When you’re counting your calories, finding out exactly how many calories are in a slice of bread can be a tricky business.
Many variables include loaf size, added ingredients, slice thickness, and how dense the bread is, so it can be impossible to pin down an exact figure.
To make things easy for you, I’ve put together average calorie values per weight and bread thickness along with calories per slice for many well-known brands which are available to buy in the UK.
Calories in a slice of shop-bought bread can range from around 45kcal for a low-calorie loaf up to 160kcal for a thick-cut bloomer. Calories per slice are heavily dependent on the loaf size and slice thickness.
As you can see, this is a wide range, so read on to find the correct calories for your slice depending on the bread type.
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How Many Calories Are in an Average Slice of Bread?
If you need to know the average calories for a generic slice of bread, the charts below will help you to work out what you need (depending on the loaf size and slice thickness).
Bread is typically sold in two main sizes of loaf, although they can vary depending on the brand or bread type, so I’ve split the sizes into the two most-common weights to keep things simple.
Calories are based on averages of 2.4kcal per gram of white bread and 2.3kcal per gram of wholemeal bread, which I’ve based on an average of various well-known brands and supermarket branded bread (see below).
Calories Per Slice From a Small (400g) Loaf
| Bread Slice Thickness (small loaf) | Average Weight Per Slice | Average Calories Per Slice |
| Thin White | 22g | 53kcal |
| Medium White | 30g | 72kcal |
| Thick White | 35g | 84kcal |
| Thin Wholemeal | 22g | 51kcal |
| Medium Wholemeal | 30g | 69kcal |
| Thick Wholemeal | 35g | 81kcal |
Calories Per Slice From a Large (800g) Loaf
| Bread Slice Thickness (small loaf) | Average Weight Per Slice | Average Calories Per Slice |
| Thin White | 35g | 84kcal |
| Medium White | 40g | 97kcal |
| Thick White | 50g | 120kcal |
| Thin Wholemeal | 35g | 81kcal |
| Medium Wholemeal | 40g | 95kcal |
| Thick Wholemeal | 50g | 115kcal |
If you need to know the calories for a specific brand and type of bread, you might want to skip to the next section.
Calories Per Slice of Bread – By Brand
The tables below show how many calories are in a slice of bread for various UK bread brands to help you quickly find the information you’re looking for.
It’s also helpful to compare various types of slices of bread all in one place to see which have the most calories and which have the least.
ASDA Bread Calories
| Bread Brand & Type | Average Weight Per Slice | Calories Per Slice |
| ASDA Soft White Medium Bread (800g loaf) | 40g | 96kcal |
| ASDA Soft wholemeal Medium Bread (800g loaf) | 40g | 93kcal |
Hovis Bread Calories
| Bread Brand & Type | Average Weight Per Slice | Calories Per Slice |
| Hovis Soft White Medium (800g loaf) | 43g | 93kcal |
| Hovis Soft White Thick (800g loaf) | 50g | 117kcal |
| Hovis Seed Sensations (800g loaf) | 47g | 131kcal |
| Hovis Granary Thick (800g loaf) | 44g | 112kcal |
| Hovis Soft Wholemeal Medium (800g loaf) | 40g | 88kcal |
| Hovis Soft Wholemeal Thick (800g loaf) | 47g | 104kcal |
| Hovis Granary Wholemeal (800g loaf) | 47g | 111kcal |
| Hovis Best of Both Medium (750g loaf) | 38g | 88kcal |
| Hovis Best of Both Thick (750g loaf) | 47g | 106kcal |
| Hovis Wholemeal Medium (400g loaf) | 29g | 64kcal |
| Hovis White (half loaf) (450g loaf) | 56g | 138kcal |
| Hovis Seeded (half loaf) (450g loaf) | 56g | 158kcal |
| Hovis Nimble Wholemeal (400g loaf) | 22g | 50kcal |
Kingsmill Bread Calories
| Bread Brand & Type | Average Weight Per Slice | Calories Per Slice |
| Kingsmill Soft White Medium Bread (800g loaf) | 40g | 95kcal |
| Kingsmill Tasty Wholemeal Medium Bread (800g loaf) | 40g | 94kcal |
| Kingsmill 50/50 Medium Bread (800g loaf) | 40g | 95kcal |
