Costa is one of those places you probably pop into more than you realise — a mid-shopping pick-me-up, a catch-up with a mate, or just because you walked past and the smell of coffee pulled you in. The good news? Most Costa drinks can be made Slimming World friendly with a couple of tweaks.
We've counted the syn values for Costa's full menu — every drink, cake, sandwich and snack — so you know exactly what you're ordering.
Before we get into specific drinks, this is the single most important thing to understand about Costa on Slimming World: your milk choice changes everything.
| Milk Type | Syns per 100ml | Impact on a Medium Latte |
|---|---|---|
| Skimmed Milk | Syn-free (HEa) | ~2 syns |
| Semi-Skimmed Milk | 0.5 | ~4 syns |
| Whole Milk | 1 | ~6 syns |
| Oat Milk | 0.5-1 | ~5 syns |
| Soya Milk | 0.5 | ~3.5 syns |
| Coconut Milk | 0.5 | ~3 syns |
Golden rule: Always ask for skimmed milk. It's available at every Costa and can save you 2-4 syns per drink. That adds up fast if you're a daily coffee drinker.
All values are for a medium (medio) size with semi-skimmed milk unless otherwise stated. Adjust up or down based on the milk table above.
| Hot Drink | Syns (Semi-Skimmed, Medium) |
|---|---|
| Americano (black) | Free |
| Americano (splash of milk) | 0.5 |
| Latte | 4 |
| Cappuccino | 3 |
| Flat White | 3.5 |
| Cortado | 1.5 |
| Mocha | 7 |
| Hot Chocolate | 8 |
| Hot Chocolate with Cream & Marshmallows | 12 |
| Chai Latte | 7 |
| Matcha Latte | 5 |
| English Breakfast Tea (no sugar) | Free |
| Green Tea | Free |
| Herbal Tea (any flavour) | Free |
| Tea with Semi-Skimmed Milk | 0.5 |
| Espresso (single) | Free |
| Espresso (double) | Free |
Best picks: Americano, any tea, or a cappuccino with skimmed milk (drops to about 2 syns). A flat white with skimmed is around 2.5 syns — lovely.
Worst pick: Hot chocolate with cream and marshmallows at 12 syns. That's a dessert, not a drink.
Costa offers vanilla, caramel, hazelnut, and gingerbread syrups. Each pump adds approximately 1-1.5 syns. A sugar-free syrup (ask the barista) adds 0 syns — always worth asking for.
| Cold Drink | Syns |
|---|---|
| Iced Americano (black) | Free |
| Iced Latte (semi-skimmed) | 3.5 |
| Iced Cappuccino | 3 |
| Iced Mocha | 7 |
| Costa Frostino — Coffee | 9 |
| Costa Frostino — Chocolate | 11 |
| Costa Frostino — Strawberry | 10 |
| Fruit Cooler — Mango & Passion Fruit | 6 |
| Fruit Cooler — Peach | 5.5 |
| Lemonade | 4 |
| Orange Juice | 4 |
| Apple Juice | 3.5 |
| Water (still or sparkling) | Free |
Frostinos are basically milkshakes — treat them as desserts. An iced Americano in summer is your best bet at zero syns.
For more ideas, see our complete low-syn drinks guide.
Right, this is the danger zone. Costa's cake display is gorgeous but absolutely brutal on syns. Here's the honest truth.
| Cake / Pastry | Syns |
|---|---|
| Chocolate Brownie | 13 |
| Millionaire's Shortbread | 14 |
| Carrot Cake | 14 |
| Victoria Sponge | 12 |
| Lemon Drizzle Cake | 11 |
| Rocky Road | 12 |
| Chocolate Muffin | 15 |
| Blueberry Muffin | 13 |
| Croissant (plain) | 9 |
| Pain au Chocolat | 11 |
| Almond Croissant | 14 |
| Fruit Toast (single slice) | 5 |
| Belgian Waffle | 10 |
| Cookie — Chocolate Chunk | 11 |
| Cookie — Double Chocolate | 12 |
| Shortbread | 7 |
Lowest syn option: Fruit toast at 5 syns. It's one of the only things in the cabinet under 10 syns.
Our advice: If you're going to treat yourself to cake, plan for it. Save your syns, enjoy every bite, and don't feel guilty about it. Just don't make it a daily habit.
For more sweet treats that won't blow your plan, check our low-syn snacks guide and low-syn chocolates guide.
| Sandwich / Panini | Syns |
|---|---|
| Ham & Cheese Toastie | 11 |
| Cheese & Tomato Toastie | 10 |
| Chicken & Bacon Panini | 12 |
| Tuna Melt Panini | 13 |
| BBQ Chicken Panini | 11 |
| British Ham & Mustard Sandwich | 9 |
| Chicken & Stuffing Sandwich | 11 |
| Egg & Cress Sandwich | 8 |
| BLT Sandwich | 10 |
| Veggie Wrap | 9 |
Best pick: The Egg & Cress sandwich at 8 syns is the lowest option in the food counter. The British Ham & Mustard at 9 syns is also a solid choice.
| Breakfast Item | Syns |
|---|---|
| Bacon Roll | 8 |
| Sausage Roll | 10 |
| Bacon & Egg Roll | 9 |
| Porridge (plain) | 4 |
| Porridge with Honey | 6 |
| Fruit Toast (2 slices) | 10 |
| Yoghurt & Granola Pot | 7 |
| Egg & Spinach Protein Box | 6 |
Best breakfast: Plain porridge at 4 syns with a black Americano. Filling, warming, and barely dents your daily allowance.
Here are three orders for different occasions:
A medium Costa latte made with semi-skimmed milk is around 4 syns. Switch to skimmed milk and it drops to about 2 syns. A large with whole milk can be as much as 6 syns.
An Americano with a splash of skimmed milk is practically free at just 0.5 syns. Black coffee and all teas without sugar are completely syn-free.
A medium Costa hot chocolate with semi-skimmed milk is approximately 8 syns. The large with whipped cream and marshmallows can hit 12+ syns. Ask for skimmed milk and skip the toppings to save syns.
Most Costa cakes and pastries range from 10-15 syns per slice. The lowest option is usually the fruit toast at around 5 syns per slice. It's best to save these for a planned treat day.
Yes, significantly. Skimmed milk is lowest in syns, followed by semi-skimmed, then whole milk. Oat milk sits between semi-skimmed and whole. Switching from whole to skimmed in a latte can save 2-4 syns.
Costa toasties and paninis typically range from 8-13 syns depending on the filling. Cheese-heavy options are at the higher end. The egg and cress sandwich at 8 syns is the lightest option.
We've counted the syns in hundreds of foods and drinks:
Related Articles
