How much protein is in whole-wheat bread?

Whole-wheat bread has 12.5 g of protein per 100 g and 4 g per 1 slice (32 g). That is 5 g of protein per 100 kcal — a modest protein contribution.

Where do these calorie figures come from?

USDA FoodData Central record 172688, “Bread, whole-wheat, commercially prepared” (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 172688

Calories in whole-wheat bread

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

The short answer

Whole-wheat bread: 252 kcal per 100 g. 1 slice (32 g) is 81 kcal with 4 g of protein. Source: USDA FoodData Central record 172688, "Bread, whole-wheat, commercially prepared".

Per 100 g

Nutrient	Per 100 g	Share of energy
Energy	252 kcal	100%
Protein	12.5 g	20%
Fat	3.5 g	12%
Carbohydrate	42.7 g	68%

Whole-wheat bread is 252 kcal per 100 g in USDA FoodData Central (SR Legacy). Of that energy, about 20% comes from protein, 12% from fat and 68% from carbohydrate. That works out to 5 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	252	12.5 g	3.5 g	42.7 g
1 slice	32 g	81	4 g	1.1 g	13.7 g
1 oz	28 g	72	3.6 g	1 g	12.1 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

Worth knowing

Whole-wheat bread is a few kcal lower per 100 g than white and carries about double the fiber, but a slice is a slice: the difference per sandwich is under 10 kcal.

Questions about whole-wheat bread

How many calories are in whole-wheat bread?: Whole-wheat bread: 252 kcal per 100 g. 1 slice (32 g) is 81 kcal with 4 g of protein. Source: USDA FoodData Central record 172688, "Bread, whole-wheat, commercially prepared".
How much protein is in whole-wheat bread?: Whole-wheat bread has 12.5 g of protein per 100 g and 4 g per 1 slice (32 g). That is 5 g of protein per 100 kcal — a modest protein contribution.
Where do these calorie figures come from?: USDA FoodData Central record 172688, “Bread, whole-wheat, commercially prepared” (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 “whole-wheat bread” into calorie.one and the app matches this exact record — “Bread, whole-wheat, commercially prepared” — 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?.