| Kingsmill 50/50 Thick Bread (800g loaf) | 44g | 104kcal |
| Kingsmill 50/50 No Crusts (400g loaf) | 22g | 47kcal |
| Kingsmill 50/50 (400g loaf) | 29g | 68kcal |
M&S Bread Calories
| Bread Brand & Type | Average Weight Per Slice | Calories Per Slice |
| M&S Supersoft Soft Thick Sliced White Bread (800g loaf) | 50g | 125kcal |
| M&S Supersoft Soft Medium Sliced White Bread (800g loaf) | 40g | 100kcal |
| M&S Supersoft Soft Medium Sliced Wholemeal Bread (800g loaf) | 40g | 94kcal |
Morrisons Bread Calories
| Bread Brand & Type | Average Weight Per Slice | Calories Per Slice |
| Morrisons Medium White Bread (800g loaf) | 36g | 84kcal |
| Morrisons Medium Wholemeal Bread (800g loaf) | 36g | 79kcal |
Roberts Bread Calories
| Bread Brand & Type | Average Weight Per Slice | Calories Per Slice |
| Roberts Bakery Medium Sliced White Bread (800g Loaf) | 40g | 98kcal |
| Roberts Bakery Thick Soft White (800g Loaf) | 45g | 114kcal |
| Roberts Bakery Heroic Wholemeal Bloomer (600g Loaf) | 38g | 87kcal |
| Roberts Bakery Seeded Farmhouse Thick Sliced (800g Loaf) | 40g | 94kcal |
Sainsbury’s Bread Calories
| Bread Brand & Type | Average Weight Per Slice | Calories Per Slice |
| Sainsbury’s Medium Soft White Bread (800g loaf) | 40g | 96kcal |
| Sainsbury’s Medium Wholemeal Bread (800g loaf) | 40g | 93kcal |
Tesco Bread Calories
| Bread Brand & Type | Average Weight Per Slice | Calories Per Slice |
| Tesco White Bread Medium Sliced (800g Loaf) | 40g | 95kcal |
| Tesco White Wholemeal Medium Sliced (800g Loaf) | 40g | 90kcal |
Warburtons Bread Calories
| Bread Brand & Type | Average Weight Per Slice | Calories Per Slice |
| Warburtons Medium Sliced White Bread (800g Loaf) | 40.3g | 98kcal |
| Warburtons Toastie Sliced White Bread (800g Loaf) | 47.4g | 116kcal |
| Warburtons Super Toastie Sliced White Bread (800g Loaf) | 57.5g | 140kcal |
| Warburtons Toastie Sliced White Bread (400g Loaf) | 28.8g | 70kcal |
| Warburtons Farmhouse White Bread (800g Loaf) | 42.7g | 104kcal |
| Warburtons Farmhouse White Bread (400g Loaf) | 27g | 66kcal |
| Warburtons Medium Sliced Wholemeal Bread (800g Loaf) | 44.8g | 103kcal |
| Warburtons Medium Sliced Wholemeal Bread (400g Loaf) | 23.8g | 55kcal |
| Warburtons Seeded Batch Bread (800g Loaf) | 45.8g | 134kcal |
| Warburtons Seeded Batch Bread (400g Loaf) | 29.9g | 85kcal |
| Warburtons Tiger Bread Bloomer (600g Loaf) | 37.5g | 94kcal |
| Warburtons Half And Half Medium Sliced Bread (800g Loaf) | 40.3g | 100kcal |
| Warburtons Old English White Bread (400g Loaf) | 40g | 99kcal |
| Warburtons Malted Grains and Seeds (400g Loaf) | 40g | 110kcal |
| Warburtons Multi-Grain and Seeds (400g Loaf) | 31g | 83kcal |
| Warburtons Danish Sliced White Bread (400g Loaf) | 25.8g | 62kcal |
| Warburtons Milk Roll (400g Loaf) | 18.4g | 46kcal |
| Warburtons White Loaf Gluten-Free (300g Loaf) | 27g | 67kcal |
| Warburtons Multiseed Loaf Gluten-Free (300g Loaf) | 27g | 78kcal |
More Bread Slice Calorie FAQs
Granary (or malted bread) or bread with added seeds, although generally higher in fiber, contains more calories because sugar molasses are usually added to the dough to create a deeper color and taste.
An average medium slice of white bread taken from a shop-bought 800g loaf weighs around 40g and contains an average of 97kcal per slice.
An average medium slice of wholemeal bread taken from a shop-bought 800g loaf weighs around 40g and contains an average of 95kcal per slice.
If you want to keep bread calories under 100kcal per slice, choose medium sliced or thin sliced bread white, or wholemeal bread, which weighs 40g or less. Bread from a small 400g loaf contains around 50-70kcal per slice and around 97kcal from a large 800g loaf.
Related Articles
I hope this post helped you to find the information you were looking for; you might also like the following related articles:
How Much Does a Slice of Bread Weigh? (Various Types & Conversions)