calories
• One average breast (172 g) = ~284 calories

Raw chicken breast has fewer calories per 100 g due to water weight