A typical serving of sugar (1 tsp, 4 g) has about 16 calories. Per 100 g: 387 kcal, 0 g protein, 100 g carbs, 0 g fat. The same 100 g carries 99.8 g of sugar. Most of the energy comes from carbohydrate.
| Serving | Weight | Calories |
|---|---|---|
| 1 tsp | 4 g | 16 kcal |
| 1 tbsp | 13 g | 49 kcal |
| 1 cup | 200 g | 774 kcal |
| 100 g | 100 g | 387 kcal |
Pure sucrose: 16 calories per teaspoon, wherever it lands. On the energy-density scale, 387 kcal per 100 g puts sugar at the high end.
A typical serving (1 tsp, 4 g) has about 16 calories, and 100 g has 387 kcal. Calories scale with weight, so double the portion means double the number.
There are 0 g of protein in 100 g of sugar, which works out to about 0 g per serving (1 tsp). Treat it as an energy source rather than a protein source.
Sugar comes to 99.8 g per 100 g, so 1 tsp (4 g) delivers roughly 4 g. That sugar is already counted inside the calorie figures on this page.
Every value on this page comes from USDA FoodData Central, entry 169655 (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 169655 (SR Legacy). Serving calories are computed from the per-100-g values.
