A typical serving of black tea (1 cup (8 fl oz), 237 g) has about 2 calories. Per 100 g: 1 kcal, 0 g protein, 0.3 g carbs, 0 g fat. 1 mug (355 g) comes to 4 calories. In a daily log it contributes close to nothing.
| Serving | Weight | Calories |
|---|---|---|
| 1 cup (8 fl oz) | 237 g | 2 kcal |
| 1 mug (12 fl oz) | 355 g | 4 kcal |
| 100 g | 100 g | 1 kcal |
Plain brewed tea rounds to 2 calories a cup; it is what goes in it that counts. On the energy-density scale, 1 kcal per 100 g puts black tea at the very low end.

A typical serving (1 cup (8 fl oz), 237 g) has about 2 calories, and 100 g has 1 kcal. Calories scale with weight, so double the portion means double the number.
There are 0 g of protein in 100 g of black tea, which works out to about 0 g per serving (1 cup). Treat it as an energy source rather than a protein source.
Yes. Carbohydrate is 0.3 g per 100 g, effectively nothing, so almost all the calories come from protein and fat.
Every value on this page comes from USDA FoodData Central, entry 173227 (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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Nutrition data: USDA FoodData Central, FDC ID 173227 (SR Legacy). Serving calories are computed from the per-100-g values.