A typical serving of green tea (1 cup (8 fl oz), 245 g) has about 2 calories. Per 100 g: 1 kcal, 0.2 g protein, 0 g carbs, 0 g fat. Portions scale in a straight line, so half the weight means half the calories. In a daily log it contributes close to nothing.
| Serving | Weight | Calories |
|---|---|---|
| 1 cup (8 fl oz) | 245 g | 2 kcal |
| 100 g | 100 g | 1 kcal |
Brewed green tea is essentially water with flavor: about 1 calorie per cup. On the energy-density scale, 1 kcal per 100 g puts green tea at the very low end. Protein density is strong: about 20.0 g of protein per 100 calories.

A typical serving (1 cup (8 fl oz), 245 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 0.2 g of protein in 100 g of green tea, which works out to about 0.5 g per serving (1 cup). Treat it as an energy source rather than a protein source.
Yes. Carbohydrate is 0 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 171917 (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 171917 (SR Legacy). Serving calories are computed from the per-100-g values.