How many calories are in green tea?
A 250 ml mug of plain brewed green tea is about 2 kcal — close enough to zero that it will never move a daily total. The real question is whether it burns any, and the honest answer is: a little, far less than the box suggests.
Per portion
| Portion | Calories | Protein | Carbs | Fat |
|---|---|---|---|---|
| Brewed green tea, 250 ml, nothing added | ~2 kcal | 0 g | 0.5 g | 0 g |
| Green tea + 1 tsp sugar | ~18 kcal | 0 g | 4 g | 0 g |
| Green tea + 1 tsp honey (7 g) | ~23 kcal | 0 g | 6 g | 0 g |
| Matcha, 1.5 g whisked into 200 ml water | ~5 kcal | 0.5 g | 0.5 g | 0.1 g |
| Matcha latte, 350 ml, whole milk, no syrup | ~165 kcal | 8 g | 12 g | 9 g |
| Matcha latte, large (470 ml), sweetened mix | 250–350 kcal | 8–12 g | 35–50 g | 7–12 g |
| Bottled green tea, unsweetened, 500 ml | 0–5 kcal | 0 g | 0–1 g | 0 g |
| Bottled green tea, sweetened, 500 ml | 60–130 kcal | 0 g | 15–32 g | 0 g |
What changes the number
Almost nothing you do to the leaves. Steeping time, water temperature, a second infusion, loose leaf versus bags, first-flush sencha versus supermarket own-brand: all of it lands between 0 and 3 kcal a cup.
Matcha is the one genuine exception, because you drink the powdered leaf rather than an infusion of it. At roughly 300 kcal per 100 g, a 1.5–2 g serving is 5–6 kcal. Still trivial — until it meets milk.
Sweetened matcha mixes are where the number actually comes from. Café and supermarket “matcha latte powder” is frequently sugar first and matcha second; a 20–25 g sachet is 80–100 kcal before any milk goes in. Check the ingredient order and the per-serving column rather than the claim on the front, which is true of any food label.
Everything else added behaves exactly as it does in ordinary tea: sugar about 16 kcal a teaspoon, honey about 21, milk 35–64 kcal per 100 ml by type. Lemon, mint and ginger are nil.
Where it fits in a deficit
Green tea is close to ideal in a deficit for dull reasons: free, warm, repeatable, and it occupies the slot something sweeter used to. Displace a 200 kcal sweetened iced tea twice a day and that is 400 kcal — the displacement, not the tea, did it.
Caffeine is 20–45 mg a cup, roughly half a coffee, so six of them do not wreck the evening. It does not fill you up, though; no near-zero-calorie drink does much for hunger.
The metabolism claim, honestly
The mechanism is real. Green tea catechins, mainly EGCG, together with caffeine appear to raise thermogenesis and fat oxidation modestly, probably by slowing the breakdown of noradrenaline. This is not marketing invention.
The size is the problem. Controlled trials — usually at extract doses equivalent to several cups a day — tend to find 24-hour energy expenditure up by 1–4%, which for most people is 20–100 kcal a day. A good number of trials find no significant effect at all, and the response looks smaller in habitual caffeine drinkers, who are most of the people buying it.
On weight, pooled analyses of green tea trials cluster around differences under 1–1.5 kg (2–3 lb) over about twelve weeks, frequently not statistically significant, and usually at catechin doses a cup of tea does not deliver.
Put 50 kcal a day next to maintenance calories of 2,000–2,500 and it is 2%: smaller than the error in almost anyone’s estimate of what they ate. Green tea does not create a calorie deficit and will not rescue one. It also will not block one, so there is no reason to stop drinking it — just buy it as a drink rather than as a fat burner.
One factual aside: concentrated green tea extract supplements deliver many times a cup’s catechin dose, and have been linked in rare cases to liver injury. Brewed tea has no such record.
Figures are typical values and vary by variety, size and preparation. General information, not medical advice.