How Many Cups of Tea a Day Are Safe

The short answer: for a healthy adult, 3–5 cups a day is a good benchmark — roughly 100–250 mg of caffeine. The real limit is set not by tea but by caffeine: most regulators (EFSA, FDA) consider up to 400 mg per day safe for adults, with no more than 200 mg in a single sitting. In tea terms that's roughly 6–8 ordinary cups — with caveats for strength, tea type, and brewing method.

How much caffeine is in one cup?

The range is wide: 20 to 70 mg per 200 ml, depending on the tea type, amount of leaf, water temperature, and steeping time. As a rough guide: green tea 25–45 mg, white 20–40 mg, oolong 30–50 mg, red tea 40–70 mg, pu-erh 30–60 mg. The spread within each category is bigger than the spread between them — the specifics, and what drives them, are in the "Caffeine in Tea" guide.

How do you count gongfu infusions?

This is a common source of confusion. In gongfu brewing you use 5–7 g of leaf per 100–150 ml and make 8–12 infusions — but you drink small cups, and in total you extract the caffeine from those same 5–7 g. The practical approach: count leaf portions, not cups. One 5–7 g portion is roughly 100–150 mg of caffeine spread across the whole session — the equivalent of two or three "Western" cups. Two or three sessions a day already puts many people near the upper edge of comfort.

Who needs less?

Pregnant women — the benchmark is stricter, usually up to 200 mg of caffeine per day (more in the "Tea During Pregnancy and for Children" guide); people with hypertension, arrhythmia, anxiety disorders, or insomnia; anyone taking medications that interact with caffeine; those prone to anemia — for them the point is less about total volume and more about keeping tea away from meals; children and teenagers — substantially less, adjusted for body weight.

How do you know you've overdone it?

The signs are recognizable: a racing heart, trembling hands, anxiety out of nowhere, trouble falling asleep, an evening headache, heartburn. A separate story is tea drunkenness: weakness, sweating, and dizziness right in the middle of a session, most often from strong sheng on an empty stomach. It's not dangerous, but it is a signal to stop and eat something.

How to drink more tea with less caffeine?

Several tricks that work. Shift toward low-caffeine teas: aged white, shu pu-erh, GABA oolong. Use cold brewing — it extracts noticeably less caffeine. Reduce the amount of leaf rather than lengthening the steep. And move strong teas to the first half of the day, leaving gentle ones for the evening — the logic is laid out in detail in the "Tea in the Evening" guide.

Questions and answers

How much tea per day is safe?

For a healthy adult, 3–5 cups — comfortably within the recommended limit of 400 mg of caffeine per day.

Can you drink tea all day instead of water?

Tea hydrates as well as water at moderate strength — the diuretic effect of caffeine at these doses is negligible. But keep track of your total caffeine and don't rely on strong tea alone.

How many cups of tea is 400 mg of caffeine?

Roughly 6–10 ordinary cups, depending on the type and strength. Strong red tea reaches the limit faster than green.

How many cups is a gongfu session?

Count by the leaf: a 5–7 g portion is roughly 2–3 ordinary cups in caffeine content, regardless of the number of infusions.