A standard slice of white bread has about 75 calories, and a slice of whole wheat is a touch higher at about 80 calories, according to USDA FoodData Central. Bread is mostly carbohydrate with a little protein and very little fat, so the number on your plate comes down to two things: the type of bread and, more than anything, how big the slice is. Get those two right and bread is one of the easiest foods to fit into a calorie budget.
The quick answer: calories in bread
Per 100 grams, white bread is about 270 calories and whole wheat is about 255. But almost nobody eats bread by the 100 grams, so the slice is the unit that matters. Because a slice of white bread weighs roughly 28 grams and a slice of whole wheat about 32 grams, you land in the same ballpark either way.
Here is how a single slice breaks down:
- White bread (about 28 g): about 75 kcal, 2.5 g protein, 14 g carbs, 1 g fat, 0.6 g fiber
- Whole wheat bread (about 32 g): about 80 kcal, 4 g protein, 14 g carbs, 1 g fat, 2 g fiber
The headline difference is not calories, it is fiber. Whole wheat gives you roughly three times the fiber of white for almost the same calorie count, which is the main reason it tends to be more filling. For more reference numbers like these, our Food and Calorie Guides hub keeps them in one place.
Calories by type of bread, per slice
“A slice of bread” is not a fixed amount, and the type matters too. The table below shows typical calories per slice for the most common breads. White and whole wheat use the USDA per-slice figures; sourdough and multigrain vary more by bakery and slice thickness, so treat those as good estimates rather than exact numbers.
| Bread (per slice) | Slice weight | Calories | Carbs | Fiber |
|---|---|---|---|---|
| White, sandwich | about 28 g | about 75 | 14 g | 0.6 g |
| Whole wheat, sandwich | about 32 g | about 80 | 14 g | 2 g |
| Multigrain | about 26 g | about 70 | 12 g | 2 g |
| Sourdough, bakery slice | about 50 g | about 145 | 29 g | 1.5 g |
A few things stand out. A thick bakery sourdough slice can carry nearly twice the calories of a thin sandwich slice, simply because it weighs more, not because sourdough is inherently high in calories. And “multigrain” is a marketing term, not a guarantee: it only means more than one grain, so a multigrain loaf can still be made mostly from refined flour. If fiber is what you are after, look for “100% whole grain” or “whole wheat” as the first ingredient.
Why slice size is the number that matters
The biggest swing in bread calories is not white versus whole wheat, it is the size of the slice. A thin “light” sandwich slice might be 20 grams, a standard slice about 28 to 32 grams, and a thick-cut artisan slice 50 grams or more. That range alone can take a single slice from roughly 55 calories to over 140.
What this means in practice:
- Two slices is the real sandwich number. Build a sandwich and you are starting at about 150 to 160 calories from the bread before anything goes inside.
- “Thin” or “light” breads are a genuine shortcut. They cut the slice weight, which cuts the calories, often without you noticing much difference on the plate.
- Bakery and artisan loaves are denser. A hand-cut slice can easily be double a packaged sandwich slice, so weigh it if you want an accurate log.
If you are tracking carefully, weighing the slice beats guessing, because “a slice of bread” can mean anywhere from about 55 to 145 calories.
Whole grain versus white: it is about fiber
The calorie gap between white and whole wheat is small, but the nutrition gap is not. Whole grain bread keeps the bran and germ of the wheat, which is where most of the fiber, B vitamins, and minerals live. White bread is made from refined flour with those parts stripped out.
That extra fiber does real work. It slows digestion, blunts the blood sugar spike you get from refined carbs, and helps you feel full for longer on the same calories. Major health bodies consistently recommend making at least half your grains whole, and higher whole grain intake is linked with better long-term health outcomes (Harvard Nutrition Source; Dietary Guidelines for Americans). For weight management, the practical upshot is simple: for almost identical calories, whole grain bread tends to keep you satisfied longer than white. Swapping white for whole grain is one of the easy upgrades in our guide to healthy food swaps.
Toppings: where bread calories really add up
Plain bread is rarely the problem. At about 75 to 80 calories a slice, it is what goes on top that moves the total. A tablespoon of butter adds roughly 100 calories, a tablespoon of mayonnaise about 90, peanut butter around 95, and a slice of cheese 70 to 110. It is entirely possible for the toppings to out-calorie the bread two or three times over.
This is exactly why logging the bread and the toppings separately is worth the effort:
- Measure spreads with a spoon, not a knife-load. Free-handing butter or oil is one of the most common ways a “light” piece of toast quietly doubles.
- Lead with the bread, then build smart. Lean protein, vegetables, and lighter spreads keep an open-faced toast or sandwich satisfying without the calorie creep.
- Account for both halves of a sandwich. Two slices plus a generous filling can turn a 150-calorie bread base into a 500-calorie lunch fast.
A tracking app like CalcEat lets you log the bread and each topping separately, so the math stays honest instead of hiding in a single guessed entry.
How bread fits a calorie budget
Bread fits weight loss and maintenance perfectly well; it is just a matter of accounting for it. Because a slice is a clean, predictable 75 to 80 calories, it is one of the easier foods to plan around once you know your numbers.
A few simple ways to keep bread working for your goals:
- Pick whole grain when you can. Same calories, more fiber, more staying power. If you are figuring out your own intake, our guide on how many calories you should eat to lose weight lays out the math.
- Mind the slice and the spread. The slice size and the toppings are the two variables that actually move your daily total, not the bread brand.
- Count it as the carb it is. Bread is mostly carbohydrate with a little protein and barely any fat, which makes it easy to slot into a daily target. Our guide on how to count macros walks through balancing the rest of your plate around it.
If you build meals around a protein source, bread becomes the supporting carb rather than the main event, which keeps both the calories and the fullness in your favor. The same logic applies to other everyday staples, like the protein-forward breakfast in our look at the calories in an egg.
The bottom line
A slice of white bread is about 75 calories and a slice of whole wheat about 80, with bread overall sitting near 255 to 270 calories per 100 grams. The type barely changes the calorie count, but whole grain wins clearly on fiber, which is what makes it more filling. The two things that really move your total are the size of the slice and what you put on it.
Keep it simple: choose whole grain when you can, weigh thick artisan slices if you want accuracy, and measure your spreads. Track the bread and the toppings separately, stay consistent, and the numbers will take care of themselves.
This article is general information, not medical or dietary advice for your specific situation.
