A typical serving of walnuts (1 oz (14 halves), 28 g) has about 185 calories. Per 100 g: 654 kcal, 15.2 g protein, 13.7 g carbs, 65.2 g fat. The same 100 g carries 6.7 g of fiber and 2.6 g of sugar. Most of the energy comes from fat.
| Serving | Weight | Calories |
|---|---|---|
| 1 oz (14 halves) | 28 g | 185 kcal |
| 1 cup, chopped | 117 g | 765 kcal |
| 100 g | 100 g | 654 kcal |
The fattiest common nut, and the one richest in plant omega-3s. On the energy-density scale, 654 kcal per 100 g puts walnuts at the very high end. Fiber is the standout at 6.7 g per 100 g, which slows a portion down more than the calorie count suggests.
A typical serving (1 oz (14 halves), 28 g) has about 185 calories, and 100 g has 654 kcal. Calories scale with weight, so double the portion means double the number.
There are 15.2 g of protein in 100 g of walnuts, which works out to about 4.3 g per serving (1 oz). Treat it as an energy source rather than a protein source.
Yes, in the plain arithmetic sense: 65.2 g of fat per 100 g supplies about 90% of the calories. Whether that fits your day depends on your totals, not on the food alone.
Every value on this page comes from USDA FoodData Central, entry 170187 (SR Legacy). Serving figures are converted from the per-100-g data, so rounding can shift a total by a calorie or two.
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Get JoulesA note on accuracy: calculators like this one provide estimates based on population-level formulas — your real needs vary with genetics, muscle mass, medical conditions, and more. Results are for information only and are not medical advice, a diagnosis, or a prescription. Talk to a doctor or registered dietitian before making significant changes to your diet or exercise, especially if you have a health condition, are pregnant, or are under 18.
Nutrition data: USDA FoodData Central, FDC ID 170187 (SR Legacy). Serving calories are computed from the per-100-g values.
