How many carbs are in white bread?
One large slice of white bread has about 15g of carbohydrate and 14g of net carbs. A standard sandwich on two slices delivers roughly 30g of carbs before any filling.
Carbs by portion
| Portion | Total carbs | Fiber | Net carbs |
|---|---|---|---|
| 1 large slice (27g) | 14.7g | 0.8g | 13.9g |
| 1 cup, cubes (42g) | 22.9g | 1.2g | 21.7g |
| 1 slice, thin (17g) | 9.3g | 0.5g | 8.8g |
| 1 slice crust not eaten (11g) | 6.0g | 0.3g | 5.7g |
| 100 grams | 54.5g | 2.9g | 51.6g |
Net carbs
One large slice of white bread has about 14g of net carbs, which is total carbs (15g) minus less than 1g of fiber. White bread provides very little fiber, so nearly all the carbs are available to raise blood glucose. See the net carbs guide.
Glycemic index of white bread
The glycemic index of white bread is about 75. White bread has one of the highest glycemic indexes of any common food, similar to glucose itself. The fine-milled flour and lack of intact grain structure means it digests almost immediately.
For diabetes
Two slices of white bread are about 30g of carbs with a very high GI of 75. That is a fast, significant blood sugar rise at the start of a meal. Whole wheat or dense seeded bread lowers both the carb density and the GI. If white bread is part of the meal, pairing it with protein and fat (eggs, cheese, nut butter) slows gastric emptying and blunts the spike. See the diabetes carb-counting guide.
Keto and low carb
Two slices of white bread have about 28g of net carbs, which is a full day's keto budget or more. White bread does not fit keto. Low-carb bread products made with almond flour or resistant starch can substitute, but read labels because they vary widely.
Good to know
Bread slices vary significantly by brand and loaf style. A thin sandwich slice (17g) has about 9g of carbs. A thick bakery slice (45g or more) can carry 24g. Most commercial white bread falls between 20g and 30g per slice. The crust contains slightly more carbs per gram than the crumb because it is denser. Toasting does not meaningfully change the carb content.
Full nutrition (per 100g)
- Calories: 290.0 kcal
- Carbohydrate: 54.5g
- Fiber: 2.9g
- Sugars: 6.2g
- Protein: 9.0g
- Fat: 4.0g
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Get the appFrequently asked questions
How many carbs are in a slice of white bread?
A large slice (27g) has about 15g of carbohydrate. A thin slice (17g) has about 9g. A two-slice sandwich has roughly 30g of carbs.
What is the glycemic index of white bread?
White bread has a GI of about 75, one of the highest of any common food. It raises blood glucose about as fast as straight glucose.
Is white bread keto?
No. Two slices have about 28g of net carbs, filling or exceeding a full day's keto budget.
How does white bread compare to whole wheat bread in carbs?
A slice of white bread has about 15g of carbs. A slice of whole wheat has about 14g, but the whole wheat slice has twice the fiber (4g vs 1g), so its net carbs are lower and the GI is meaningfully less.
Does toasting bread change the carbs?
No. Toasting removes water but does not change the carbohydrate content. The carbs per gram are slightly higher in toast because it is denser, but the total per slice is the same.