It’s one of the most basic yet popular foods we love to snack on, either on its own or as a side dish, but how many calories does this simple snack really contain.
It’s a question that is difficult to give a straightforward answer to because bread comes in so many shapes and sizes, with different ingredients and slice thicknesses.
So, I’ve researched average bread weights and sizes and specific brands to give you a definitive answer on exactly how many calories are in your slice of bread and butter. Read on to find the information you need in our quick and easy charts.
How Much Butter Do You Put on Bread?
Before you can work out how many calories are in your slice of bread and butter, you need to know how much butter you have on your bread.
Because butter is high in calories, a small amount can make a big difference, especially if you’re trying to stick to a certain amount of calories per day.
I did some research to find an average amount of butter or margarine per slice of bread, and I found the following;
The average amount of butter or margarine you need to lightly cover a slice of bread is 5g or one teaspoon per slice. 10g of butter gives a thicker coverage, and 15g gives a very thick butter covering per slice.
The image below shows how much butter coverage you get with 5, 10, and 15g of butter to help you work out how much you usually use.
How Many Calories are in a Portion of Butter or Margarine
Here’s the information in case you need to know how many calories are in enough butter or margarine to cover a slice of bread.
This is based on average amounts from mainstream brands that are available in supermarkets.
| Butter or Margarine Amount | Pure Butter calories | Margarine (vegetable fat-based) calories |
| 5g | 37kcal | 32kcal |
| 10g | 74kcal | 63kcal |
| 15g | 111kcal | 95kcal |
Average Calories in Bread & Butter or Margarine
The tables below show the calories for average bread slice weights with butter or margarine, depending on the size and thickness of your slice.
To help you find the correct information, I’ve split them out into small 400g loaves and large 800g loaves, which are the two most popular bread sizes sold in shops and supermarkets.
Because people tend to spread their butter more thickly when eating bread and butter, I’ve based the charts on 10g of butter or margarine per slice.
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 For a Small (400g) Loaf
| Bread Slice Thickness (small 400g loaf) | Calories Per Slice With 10g of Butter | Calories Per Slice With 10g of Margarine |
| Thin White (22g per slice) | 127kcal | 116kcal |
| Medium White (30g per slice) | 146kcal | 135kcal |
| Thick White (35g per slice) | 158kcal | 147kcal |
| Thin Wholemeal (22g per slice) | 125kcal | 114kcal |
| Medium Wholemeal (30g per slice) | 143kcal | 122kcal |
| Thick Wholemeal (35g per slice) | 155kcal | 144kcal |
Calories Per Slice For a Large (800g) Loaf
| Bread Slice Thickness (large 800g loaf) | Calories Per Slice With 10g of Butter | Calories Per Slice With 10g of Margarine |
| Thin White (35g per slice) | 158kcal | 147kcal |
| Medium White (40g per slice) | 171kcal | 160kcal |
| Thick White (50g per slice) | 194kcal | 183kcal |
| Thin Wholemeal (35g per slice) | 155kcal | 144kcal |
| Medium Wholemeal (40g per slice) | 169kcal | 158kcal |
| Thick Wholemeal (50g per slice) | 189kcal | 178kcal |
Brand Bread & Butter Calories
If you need to know the calories in a slice of bread and butter for a specific brand of bread, use the charts below to find the information you’re looking for.
This is based on a medium-thick coating of butter or margarine of 10g per slice because people tend to use more butter when they’re just eating bread and butter alone.
Hovis Bread & Butter or Margarine Calories
| Bread Type | Calories Per Slice of Bread & Butter | Calories Per Slice of Bread & Margarine |
| Hovis Soft White Medium (800g loaf) | 167kcal | 156kcal |
| Hovis Soft White Thick (800g loaf) | 191kcal | 180kcal |
| Hovis Seed Sensations (800g loaf) | 205kcal | 194kcal |
| Hovis Granary Thick (800g loaf) | 186kcal | 175kcal |
| Hovis Soft Wholemeal Medium (800g loaf) | 162kcal | 151kcal |
| Hovis Soft Wholemeal Thick (800g loaf) | 178kcal | 167kcal |
| Hovis Granary Wholemeal (800g loaf) | 185kcal | 174kcal |
| Hovis Best of Both Medium (750g loaf) | 162kcal | 151kcal |
| Hovis Best of Both Thick (750g loaf) | 180kcal | 169kcal |
| Hovis Wholemeal Medium (400g loaf) | 138kcal | 127kcal |
| Hovis White (half loaf) (450g loaf) | 212kcal | 201kcal |
| Hovis Seeded (half loaf) (450g loaf) | 232kcal | 221kcal |
| Hovis Nimble Wholemeal (400g loaf) | 124kcal | 113kcal |
