Calories in dark chocolate (70–85%).
598 kcal per 100 g.
Dark chocolate is around 600 kcal per 100 g — the cocoa butter makes it 43% fat. A 28 g square-and-a-bit is about 170 kcal; the "healthier than milk chocolate" part is about sugar and cocoa, not calories.
Chocolate, dark, 70-85% cacao solids · SR Legacy (2018-04) · USDA FDC 170273
Nutrition for your portion
| Nutrient | Per 100 g | 100 g |
|---|---|---|
| Energy | 598 kcal | 598 kcal |
| Protein | 7.79 g | 7.79 g |
| Carbohydrates | 45.9 g | 45.9 g |
| Fat | 42.6 g | 42.6 g |
| Fibre | 10.9 g | 10.9 g |
| Sugars | 24 g | 24 g |
| Saturated fat | 24.5 g | 24.5 g |
| Sodium | 20 mg | 20 mg |
| Salt (calculated from sodium) | 0.05 g | 0.05 g |
| Vitamin A (RAE) | 2 ug | 2 ug |
| Vitamin D (D2 + D3) | Unknown | Unknown |
| Vitamin E (alpha-tocopherol) | 0.59 mg | 0.59 mg |
| Vitamin K (phylloquinone) | 7.3 ug | 7.3 ug |
| Vitamin C | Unknown | Unknown |
| Thiamin | 0.03 mg | 0.03 mg |
| Riboflavin | 0.08 mg | 0.08 mg |
| Niacin | 1.05 mg | 1.05 mg |
| Vitamin B6 | 0.04 mg | 0.04 mg |
| Folate, total | Unknown | Unknown |
| Vitamin B12 | 0.28 ug | 0.28 ug |
| Potassium | 715 mg | 715 mg |
| Calcium | 73 mg | 73 mg |
| Phosphorus | 308 mg | 308 mg |
| Magnesium | 228 mg | 228 mg |
| Iron | 11.9 mg | 11.9 mg |
| Zinc | 3.31 mg | 3.31 mg |
| Selenium | 6.8 ug | 6.8 ug |
| Iodine | Unknown | Unknown |
| Copper | 1.77 mg | 1.77 mg |
Energy comes from USDA nutrient 1008. Salt is calculated as sodium × 2.5, with unit conversion to grams. It is not a separately measured salt value.
Preparation
Dark chocolate at 70–85% cacao is 598 kcal per 100 g — 43% fat from cocoa butter, 46% carbohydrate, of which about a third is sugar. Melting it changes nothing; the fat is what makes it melt. A higher cacao percentage means less sugar and slightly more fat, so the calories per gram barely move between 70% and 85%.
Logging this food
A square from a standard bar is about 10 g and 60 kcal; USDA's ounce (28 g) is 170; a whole 100 g bar 598. Two squares after dinner is a 120 kcal habit — fine when logged, invisible when not. Chocolate-coated nuts and fruit carry both foods' calories.
Swaps and alternatives
Milk chocolate is about 535 kcal per 100 g — not lighter, just sweeter. Cocoa powder (about 230 per 100 g, 12 per tablespoon) gives the flavour without the cocoa butter. There is no low-calorie chocolate worth the name; the swap is the portion, and dark chocolate's bitterness makes a small portion easier to stop at.