Whether you're tracking macros, managing diabetes, or just curious about your sandwich's nutritional footprint, this bread nutrition calculator gives you a clear breakdown of calories and macronutrients in any serving size. It covers common breads like white, whole wheat, sourdough, rye, multigrain, brioche, gluten-free white, and pita — each with realistic per-100g nutrition values.
You can measure your serving in grams, ounces, or slices, and optionally switch to net carbs or daily-value percentages. The calculator is ideal for meal planning, calorie counting, and anyone following low-carb, high-fiber, or balanced diet plans. Simply pick a bread type, enter the amount you're eating, and get instant nutrition results with a clear step-by-step breakdown.
🍞 Choose Bread Type
⚖️ Serving Size
How the Nutrition Estimates Work
This calculator uses typical per-100g nutrition values compiled from food-composition databases and USDA reference data. Because bread is rarely standardized, the numbers represent averages for commonly sold bakery and grocery breads. The calculator converts your serving size to grams, then applies the same multiplier to every nutrient from the 100g base.
For example, if a bread shows 247 kcal per 100g and you eat 50g, you are getting about 123.5 kcal. This simple ratio is the same math used in most nutrition labels and diet apps.
| Bread (per 100g) | Calories | Protein | Carbs | Fiber | Fat |
|---|---|---|---|---|---|
| White | 265 | 9g | 49g | 2.7g | 3.2g |
| Whole wheat | 247 | 13g | 41g | 7g | 3.4g |
| Sourdough | 266 | 8g | 52g | 2.4g | 2.2g |
| Rye | 259 | 8.5g | 48g | 5.8g | 3.3g |
| Multigrain | 265 | 13g | 43g | 7g | 4.2g |
| Brioche | 360 | 9g | 48g | 1.5g | 15g |
| Gluten-free white | 250 | 4g | 48g | 2g | 5g |
| Pita | 275 | 9g | 55g | 2.2g | 1.2g |
Step-by-Step Guide
Using the calculator takes less than ten seconds:
- Select the bread type that best matches what you are eating.
- Enter the amount and choose grams, ounces, or slices. If you use slices, the calculator assumes one average slice weighs 30g; check your loaf's label for a more precise slice weight.
- Optionally check “Show net carbs” to subtract fiber from total carbohydrates, or “Show % Daily Value” to see how the serving contributes to a 2,000-calorie daily diet.
- Click Calculate Nutrition to see the full breakdown and the math behind it. Use Reset to clear the form or Copy Results to save the output.
Worked Examples
Example 1: Two slices of white bread — If one slice weighs 30g, your serving is 60g. The multiplier is 60 ÷ 100 = 0.60. White bread per 100g has 265 kcal, 9g protein, and 49g carbs, so your serving provides about 159 kcal, 5.4g protein, and 29.4g carbs.
Example 2: A 4 oz whole wheat roll — 4 oz converts to 113.4g. The multiplier is 1.134. Whole wheat per 100g has 247 kcal, 13g protein, and 41g carbs. Your roll delivers about 280 kcal, 14.7g protein, and 46.5g carbs.
Example 3: 100g sourdough with net carbs — Sourdough per 100g has 52g carbs and 2.4g fiber, so net carbs are 49.6g. This is useful if you follow a low-carb plan.
Common Mistakes to Avoid
- Assuming every slice weighs the same. Diet breads can weigh 22–25g, while thick artisan slices may exceed 50g.
- Ignoring fiber when you count carbs. For low-carb and keto plans, net carbs (total carbs minus fiber) are usually the more useful number.
- Using raw dough or bread mix nutrition values. They change after baking as water evaporates and density increases.
- Overlooking enriched breads like brioche, which contain substantially more fat and sugar than standard sandwich loaves.
Factors That Affect Accuracy
Flour blend, hydration level, fermentation time, added sweeteners, fats, seeds, and even baking method all shift the final nutrition values. Whole-grain breads typically deliver more fiber, protein, B vitamins, and minerals than refined white bread. Sourdough fermentation may make some nutrients more available and lower the glycemic response slightly, though the calorie and macro differences are usually small. USDA FoodData Central is an excellent source for brand-specific and generic bread entries.
Frequently Asked Questions
Q: How many calories are in one slice of bread?
A: For a standard 30g slice, white bread has about 80 kcal, whole wheat about 74 kcal, and brioche about 108 kcal. The exact number depends on the slice weight and recipe.
Q: What does “net carbs” mean?
A: Net carbohydrates are total carbs minus fiber. Fiber is not fully digested into blood sugar, so many people tracking low-carb diets prefer this value.
Q: Is whole wheat always the healthier choice?
A: Whole wheat and multigrain loaves usually have more fiber and micronutrients than refined white bread, but any bread can fit into a balanced diet when portions are reasonable.
For even more detailed macronutrient comparisons, see this wheat calories per 100g tool or the white bread carb calculator.