A grilled, skinless, boneless chicken breast contains approximately 165 calories per 100 grams (about 3.5 ounces) when cooked without added fats or sauces

. For a typical whole grilled chicken breast weighing around 172-180 grams (6 ounces), the calorie count is roughly 280 to 284 calories

. Calories increase if the chicken breast includes skin or is cooked with added oils, sauces, or breading. For example, a chicken breast with skin can have about 386 calories for a similar portion size due to higher fat content

. In summary:

• 100 g grilled skinless chicken breast: ~165 calories
• 6 oz (172-180 g) grilled skinless chicken breast: ~280-284 calories
• With skin, same size: ~386 calories

This makes grilled chicken breast a lean, high-protein, low-fat option for those monitoring calorie intake