Kingsmill Bread & Butter or Margarine Calories
| Bread Type | Calories Per Slice of Bread & Butter | Calories Per Slice of Bread & Margarine |
| Kingsmill Soft White Medium Bread (800g loaf) | 169kcal | 158kcal |
| Kingsmill Tasty Wholemeal Medium Bread (800g loaf) | 168kcal | 157kcal |
| Kingsmill 50/50 Medium Bread (800g loaf) | 169kcal | 158kcal |
| Kingsmill 50/50 Thick Bread (800g loaf) | 178kcal | 167kcal |
| Kingsmill 50/50 No Crusts (400g loaf) | 121kcal | 110kcal |
| Kingsmill 50/50 (400g loaf) | 142kcal | 131kcal |
Warburtons Bread & Butter or Margarine Calories
| Bread Type | Calories Per Slice of Bread & Butter | Calories Per Slice of Bread & Margarine |
| Warburtons Medium Sliced White Bread (800g Loaf) | 172kcal | 161kcal |
| Warburtons Toastie Sliced White Bread (800g Loaf) | 190kcal | 179kcal |
| Warburtons Super Toastie Sliced White Bread (800g Loaf) | 214kcal | 203kcal |
| Warburtons Toastie Sliced White Bread (400g Loaf) | 144kcal | 133kcal |
| Warburtons Farmhouse White Bread (800g Loaf) | 178kcal | 167kcal |
| Warburtons Farmhouse White Bread (400g Loaf) | 140kcal | 129kcal |
| Warburtons Medium Sliced Wholemeal Bread (800g Loaf) | 177kcal | 166kcal |
| Warburtons Medium Sliced Wholemeal Bread (400g Loaf) | 129kcal | 118kcal |
| Warburtons Seeded Batch Bread (800g Loaf) | 208kcal | 197kcal |
| Warburtons Seeded Batch Bread (400g Loaf) | 159kcal | 148kcal |
| Warburtons Tiger Bread Bloomer (600g Loaf) | 168kcal | 157kcal |
| Warburtons Half And Half Medium Sliced Bread (800g Loaf) | 174kcal | 163kcal |
| Warburtons Old English White Bread (400g Loaf) | 173kcal | 162kcal |
| Warburtons Multi-Grain and Seeds (400g Loaf) | 157kcal | 146kcal |
| Warburtons Malted Grains and Seeds (400g Loaf) | 184kcal | 173kcal |
| Warburtons Danish Sliced White Bread (400g Loaf) | 136kcal | 125kcal |
| Warburtons Milk Roll (400g Loaf) | 120kcal | 109kcal |
| Warburtons White Loaf Gluten-Free (300g Loaf) | 141kcal | 130kcal |
| Warburtons Multiseed Loaf Gluten-Free (300g Loaf) | 152kcal | 141kcal |
Roberts Bakery Bread & Butter or Margarine Calories
| Bread Type | Calories Per Slice of Bread & Butter | Calories Per Slice of Bread & Margarine |
| Roberts Bakery Medium Sliced White Bread (800g Loaf) | 172kcal | 161kcal |
| Roberts Bakery Thick Soft White (800g Loaf) | 188kcal | 177kcal |
| Roberts Bakery Heroic Wholemeal Bloomer (600g Loaf) | 161kcal | 150kcal |
| Roberts Bakery Seeded Farmhouse Thick Sliced (800g Loaf) | 168kcal | 157kcal |
Tesco Bread & Butter or Margarine Calories
| Bread Type | Calories Per Slice of Bread & Butter | Calories Per Slice of Bread & Margarine |
| Tesco White Bread Medium Sliced (800g Loaf) | 169kcal | 158kcal |
| Tesco White Wholemeal Medium Sliced (800g Loaf) | 164kcal | 153kcal |
M&S Bread & Butter or Margarine Calories
| Bread Type | Calories Per Slice of Bread & Butter | Calories Per Slice of Bread & Margarine |
| M&S Supersoft Soft Thick Sliced White Bread (800g loaf) | 199kcal | 187kcal |
| M&S Supersoft Soft Medium Sliced White Bread (800g loaf) | 174kcal | 163kcal |
| M&S Supersoft Soft Medium Sliced Wholemeal Bread (800g loaf) | 168kcal | 157kcal |
ASDA Bread & Butter or Margarine Calories
| Bread Type | Calories Per Slice of Bread & Butter | Calories Per Slice of Bread & Margarine |
| ASDA Soft White Medium Bread (800g loaf) | 170kcal | 159kcal |
| ASDA Soft wholemeal Medium Bread (800g loaf) | 167kcal | 156kcal |
Morrisons Bread & Butter or Margarine Calories
| Bread Type | Calories Per Slice of Bread & Butter | Calories Per Slice of Bread & Margarine |
| Morrisons Medium White Bread (800g loaf) | 158kcal | 147kcal |
| Morrisons Medium Wholemeal Bread (800g loaf) | 153kcal | 142kcal |
Sainsbury’s Bread & Butter or Margarine Calories
| Bread Type | Calories Per Slice of Bread & Butter | Calories Per Slice of Bread & Margarine |
| Sainsbury’s Medium Soft White Bread (800g loaf) | 170kcal | 159kcal |
| Sainsbury’s Medium Wholemeal Bread (800g loaf) | 167kcal | 156kcal |
More Bread & Butter Calorie FAQs
The lowest calorie bread comes from small (400g) thin-sliced wholemeal loaves, which average at around 45-60kcal per slice. A thin covering (5g) of butter brings the total to around 100kcal per slice of bread and butter.
Based on an average medium-sliced slice of white bread with 10g of pure butter per slice, there are around 342kcal in two slices of bread and butter.
Based on an average medium-sliced slice of white bread with 10g of pure butter per slice, there are around 513kcal in three slices of bread and butter.
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