Chicken Breast — calories & nutrition
By Jenny Updated
Chicken breast is the ultimate lean protein — low in fat, high in protein, genuinely filling, and endlessly versatile. Whether you're grilling it for a weeknight salad, poaching it for a creamy pasta sauce, or slicing it into a stir-fry, skinless chicken breast is the backbone of healthy cooking in millions of British households — and for very good reason.
At around 110 calories per 100g raw and just 1.7g of fat, skinless chicken breast is one of the lowest-fat protein sources you can eat. Compare that to a sirloin steak (207 kcal per 100g) or even salmon (208 kcal per 100g) and you start to understand why dieticians, personal trainers, and weight loss plans alike keep coming back to it. The protein content is exceptional — around 23g per 100g raw — which means it keeps you full and helps preserve muscle while you're in a calorie deficit.
The way you cook chicken breast makes a significant difference to the final calorie count. Grilled or baked without added fat, a 100g cooked portion is around 165 kcal. Pan-fry it in a tablespoon of olive oil and you're adding 100+ calories before the food is even on your plate. The good news is that chicken breast is so naturally tender when cooked correctly that it doesn't need fat — marinate it in lemon juice, garlic and herbs, and grill or oven-cook until just done.
Portion sizes vary considerably between supermarkets and suppliers. A small chicken breast from a budget range might weigh 150g raw, while a large breast from a higher-welfare range could easily hit 220–250g. If you're calorie-counting carefully, weighing raw is more accurate than relying on finished weight, as water is lost during cooking.
For the best results when cooking chicken breast, don't overcook it — this is where people go wrong. An overcooked breast becomes dry and unpleasant, which makes it feel less satisfying. Aim for an internal temperature of 74°C and then rest it for five minutes covered in foil. Sliced properly, a well-cooked chicken breast is juicy, tender, and genuinely enjoyable — not diet food, just good food.
Chicken Breast nutrition breakdown
| Portion | Calories | Carbs (g) | Fat (g) | Protein (g) | Fibre (g) |
|---|---|---|---|---|---|
| 100g raw, skinless | 110 | 0 | 1.7 | 23 | 0 |
| 100g grilled/cooked, skinless | 165 | 0 | 3.6 | 31 | 0 |
| 1 small breast (150g raw) | 165 | 0 | 2.6 | 34 | 0 |
| 1 medium breast (175g raw) | 193 | 0 | 3 | 40 | 0 |
| 1 large breast (200g raw) | 220 | 0 | 3.4 | 46 | 0 |
How Chicken Breast compares
Calories per 100g
Chicken Breast and weight loss
Chicken breast is consistently ranked as one of the most effective proteins for weight loss, and the science backs this up. High-protein foods like chicken breast increase satiety hormones and reduce ghrelin (the hunger hormone), meaning you feel full sooner and stay satisfied longer after eating.
Studies have shown that dietary protein increases the thermic effect of food — the energy your body uses to digest it — meaning chicken breast actually burns slightly more calories to process than an equivalent weight of carbohydrates or fat. On Slimming World, skinless chicken breast is a Free Food, meaning you can eat it without any Syn counting or portion restrictions.
The plan's philosophy is that lean proteins like chicken breast are so filling and nutritious that they naturally regulate your intake without needing to be measured. This is one of the most appealing aspects of the SW approach — rather than eating a tiny weighed portion of chicken on a bed of leaves, you can have a generous, satisfying amount alongside your Free Food carbs and Speed vegetables and still lose weight consistently.
Slimming World status
Chicken Breast is a Free Food — no weighing, no synning. It is not a Speed Food, so it doesn't count toward your ⅓ Speed target at meals.
FAQs
How many calories are in a chicken breast?
A medium skinless chicken breast (around 175g raw) contains approximately 193 calories. A small breast (150g raw) is around 165 kcal and a large breast (200g raw) is around 220 kcal. Once cooked, the calorie content per 100g rises slightly (to around 165 kcal) as water is lost during cooking.
Is chicken breast a Free Food on Slimming World?
Yes — skinless chicken breast is a Free Food on Slimming World. You can eat it without weighing or counting Syns as part of your Food Optimising day. Note that chicken with skin attached is not Free, as the skin contains significantly more fat and calories.
What is the best way to cook chicken breast on Slimming World?
Grilling, baking, poaching, and air-frying are all ideal SW cooking methods for chicken breast as they require little or no added fat. Avoid frying in oil. For maximum flavour with zero Syns, marinate in lemon juice, garlic, paprika and dried herbs before grilling or baking at 200°C for 20–25 minutes (depending on size).
Chicken thigh vs chicken breast: which has fewer calories?
Skinless chicken breast is lower in calories and fat than skinless chicken thigh. A 100g cooked chicken breast is around 165 kcal with 3.6g fat, while a 100g cooked skinless chicken thigh is around 177 kcal with 7g fat. Both are Free on Slimming World, so the choice comes down to preference — thighs are more forgiving to cook and have a richer flavour.
More calorie guides
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