Dark chocolate is rich in iron, magnesium and copper and contains caffeine and theobromine, but all chocolate is calorie-dense. A typical 100 g bar has 530–600 kcal – about a quarter to a third of an adult’s daily energy needs.
How to use the Chocolate Calculator
- Chocolate type
- Piece
- Custom piece weight
- Number of pieces
Results update as you type, and every field accepts the units shown in its menu.
How it works
Choose the chocolate type and piece size, and enter how many pieces (or the weight).
Inputs explained
| Field | What to enter |
|---|---|
| Chocolate type | Choose one: Dark chocolate (70–85%), Milk chocolate, White chocolate |
| Piece | Choose one: Standard bar 100 g (3.5 oz), Row of a 100 g bar (20 g), Square of a 100 g bar (6.7 g), 1 oz piece (28 g) … |
| Custom piece weight | In g |
| Number of pieces | A number |
Example values
How the main result changes when Custom piece weight changes and everything else stays at the example values above:
| Custom piece weight (g) | Calories (kcal) |
|---|---|
| 15 | 598 |
| 22.5 | 598 |
| 30 | 598 |
| 37.5 | 598 |
| 45 | 598 |
| 60 | 598 |
Formula
Nutrient = value per 100 g × weight ÷ 100
Weight = number of pieces × piece weight
% Daily Value = nutrient ÷ FDA daily value
Worked example
Inputs — Chocolate type: Dark chocolate (70–85%); Piece: Standard bar 100 g (3.5 oz); Number of pieces: 1.
Results — Total weight = 100 g; Calories = 598 kcal; Fat = 42.6 g; Sugars = 24 g; Protein = 7.8 g; Caffeine = 80 mg; Iron (% Daily Value) = 66 %; Magnesium (% Daily Value) = 54 %; Copper (% Daily Value) = 200 %; Fat (% Daily Value) = 55 %.
Frequently asked questions
How many calories are in a chocolate bar?
About 530–600 kcal per 100 g; a 44 g US bar has about 230 kcal.
Does dark chocolate contain caffeine?
Yes – roughly 20–40 mg per 1 oz (28 g) of 70–85% dark chocolate.
Is dark chocolate healthy?
In small amounts it provides minerals and antioxidants, but it is high in calories and fat.