How much protein is in toasted white bread?

Toasted white bread has 9 g of protein per 100 g and 2.4 g per 1 slice, large (27 g). That is 3.1 g of protein per 100 kcal — a modest protein contribution.

Where do these calorie figures come from?

USDA FoodData Central record 174925, “Bread, white, commercially prepared, toasted” (SR Legacy, FDC SR Legacy 2018-04 + FNDDS 2024-10-31). Energy is USDA nutrient 1008 (Energy, kcal); protein, fat and carbohydrate are read from the same record. USDA data is in the public domain, and the FDC ID above links straight to it.

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BreadUSDA SR LegacyFDC 174925

Calories in toasted white bread

USDA FoodData Central record for “Bread, white, commercially prepared, toasted” — per 100 g, per every USDA serving size, and next to the other bread rows.

The short answer

Toasted white bread: 290 kcal per 100 g. 1 slice, large (27 g) is 78 kcal with 2.4 g of protein. Source: USDA FoodData Central record 174925, "Bread, white, commercially prepared, toasted".

Per 100 g

Nutrient	Per 100 g	Share of energy
Energy	290 kcal	100%
Protein	9 g	12%
Fat	4 g	12%
Carbohydrate	54.5 g	75%

Toasted white bread is 290 kcal per 100 g in USDA FoodData Central (SR Legacy). Of that energy, about 12% comes from protein, 12% from fat and 75% from carbohydrate. That works out to 3.1 g of protein per 100 kcal — a modest protein contribution.

Per serving

The serving sizes USDA lists for this record, priced from the per-100 g figures above. Nothing here is rounded to a “portion” — the gram weight next to each label is what the calories are computed from.

Serving	Weight	Calories	Protein	Fat	Carbs
100 g	100 g	290	9 g	4 g	54.5 g
1 oz	28 g	82	2.6 g	1.1 g	15.5 g
1 cup, crumbs	45 g	131	4.1 g	1.8 g	24.5 g
1 cup, cubes	42 g	122	3.8 g	1.7 g	22.9 g
1 slice, large	27 g	78	2.4 g	1.1 g	14.7 g
1 slice crust not eaten	11 g	32	1 g	0.4 g	6 g
1 slice, thin	17 g	49	1.5 g	0.7 g	9.3 g
1 slice thin, crust not eaten	8 g	23	0.7 g	0.3 g	4.4 g
1 slice, very thin	13 g	38	1.2 g	0.5 g	7.1 g

Compared with other bread

Food	kcal / 100 g	Protein / 100 g	Per serving
White bread	266	8.9 g	77 kcal · 1 slice
Toasted white bread	290	9 g	78 kcal · 1 slice, large
Whole-wheat bread	252	12.5 g	81 kcal · 1 slice
Toasted whole-wheat bread	306	16.3 g	77 kcal · 1 slice

Questions about toasted white bread

How many calories are in toasted white bread?: Toasted white bread: 290 kcal per 100 g. 1 slice, large (27 g) is 78 kcal with 2.4 g of protein. Source: USDA FoodData Central record 174925, "Bread, white, commercially prepared, toasted".
How much protein is in toasted white bread?: Toasted white bread has 9 g of protein per 100 g and 2.4 g per 1 slice, large (27 g). That is 3.1 g of protein per 100 kcal — a modest protein contribution.
Where do these calorie figures come from?: USDA FoodData Central record 174925, “Bread, white, commercially prepared, toasted” (SR Legacy, FDC SR Legacy 2018-04 + FNDDS 2024-10-31). Energy is USDA nutrient 1008 (Energy, kcal); protein, fat and carbohydrate are read from the same record. USDA data is in the public domain, and the FDC ID above links straight to it.

How calorie.one logs it

Type “toasted white bread” into calorie.one and the app matches this exact record — “Bread, white, commercially prepared, toasted” — estimates the grams, and shows the line with its USDA label. You correct the amount; the per-100 g figure is never guessed. That split between recognition and arithmetic is the whole methodology. For the numbers in context, read How accurate is calorie counting, really?.