Is green tea hydrating or dehydrating?

Hydrating. Green tea's modest caffeine (~25–35 mg per cup) causes only a slight diuretic effect, giving it a hydration value around 0.9–0.95 versus water at 1.0.

Do herbal teas hydrate as well as water?

Yes — caffeine-free herbal and fruit infusions are effectively flavored water and hydrate at full value.

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Does Tea Count as Water Intake?

Q: Does tea count as water intake?

Yes. Tea is over 99% water and counts toward daily fluid goals. Caffeinated teas hydrate at roughly 85–95% the value of plain water; herbal teas hydrate essentially the same as water.

Quick answer: Yes — tea counts toward your daily water intake. Tea is over 99% water, and hydration research gives caffeinated tea a Beverage Hydration Index of about 0.85–0.95 versus 1.0 for water. Herbal (caffeine-free) teas hydrate essentially like water. A 250 ml mug of black tea contributes roughly 212–237 ml of effective hydration.

Tea is (almost) water — with an asterisk

A brewed cup of tea is more than 99% water, and the British Dietetic Association and NHS both count tea toward daily fluid targets. The asterisk is caffeine: black tea carries ~40–50 mg per cup and green tea ~25–35 mg, enough for a mild diuretic effect in people who aren't habituated.

In the Beverage Hydration Index study (Maughan et al., 2016, American Journal of Clinical Nutrition), hot tea's fluid retention was statistically similar to still water, sitting in the ~0.85–0.95 range once caffeine's mild effect is accounted for. In practice:

Tea type	Caffeine (250 ml)	Hydration value
Herbal / rooibos / fruit infusions	0 mg	≈ 1.0 — same as water
Green tea	~25–35 mg	≈ 0.9–0.95
Black tea	~40–50 mg	≈ 0.85–0.95
Matcha	~60–70 mg	≈ 0.85–0.9

Is tea better than coffee for hydration?

Slightly, on average — most teas contain half the caffeine of coffee or less, so the diuretic effect is smaller. Both count toward your goal; both are less efficient than plain water or electrolyte drinks. (Full coffee breakdown: does coffee count as water intake?)

What about sugar in tea?

Sweetened and milk teas add sugar that plain water doesn't. High-sugar drinks concentrate in the gut before absorbing, and the calories add up fast in bubble tea or sweet iced tea. SupaHydrate automatically tracks the sugar in every logged drink alongside caffeine, sodium, and potassium, and warns you as you approach daily limits.

Tracking tea the smart way

In SupaHydrate, tea is a first-class drink type — even on the free plan:

Log a mug in one tap (or from your Apple Watch, a widget, or via Siri).
The app applies tea's Beverage Hydration Index, so your progress ring reflects real hydration, not just volume.
Caffeine from tea is totaled with coffee so your daily caffeine picture is complete.
Your Hydration Efficiency score shows whether your tea habit is helping or whether you need more plain water.

Track tea, coffee & water — freeSupaHydrate's free plan includes water, tea, and coffee tracking with smart reminders and true-hydration math.

Bottom line

Drink your tea — it genuinely hydrates. Count caffeinated cups at roughly 90% of their volume, herbal cups at full value, and keep an eye on added sugar. Or let the app do all three automatically.

Sources: Maughan et al., American Journal of Clinical Nutrition (2016); Ruxton & Hart, "Black tea is not significantly different from water in the maintenance of normal hydration," British Journal of Nutrition (2011); NHS — Water, drinks and hydration.