How Many Calories Are in a Slice of Bread? (UK)

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 SliceAverage Calories Per Slice
Thin White22g53kcal
Medium White30g72kcal
Thick White35g84kcal
Thin Wholemeal22g51kcal
Medium Wholemeal30g69kcal
Thick Wholemeal35g81kcal

Calories Per Slice From a Large (800g) Loaf

Bread Slice Thickness (small loaf)Average Weight Per SliceAverage Calories Per Slice
Thin White35g84kcal
Medium White40g97kcal
Thick White50g120kcal
Thin Wholemeal35g81kcal
Medium Wholemeal40g95kcal
Thick Wholemeal50g115kcal

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 & TypeAverage Weight Per SliceCalories Per Slice
ASDA Soft White Medium Bread
(800g loaf)
40g96kcal
ASDA Soft wholemeal Medium Bread
(800g loaf)
40g93kcal

Hovis Bread Calories

Bread Brand & TypeAverage Weight Per SliceCalories Per Slice
Hovis Soft White Medium
(800g loaf)
43g93kcal
Hovis Soft White Thick
(800g loaf)
50g117kcal
Hovis Seed Sensations
(800g loaf)
47g131kcal
Hovis Granary Thick
(800g loaf)
44g112kcal
Hovis Soft Wholemeal Medium
(800g loaf)
40g88kcal
Hovis Soft Wholemeal Thick
(800g loaf)
47g104kcal
Hovis Granary Wholemeal
(800g loaf)
47g111kcal
Hovis Best of Both Medium
(750g loaf)
38g88kcal
Hovis Best of Both Thick
(750g loaf)
47g106kcal
Hovis Wholemeal Medium
(400g loaf)
29g64kcal
Hovis White (half loaf)
(450g loaf)
56g138kcal
Hovis Seeded (half loaf)
(450g loaf)
56g158kcal
Hovis Nimble Wholemeal
(400g loaf)
22g50kcal

Kingsmill Bread Calories

Bread Brand & TypeAverage Weight Per SliceCalories Per Slice
Kingsmill Soft White Medium Bread
(800g loaf)
40g95kcal
Kingsmill Tasty Wholemeal Medium Bread
(800g loaf)
40g94kcal
Kingsmill 50/50 Medium Bread
(800g loaf)
40g95kcal
Kingsmill 50/50 Thick Bread
(800g loaf)
44g104kcal
Kingsmill 50/50 No Crusts
(400g loaf)
22g47kcal
Kingsmill 50/50
(400g loaf)
29g68kcal

M&S Bread Calories

Bread Brand & TypeAverage Weight Per SliceCalories Per Slice
M&S Supersoft Soft Thick Sliced White Bread (800g loaf)50g125kcal
M&S Supersoft Soft Medium Sliced White Bread (800g loaf)40g100kcal
M&S Supersoft Soft Medium Sliced Wholemeal Bread (800g loaf)40g94kcal

Morrisons Bread Calories

Bread Brand & TypeAverage Weight Per SliceCalories Per Slice
Morrisons Medium White Bread
(800g loaf)
36g84kcal
Morrisons Medium Wholemeal Bread
(800g loaf)
36g79kcal

Roberts Bread Calories

Bread Brand & TypeAverage Weight Per SliceCalories Per Slice
Roberts Bakery Medium Sliced White Bread
(800g Loaf)
40g98kcal
Roberts Bakery Thick Soft White
(800g Loaf)
45g114kcal
Roberts Bakery Heroic Wholemeal Bloomer
(600g Loaf)
38g87kcal
Roberts Bakery Seeded Farmhouse Thick Sliced (800g Loaf)40g94kcal

Sainsbury’s Bread Calories

Bread Brand & TypeAverage Weight Per SliceCalories Per Slice
Sainsbury’s Medium Soft White Bread
(800g loaf)
40g96kcal
Sainsbury’s Medium Wholemeal Bread
(800g loaf)
40g93kcal

Tesco Bread Calories

Bread Brand & TypeAverage Weight Per SliceCalories Per Slice
Tesco White Bread Medium Sliced
(800g Loaf)
40g95kcal
Tesco White Wholemeal Medium Sliced
(800g Loaf)
40g90kcal

Warburtons Bread Calories

Bread Brand & TypeAverage Weight Per SliceCalories Per Slice
Warburtons Medium Sliced White Bread
(800g Loaf)
40.3g98kcal
Warburtons Toastie Sliced White Bread
(800g Loaf)
47.4g116kcal
Warburtons Super Toastie Sliced White Bread
(800g Loaf)
57.5g140kcal
Warburtons Toastie Sliced White Bread
(400g Loaf)
28.8g70kcal
Warburtons Farmhouse White Bread
(800g Loaf)
42.7g104kcal
Warburtons Farmhouse White Bread
(400g Loaf)
27g66kcal
Warburtons Medium Sliced Wholemeal Bread (800g Loaf)44.8g103kcal
Warburtons Medium Sliced Wholemeal Bread (400g Loaf)23.8g55kcal
Warburtons Seeded Batch Bread
(800g Loaf)
45.8g134kcal
Warburtons Seeded Batch Bread
(400g Loaf)
29.9g85kcal
Warburtons Tiger Bread Bloomer
(600g Loaf)
37.5g94kcal
Warburtons Half And Half
Medium Sliced Bread (800g Loaf)
40.3g100kcal
Warburtons Old English White Bread
(400g Loaf)
40g99kcal
Warburtons Malted Grains and Seeds
(400g Loaf)
40g110kcal
Warburtons Multi-Grain and Seeds
(400g Loaf)
31g83kcal
Warburtons Danish Sliced White Bread
(400g Loaf)
25.8g62kcal
Warburtons Milk Roll
(400g Loaf)
18.4g46kcal
Warburtons White Loaf Gluten-Free
(300g Loaf)
27g67kcal
Warburtons Multiseed Loaf Gluten-Free
(300g Loaf)
27g78kcal

More Bread Slice Calorie FAQs

Why are Granary and Seeded Breads Higher in Calories?

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.

How Many Calories Are in a Single Slice of White Bread?

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.

How Many Calories Are in a Single Slice of Wholemeal Bread?

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.

Is a Slice of Bread Under 100 calories?

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)

Croissant Weights and Calories (Various Types With Charts)