Starbucks Butter Croissant contains 259 kcal per croissant — 13% of the adult 2,000 kcal daily reference intake, 17% for a child aged 7 to 10, and 20% for a child aged 4 to 6. At 259 kcal it is the lowest calorie pastry at Starbucks — below the Cheese Twist at 272 kcal, the All Butter Croissant at 287 kcal and the Pain au Chocolat at 297 kcal. The unfilled format with no sweet topping or filling keeps the calorie count lower than every other pastry option.

Per croissant: 259 kcal, 14g fat (9g saturated), 27g carbohydrate (5.4g sugar), 5.6g protein, 0.36g salt. The saturated fat at 9g is 45% of the adult daily guideline of 20g. The sugar at 5.4g is 18% of the adult daily free sugar limit of 30g. The salt at 0.36g is 6% of the adult daily limit of 6g — the lowest salt of any pastry at Starbucks.

Starbucks Butter Croissant contains 5.4g of sugar per croissant — 1.4 teaspoons and 18% of the adult daily free sugar limit of 30g. For a child aged 4 to 6, this uses 28% of their daily free sugar limit. At 5.4g it is the second lowest sugar of any pastry item at Starbucks after the Cheese Twist at 2.9g. The trace sugar comes from the small amount of sugar added to the laminated dough and the naturally occurring lactose in the butter — there is no sweet filling or icing to add sugar. The NHS free sugar limit is 30g per day for adults, 24g for children aged 7 to 10, and 19g for children aged 4 to 6.

Starbucks Butter Croissant contains 0.36g of salt per croissant — 6% of the adult daily limit of 6g and 12% of the daily limit for a child aged 4 to 6. This is the lowest salt of any pastry at Starbucks and among the lowest of any food item in the range. The trace salt comes from the butter laminated into the dough and the minimal salt used in the pastry dough itself. At 0.36g it is not a nutritional consideration relative to any age group's daily limit.

Starbucks Butter Croissant contains 9g of saturated fat per croissant — 45% of the adult daily guideline of 20g and 56% for a child aged 4 to 6. The saturated fat comes entirely from the butter laminated into the croissant dough — the classic French croissant technique folds butter repeatedly into the dough to create multiple thin pastry layers. A standard croissant uses approximately 23-25% butter by flour weight. Despite being the lowest calorie pastry at Starbucks, the saturated fat at 9g is a significant proportion of the daily guideline due to the butter-intensive lamination process.

Starbucks Butter Croissant contains 5.6g of protein per croissant — 11% of the adult daily reference intake of 50g. The protein comes from the flour and eggs in the croissant dough. At 5.6g for 259 kcal the protein-to-calorie ratio is low and typical of a plain butter pastry with no protein-rich filling. This is lower than the Cheese Twist at 7.8g and the Almond Croissant at 10g, both of which have protein-rich fillings.

Yes. NOVA 4, ultra-processed. The croissant dough contains rapeseed lecithin as an emulsifier — a plant-based lecithin used as a dough conditioner — and ascorbic acid as a flour treatment agent. These industrial additives improve dough strength and shelf life beyond what a traditionally made croissant would achieve. Despite appearing as one of the simpler items in the Starbucks pastry range, the commercial production requirement for consistent shelf-stable croissants necessitates these processing additives.

Starbucks Butter Croissant contains wheat/gluten, milk and egg as declared allergens — just three, one of the simplest allergen profiles of any pastry item at Starbucks. Notably it does not contain soya — unlike the Chocolate Twist and Pain au Chocolat which both introduce soya through chocolate, the plain Butter Croissant uses rapeseed lecithin rather than soya lecithin as its emulsifier. The wheat comes from the flour in the dough. The milk comes from the butter. The egg comes from the eggs in the dough and the egg wash on the exterior. It does not contain peanuts, tree nuts, fish, shellfish, celery, mustard, sesame, lupin, molluscs, sulphites or soya. Always tell your barista if you have a severe allergy before ordering.

Yes. Starbucks Butter Croissant is suitable for vegetarians. It contains no meat or fish. It is not suitable for vegans as it contains butter and eggs. With only three declared allergens — wheat, milk and egg — and no soya or tree nuts, it has one of the simplest allergen profiles in the entire Starbucks range. The use of rapeseed lecithin rather than soya lecithin as the emulsifier is the reason soya is not declared.

At 5.4g of sugar — 28% of the daily free sugar limit for a child aged 4 to 6 — the Butter Croissant is one of the most appropriate pastry options for children at Starbucks on sugar grounds. The 9g saturated fat uses 56% of their daily guideline, which is the primary nutritional consideration. Salt at 0.36g uses just 12% of their daily limit — the lowest of any pastry. Three allergens with no soya or tree nuts. For vegetarian children who can eat wheat, milk and egg, the Butter Croissant is the most sugar-appropriate pastry option at Starbucks after the Cheese Twist.

Starbucks Butter Croissant uses rapeseed lecithin as its emulsifier rather than the soya lecithin found in most other pastries and chocolate-containing items at Starbucks. Rapeseed lecithin is sourced from rapeseed oil rather than soya beans, and performs the same dough-conditioning function without introducing a soya allergen. The practical consequence for consumers is that the Butter Croissant does not declare soya as an allergen, unlike the Chocolate Twist, Pain au Chocolat and most other pastries at Starbucks. For those managing a soya allergy while being able to tolerate wheat, milk and egg, the Butter Croissant is one of the few pastry options at Starbucks without a soya declaration.

At just 5.4g of sugar the Butter Croissant leaves nearly the full adult daily free sugar allowance of 30g available for a drink. A plain Cappuccino or Flat White adds 9-12g from milk, keeping the combined total at 14.4-17.4g — well within the adult daily limit. A Caramel Macchiato adds 23g, bringing the total to 28.4g — just within the adult daily limit. Even a Grande Chai Tea Latte at 28g keeps the total at 33.4g — only slightly over. A Grande Caramel Frappuccino at 48g takes the total to 53.4g. The Butter Croissant is one of the few sweet pastry items at Starbucks where a moderately sweetened drink such as a Caramel Macchiato can be ordered alongside it without definitively exceeding the adult daily free sugar limit.

The Butter Croissant contains 259 kcal versus 287 kcal in the All Butter Croissant — 28 fewer calories. Sugar is lower at 5.4g versus 5.8g — minimal difference. Saturated fat is lower at 9g versus 10g. Both have three allergens — wheat, milk and egg — with no soya or tree nuts. The All Butter Croissant is described as all-butter in its name and is slightly larger, accounting for the higher calorie and saturated fat figures. For the lowest calorie, lowest saturated fat and lowest salt croissant at Starbucks, the Butter Croissant is the better choice. The nutritional difference is modest — the All Butter Croissant is essentially the same item at a slightly larger portion size.

Starbucks Butter Croissant is the lowest calorie pastry at Starbucks at 259 kcal and among the lowest sugar at 5.4g. The lowest salt of any pastry at 0.36g. Three declared allergens — wheat, milk and egg — with no soya or tree nuts, achieved through the use of rapeseed rather than soya lecithin as the emulsifier. It is suitable for vegetarians but not vegans. For those seeking the most calorie-efficient, lowest sugar and simplest allergen profile pastry option at Starbucks, the Butter Croissant is the standout choice alongside the Cheese Twist. The 9g saturated fat from the butter-laminated dough is the primary nutritional consideration — unavoidable in any traditionally laminated croissant.