A standard slice of bread contains roughly 70 to 100 calories, depending on the type and thickness. White bread tends to land on the lower end of that range, while whole wheat and denser varieties run slightly higher per slice. But the real range opens up when you look beyond the sandwich aisle to bagels, wraps, and artisanal loaves, where a single serving can easily double or triple those numbers.
Calories in White and Whole Wheat Bread
A typical slice of commercially prepared white bread weighs about 28 grams (one ounce) and contains around 70 to 80 calories. Whole wheat bread comes in at roughly 80 or more calories per slice of the same size. The difference is small, but it adds up if you’re eating several slices a day.
The calorie gap between white and whole wheat isn’t really the important distinction. What changes more meaningfully is the fiber and protein content. A slice of white bread contains about 0.6 grams of fiber, while whole wheat delivers two to three times that amount. Protein also differs: white bread typically has 1 to 3 grams per slice, while whole wheat edges closer to 3 or 4 grams. These differences affect how full you feel after eating and how quickly your blood sugar rises, even when the calorie counts look similar on the label.
Sourdough, Rye, and Pumpernickel
Artisanal and specialty breads vary more than most people expect, largely because slice sizes aren’t standardized. A medium slice of sourdough (about 59 grams) contains around 188 calories, which sounds high until you realize that slice is roughly twice the weight of a standard sandwich bread slice. Gram for gram, sourdough is comparable to white bread.
Pumpernickel is lighter than it looks. Two slices (about 52 grams total) contain around 130 calories, putting it at roughly 65 calories per slice. Rye bread falls in a similar range to whole wheat at about 80 to 85 calories per standard one-ounce slice. The denser texture of both pumpernickel and rye comes with a fiber advantage: rye breads deliver significantly more fiber per serving than white bread, which helps explain why they feel more filling.
Bagels, English Muffins, and Wraps
This is where calorie counts climb fast. A plain bagel from a bakery or deli typically weighs 90 to 110 grams and packs 225 to 280 calories before you add anything to it. That’s the equivalent of three or four slices of sandwich bread. Per 100 grams, bagels contain about 250 calories.
English muffins are a lighter swap at about 227 calories per 100 grams, but a standard muffin weighs around 57 grams, bringing a single serving to roughly 130 calories. That’s still more than a slice of bread but considerably less than a bagel, which is why English muffins are a common recommendation for people trying to cut calories from breakfast sandwiches.
Flour tortillas and wraps range widely. A small 6-inch flour tortilla runs about 90 calories, while the large burrito-size wraps used for sandwich wraps can hit 200 to 300 calories. If you’re swapping bread for a wrap thinking you’re saving calories, check the size. A large wrap often contains more than two slices of bread would.
Sprouted Grain and High-Fiber Breads
Sprouted grain breads, like the well-known Ezekiel 4:9 brand, come in at about 80 calories per 34-gram slice. That’s roughly the same as whole wheat. The real difference is in the nutritional profile: a slice of Ezekiel bread has 5 grams of protein (compared to 1 to 3 grams in most breads), 3 grams of fiber, and zero grams of sugar. White bread of the same weight contains just 0.6 grams of fiber and 1.5 grams of sugar.
These numbers matter more than they might seem. The higher protein and fiber content means sprouted grain bread is more filling per calorie. You’re less likely to reach for a second sandwich or snack an hour later.
Why Fiber Changes How Bread Calories Work
Not all bread calories behave the same way in your body. Fiber slows digestion, limits how quickly sugar enters your bloodstream, and triggers hormones that signal fullness. A systematic review in Nutrition Reviews found that fiber in grain foods influences appetite through several mechanisms: it requires more chewing, which itself promotes fullness, and it increases the thickness of digested food moving through your gut, slowing nutrient absorption and keeping blood sugar steadier.
The practical effect is straightforward. Two slices of white bread (about 95 grams) might contain only 3.9 grams of fiber, while two slices of whole grain rye bread (113 grams) deliver over 10 grams. Even though the rye bread contains more total calories due to its weight, the fiber load means it keeps you satisfied longer and produces a smaller blood sugar spike. Research suggests that as little as 2 grams of additional fiber per serving can produce a measurable effect on satiety.
Quick Calorie Comparison by Bread Type
- White bread (1 slice, ~28g): 70 to 80 calories
- Whole wheat bread (1 slice, ~28g): 80 to 90 calories
- Sprouted grain bread (1 slice, ~34g): 80 calories
- Pumpernickel (1 slice, ~26g): 65 calories
- Rye bread (1 slice, ~28g): 80 to 85 calories
- Sourdough (1 medium slice, ~59g): 188 calories
- English muffin (1 whole, ~57g): 130 calories
- Plain bagel (1 whole, ~100g): 250 calories
What Actually Drives the Calorie Count
The biggest factor in bread calories isn’t the type of grain. It’s the size and density of the slice. A thick-cut sourdough from an artisan bakery can weigh 60 to 70 grams, while a thin slice of sandwich bread weighs half that. Double the weight, double the calories. When comparing breads, always check the gram weight on the nutrition label rather than assuming “one slice” means the same thing across brands.
Added ingredients also shift the number. Breads with honey, molasses, seeds, nuts, or oils will run higher than plain loaves. A slice of oat nut bread or a honey wheat variety can easily hit 110 to 120 calories per slice. On the other end, some diet or “light” breads use thinner slices and added fiber to bring each slice down to 40 to 45 calories, though the tradeoff is a slice that barely holds a sandwich together.
If you’re tracking calories, the most useful habit is weighing your bread on a kitchen scale rather than counting slices. A “slice” can mean anything from 25 to 70 grams depending on the loaf, and that difference alone can account for 50 to 100 calories per sandwich.