Hazelnuts are a heart-healthy, satisfying snack, but they are not carb-free. A 100 g portion of raw hazelnuts contains about 16.7 g of total carbohydrates: roughly 9.7 g of fiber, 4.3 g of sugar, and about 7 g of net carbs. That makes portion size the single most important factor when you are tracking your daily carbohydrate intake.
This calculator converts your serving into grams and then estimates total carbs, net carbs, fiber, and sugars. Enter your amount in grams, ounces, cups, tablespoons, or a typical handful, and the tool does the conversion for you. An optional daily carb budget shows what percentage of your target a serving uses, which is handy for keto, diabetic, or low-carb meal planning.
Use the presets for common portions, or type in the exact amount from your kitchen scale. The results update with a clear breakdown so you can log your food with confidence.
Estimate total carbs, net carbs, fiber, and sugars for any amount of hazelnuts.
How to Use This Tool
Start by entering the amount of hazelnuts you plan to eat in the Amount field. The unit dropdown lets you switch between grams, ounces, whole cups, chopped cups, tablespoons, or a typical handful. If you prefer quick portions, tap a preset button to fill the field automatically.
Use the optional daily carb budget if you are following a specific macro plan. Enter your target in grams and the calculator will show what percentage of that budget a serving uses. Tick the Show net carbs box to subtract fiber from total carbs, which is common for low-carb and ketogenic eating.
The calculator assumes raw, dry hazelnuts. If your product has added sugar, oil, chocolate, or honey, check the package label and add those extra carbs separately.
The Calculation Method
All results are based on values from USDA FoodData Central for raw hazelnuts per 100 grams:
- Total carbohydrate: 16.7 g
- Dietary fiber: 9.7 g
- Sugars: 4.3 g
- Net carbs: 7.0 g (total carbs minus fiber)
The tool first converts your chosen unit to grams, then applies those percentages. For example, 50 g of hazelnuts contains 50 × 16.7 / 100 = 8.35 g of total carbohydrates and 50 × 9.7 / 100 = 4.85 g of fiber, so its net carbs are 8.35 − 4.85 = 3.50 g.
Worked Examples
Example 1: A 1-ounce snack (28 g). Total carbs = 28 × 0.167 = 4.68 g. Fiber = 28 × 0.097 = 2.72 g. Net carbs = 1.96 g. That is a small but real carbohydrate load, most of it as fiber.
Example 2: A full cup of chopped hazelnuts (115 g). Total carbs = 19.21 g, fiber = 11.16 g, net carbs = 8.05 g. This is a much larger portion than a handful, which is why weighing nuts is so important.
Example 3: Half a cup of whole hazelnuts (72.5 g). Total carbs = 12.11 g, fiber = 7.03 g, net carbs = 5.08 g.
Reference Values for Common Portions
| Portion | Total carbs | Fiber | Net carbs | Sugars |
|---|---|---|---|---|
| 100 g | 16.7 g | 9.7 g | 7.0 g | 4.3 g |
| 1 oz (28 g) | 4.7 g | 2.7 g | 2.0 g | 1.2 g |
| Handful (30 g) | 5.0 g | 2.9 g | 2.1 g | 1.3 g |
| ½ cup whole (72.5 g) | 12.1 g | 7.0 g | 5.1 g | 3.1 g |
| 1 cup chopped (115 g) | 19.2 g | 11.2 g | 8.1 g | 4.9 g |
Numbers are rounded to one decimal place; the calculator uses the full per-gram values.
Tips for Low-Carb and Keto Diets
Hazelnuts are a good keto-friendly nut because a typical 28 g serving contains only about 2 g net carbs while supplying around 17 g fat and 4 g protein. Still, they are energy-dense: roughly 628 kcal per 100 g, so portion control matters even on low-carb plans.
Weigh your nuts instead of using volume measures. A handful can range from 20 g to 40 g depending on hand size, and that difference changes net carbs by about 1.4 g.
If you are comparing snack options, our avocado carb calculator shows another high-fat, low-carb food with a very different carb profile. For mixed nut blends, the trail mix net carb calculator can help you account for extras like dried fruit and seeds.
Frequently Asked Questions
Are hazelnuts keto-friendly? Yes. With roughly 2 g net carbs per ounce, they fit comfortably into most ketogenic diets when eaten in a controlled portion. Avoid honey-roasted or chocolate-covered varieties, which add sugar.
Why subtract fiber to get net carbs? Fiber is a carbohydrate that is not digested into glucose. Many people track net carbs because fiber does not raise blood sugar the same way as starch and sugar. This makes sense for some diets, but if you are counting for medical meal plans, ask your dietitian which method is best.
Do roasted hazelnuts have different carb counts? Dry roasted hazelnuts have essentially the same carb value as raw nuts. Oil-roasted nuts may add a small amount of fat, not carbs. Flavored nuts can have significant added sugar, so always check the label.
Can I use this tool for hazelnut butter? Plain hazelnut butter has a similar carb profile per gram, but commercial spreads often contain sugar and cocoa. Use this calculator for plain nuts only, then add any extra carbohydrates listed on the spreads nutrition label.
For setting daily targets, the nutrition target calculator can help you build a balanced macro plan around your calculated carb intake.