How much protein is in toasted whole-wheat bread?

Toasted whole-wheat bread has 16.3 g of protein per 100 g and 4.1 g per 1 slice (25 g). That is 5.3 g of protein per 100 kcal — a modest protein contribution.

Where do these calorie figures come from?

USDA FoodData Central record 172689, “Bread, whole-wheat, 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.

All foods

BreadUSDA SR LegacyFDC 172689

Calories in toasted whole-wheat bread

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

The short answer

Toasted whole-wheat bread: 306 kcal per 100 g. 1 slice (25 g) is 77 kcal with 4.1 g of protein. Source: USDA FoodData Central record 172689, "Bread, whole-wheat, commercially prepared, toasted".

Per 100 g

Nutrient	Per 100 g	Share of energy
Energy	306 kcal	100%
Protein	16.3 g	21%
Fat	4.1 g	12%
Carbohydrate	51.2 g	67%

Toasted whole-wheat bread is 306 kcal per 100 g in USDA FoodData Central (SR Legacy). Of that energy, about 21% comes from protein, 12% from fat and 67% from carbohydrate. That works out to 5.3 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	306	16.3 g	4.1 g	51.2 g
1 oz	28 g	87	4.6 g	1.2 g	14.5 g
1 slice	25 g	77	4.1 g	1 g	12.8 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 whole-wheat bread

How many calories are in toasted whole-wheat bread?: Toasted whole-wheat bread: 306 kcal per 100 g. 1 slice (25 g) is 77 kcal with 4.1 g of protein. Source: USDA FoodData Central record 172689, "Bread, whole-wheat, commercially prepared, toasted".
How much protein is in toasted whole-wheat bread?: Toasted whole-wheat bread has 16.3 g of protein per 100 g and 4.1 g per 1 slice (25 g). That is 5.3 g of protein per 100 kcal — a modest protein contribution.
Where do these calorie figures come from?: USDA FoodData Central record 172689, “Bread, whole-wheat, 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 whole-wheat bread” into calorie.one and the app matches this exact record — “Bread, whole-wheat, 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?.