Calories in white bread.
266 kcal per 100 g.
A standard slice of commercial white bread is about 29 g and 77 kcal. Per 100 g, bread is denser than cooked rice or potato because it holds far less water — the slice, not the loaf, is the unit to log.
Bread, white, commercially prepared (includes soft bread crumbs) · SR Legacy (2018-04) · USDA FDC 174924
Nutrition for your portion
| Nutrient | Per 100 g | 100 g |
|---|---|---|
| Energy | 266 kcal | 266 kcal |
| Protein | 8.85 g | 8.85 g |
| Carbohydrates | 49.4 g | 49.4 g |
| Fat | 3.33 g | 3.33 g |
| Fibre | 2.7 g | 2.7 g |
| Sugars | 5.67 g | 5.67 g |
| Saturated fat | 0.7 g | 0.7 g |
| Sodium | 490 mg | 490 mg |
| Salt (calculated from sodium) | 1.23 g | 1.23 g |
| Vitamin A (RAE) | 0 ug | 0 ug |
| Vitamin D (D2 + D3) | 0 ug | 0 ug |
| Vitamin E (alpha-tocopherol) | 0.22 mg | 0.22 mg |
| Vitamin K (phylloquinone) | 0.2 ug | 0.2 ug |
| Vitamin C | 0 mg | 0 mg |
| Thiamin | 0.53 mg | 0.53 mg |
| Riboflavin | 0.24 mg | 0.24 mg |
| Niacin | 4.78 mg | 4.78 mg |
| Vitamin B6 | 0.09 mg | 0.09 mg |
| Folate, total | 111 ug | 111 ug |
| Vitamin B12 | 0 ug | 0 ug |
| Potassium | 126 mg | 126 mg |
| Calcium | 144 mg | 144 mg |
| Phosphorus | 98 mg | 98 mg |
| Magnesium | 23 mg | 23 mg |
| Iron | 3.61 mg | 3.61 mg |
| Zinc | 0.74 mg | 0.74 mg |
| Selenium | 22 ug | 22 ug |
| Iodine | Unknown | Unknown |
| Copper | 0.1 mg | 0.1 mg |
Energy comes from USDA nutrient 1008. Salt is calculated as sodium × 2.5, with unit conversion to grams. It is not a separately measured salt value.
Preparation
Toasting removes water and nothing else. A slice loses two or three grams of moisture, so toasted white bread reads higher per 100 g but a toasted slice has the same calories as the untoasted one. What toasting invites is the topping — butter at 100 kcal per tablespoon changes a 77 kcal slice more than any toaster can.
Logging this food
Slices vary more than people think: USDA's slice is 29 g (77 kcal), but sandwich-thick bakery slices run 40–50 g (105–130 kcal), and "thin" sliced 20 g. Weigh one slice from each loaf you buy and log by weight thereafter. Crusts trimmed off remove about a fifth of the weight.
Swaps and alternatives
Whole-wheat bread is not lower in calories — about 250 kcal per 100 g against 266 — but it carries more fibre and protein per slice. The calorie saving comes from thinner slices or fewer of them, or from open sandwiches. Swapping bread for a wrap rarely saves anything; large tortillas run 200 kcal or more each.