How much protein is in black tea?

Black tea has 0 g of protein per 100 g and 0 g per 6 fl oz (178 g). That is 0 g of protein per 100 kcal — essentially not a protein source.

Where do these calorie figures come from?

USDA FoodData Central record 173227, “Beverages, tea, black, brewed, prepared with tap water” (SR Legacy, FDC SR Legacy 2018-04 + FNDDS 2024-10-31). Energy is USDA nutrient 1008 (Energy, kcal); protein, fat and carbohydrate are read from the same record. USDA data is in the public domain, and the FDC ID above links straight to it.

All foods

Coffee and teaUSDA SR LegacyFDC 173227

Calories in black tea

USDA FoodData Central record for “Beverages, tea, black, brewed, prepared with tap water” — per 100 g, per every USDA serving size, and next to the other coffee and tea rows.

The short answer

Black tea: 1 kcal per 100 g. 6 fl oz (178 g) is 2 kcal with 0 g of protein. Source: USDA FoodData Central record 173227, "Beverages, tea, black, brewed, prepared with tap water".

Per 100 g

Nutrient	Per 100 g	Share of energy
Energy	1 kcal	100%
Protein	0 g	0%
Fat	0 g	0%
Carbohydrate	0.3 g	100%

Black tea is 1 kcal per 100 g in USDA FoodData Central (SR Legacy). Of that energy, about 0% comes from protein, 0% from fat and 100% from carbohydrate. That works out to 0 g of protein per 100 kcal — essentially not a protein source.

Per serving

The serving sizes USDA lists for this record, priced from the per-100 g figures above. Nothing here is rounded to a “portion” — the gram weight next to each label is what the calories are computed from.

Serving	Weight	Calories	Carbs
100 g	100 g	1	0.3 g
6 fl oz	178 g	2	0.5 g
1 cup (8 fl oz)	237 g	2	0.7 g

Compared with other coffee and tea

Food	kcal / 100 g	Protein / 100 g	Per serving
Black coffee	1	0.1 g	2 kcal · 6 fl oz
Black tea	1	0 g	2 kcal · 6 fl oz

Other tables in beverages

The same numbers for the foods this one usually shares a plate — or a shopping list — with.

Questions about black tea

How many calories are in black tea?: Black tea: 1 kcal per 100 g. 6 fl oz (178 g) is 2 kcal with 0 g of protein. Source: USDA FoodData Central record 173227, "Beverages, tea, black, brewed, prepared with tap water".
How much protein is in black tea?: Black tea has 0 g of protein per 100 g and 0 g per 6 fl oz (178 g). That is 0 g of protein per 100 kcal — essentially not a protein source.
Where do these calorie figures come from?: USDA FoodData Central record 173227, “Beverages, tea, black, brewed, prepared with tap water” (SR Legacy, FDC SR Legacy 2018-04 + FNDDS 2024-10-31). Energy is USDA nutrient 1008 (Energy, kcal); protein, fat and carbohydrate are read from the same record. USDA data is in the public domain, and the FDC ID above links straight to it.

How calorie.one logs it

Type “black tea” into calorie.one and the app matches this exact record — “Beverages, tea, black, brewed, prepared with tap water” — estimates the grams, and shows the line with its USDA label. You correct the amount; the per-100 g figure is never guessed. That split between recognition and arithmetic is the whole methodology. For the numbers in context, read How accurate is calorie counting, really?.