Figuring out how many calories are in 100 grams of a “white” food can be confusing because the term covers everything from steamed white rice and fluffy bread to white beans, potatoes, mushrooms, and even white chocolate. Each has a very different energy density — 22 kcal per 100g for raw white mushrooms versus 539 kcal per 100g for white chocolate. This calculator takes the guesswork out of portion math.
Choose a food from the list, enter your serving size in grams or ounces, and the tool returns total calories plus protein, carbohydrate, and fat for that exact portion. It also shows the per-100g reference values, making it easy to compare foods and log accurate entries in your calorie-tracking app.
Whether you’re meal-prepping rice, slicing bread for sandwiches, or counting macros on a fitness plan, this quick nutrition calculator helps you stay consistent with your daily goals.
🍚 White Food Calorie Calculator
Calories, protein, carbs, and fat per 100g — scaled to your exact portion.
Enter an amount and press Calculate.
Quick Start
This calculator makes portion math effortless for the most common “white” foods — rice, bread, potatoes, beans, mushrooms, sugar, and white chocolate. Start by selecting a food from the dropdown. Every option lists its energy density in kcal per 100 g, so you can see at a glance whether you're dealing with a low-energy food like raw mushrooms or a calorie-dense one like white chocolate. Next, type your portion weight in grams or ounces. The calculator converts ounces to grams using the standard factor 1 oz = 28.3495 g before applying the nutrient scaling.
Press Calculate and the result panel displays total calories, protein, carbohydrates, and fat for your exact portion, plus a per-100 g reference line and the formula used to scale it. You can also use the quick-amount buttons (100 g, 150 g, 200 g, 250 g) to fill a common serving size instantly, then tweak the number if needed. The Copy result button copies a plain-text summary to your clipboard, handy for pasting into a food diary or macro tracker.
The Math Behind It
Every food in the list has a fixed nutrient profile per 100 g, drawn from typical USDA FoodData Central values. To scale those values to your portion, the calculator uses one simple factor:
factor = portion weight in grams ÷ 100
Then every nutrient is multiplied by that factor:
- Calories = factor × kcal per 100 g
- Protein = factor × protein per 100 g
- Carbohydrates = factor × carbs per 100 g
- Fat = factor × fat per 100 g
For example, if your portion is 150 g, the factor is 1.5. If the food provides 130 kcal per 100 g, your portion provides 1.5 × 130 = 195 kcal. The macros scale the same way. If you enter ounces, the tool first converts to grams with 1 oz = 28.3495 g, so a 5 oz portion becomes 141.75 g and the factor is 1.4175.
Worked Examples
Example 1: Cooked white rice. Cooked white rice contains about 130 kcal, 2.7 g protein, 28.2 g carbs, and 0.3 g fat per 100 g. A typical 150 g serving works out to 1.5 × 130 = 195 kcal, 4.1 g protein, 42.3 g carbs, and 0.5 g fat. If you log rice into an app by cooked weight, this is the number to enter.
Example 2: White bread slice. A medium slice of white bread weighs about 30–35 g. For a 35 g slice using 265 kcal per 100 g, the factor is 0.35, so the slice provides 0.35 × 265 = 92.8 kcal, 3.2 g protein, 17.2 g carbs, and 1.1 g fat. Two slices nearly double that — about 186 kcal total.
Example 3: White chocolate. White chocolate is the densest item on the list at 539 kcal per 100 g. A small 20 g indulgence contains 0.2 × 539 = 107.8 kcal, 1.2 g protein, 11.8 g carbs, and 6.4 g fat. That's over a quarter of the calories of a full 150 g rice portion in a fraction of the weight.
Reference Values
The values below are typical approximations for each food in the state indicated (raw, cooked, boiled, or processed). They come from general nutrition databases such as USDA FoodData Central; packaged products may vary by brand and recipe.
| Food | kcal / 100 g | Protein (g) | Carbs (g) | Fat (g) |
|---|---|---|---|---|
| White mushrooms, raw | 22 | 3.1 | 3.3 | 0.3 |
| Egg white, raw | 52 | 10.9 | 0.7 | 0.2 |
| White potato, boiled | 87 | 1.9 | 20.1 | 0.1 |
| White rice, cooked | 130 | 2.7 | 28.2 | 0.3 |
| White beans, boiled | 139 | 9.7 | 25.0 | 0.4 |
| White bread | 265 | 9.0 | 49.0 | 3.2 |
| White rice, raw | 365 | 7.1 | 80.0 | 0.7 |
| White sugar | 387 | 0.0 | 100.0 | 0.0 |
| White chocolate | 539 | 5.9 | 59.2 | 32.1 |
Raw white rice and cooked white rice are listed separately because cooking water changes both weight and nutrient density. The calculator uses cooked values when you pick “White rice, cooked” and raw values when you pick “White rice, raw.”
Tips & Common Mistakes
- Cooked vs. raw weight: White rice roughly triples in weight when cooked. If you weigh 100 g of dry rice, you'll end up with about 300 g cooked. The calculator's “raw” value is for the dry grain; the “cooked” value is for steamed or boiled rice. Don't mix them up.
- Use a kitchen scale: Digital scales are cheap and far more accurate than measuring cups. Spooned flour in a cup can vary by 20–30% depending on how it's packed.
- Check the package: Bread slices vary widely by bakery, from 25 g light slices to 50 g artisan slices. White chocolate bars also differ in sugar and cocoa butter content. If a nutrition label is available, use those exact numbers instead of the averages here.
- Log before cooking: For foods that absorb water, log the raw weight whenever possible. But if you're batch-cooking, it's often easier to weigh the cooked output and use the cooked per-100 g values. Just be consistent.
- Don't add butter or oil: These values are for the plain food. A pat of butter or a drizzle of oil can add 50–100 kcal, so account for toppings and cooking fats separately.
💡 If you're tracking macros, use this tool to pre-calculate the numbers for your most common serving sizes — a measured 200 g rice bowl, one 40 g bread slice, a 15 g chocolate square. Write them down or save them in your app so logging takes seconds later.
Limitations & Accuracy Notes
Nutrient values are approximations based on published databases and can vary with variety, growing conditions, cooking method, and moisture content. Boiled potatoes, for instance, change slightly depending on how much water they absorb. Processed foods like white bread and white chocolate can differ meaningfully between brands, so the figures here are best used as planning estimates rather than medical or dietary prescriptions.
The calculator assumes a constant nutrient density per 100 g, which is exact for homogeneous foods like sugar but only approximate for items with variable water content. If you need clinical accuracy, weigh your food and consult the USDA FoodData Central database for the specific product or use the nutrition label on the package. For more on food energy databases, see USDA FoodData Central.