Part of our Alpha GPC & NeuroMatcha guide library.
Short answer: To brew green tea, use water that has cooled to about 175 to 185°F (80 to 85°C), not boiling, and steep for 1 to 3 minutes: one bag or about a teaspoon or two of leaves per 8-ounce cup. In a lab taste test, green tea brewed at 85°C for 3 minutes scored highest, while very long, hot steeps turned bitter (Saklar et al., 2015). Delicate Japanese teas such as sencha suit even cooler water and shorter steeps.
Green tea tastes sweet, grassy and smooth when it is brewed well, and bitter when it is brewed with boiling water or left to steep too long. Here is how to brew green tea with tea bags or loose leaves, the right water temperature and steep time for each type, how to make iced and cold-brew green tea, and simple fixes if your green tea tastes bitter.
What you'll learn
- The right water temperature and steep time for green tea
- How to brew green tea bags and loose-leaf tea, step by step
- How to brew sencha, gyokuro, genmaicha and other Japanese green teas
- How to make iced and cold-brew green tea, and why green tea tastes bitter
Green tea brewing guide at a glance
| Tea | Water temperature | Steep time | Source |
|---|---|---|---|
| Green tea bags | 175–185°F (80–85°C) | 2–3 minutes | Saklar et al., 2015 |
| Loose-leaf green tea | 175–185°F (80–85°C) | 1–3 minutes | Saklar et al., 2015 |
| Sencha | 158–194°F (70–90°C) | 1–2 minutes (first steep) | Unno et al., 2026 |
| Gyokuro | About 140°F (60°C) | About 2 1/2 minutes | MEXT Japan |
| Genmaicha, hojicha, bancha | About 194°F (90°C) | About 30 seconds | MEXT Japan |
| Cold-brew green tea | Cold water, in the refrigerator | Several hours or overnight | Yang et al., 2007 |
The Japanese tea conditions are the brewing methods used in Japan's official food composition tables. Start in the middle of each range and adjust to taste.
What water temperature is best for green tea?
About 175 to 185°F (80 to 85°C) suits most green tea, which is hot but well below boiling (212°F, or 100°C). In a study of brewing conditions, green tea steeped at 85°C for 3 minutes had the most of its main catechin, EGCG, and the highest taste scores (Saklar et al., 2015). Hotter water pulls out more caffeine and catechins (Yang et al., 2007), which is why boiling water tends to make green tea taste harsher.
No thermometer? Many electric kettles have a green tea setting. Otherwise, bring the water to a boil, take it off the heat and let it stand for a few minutes before pouring, or pour it into your cup first and then into the teapot, which cools it a little.
How long should you steep green tea?
Steep most green tea for 1 to 3 minutes. Taste scores in the 2015 study were highest at 3 and 5 minutes, and very long steeps of 30 to 45 minutes in hot water were rated poorly because of their bitter taste and dark color (Saklar et al., 2015). For Japanese sencha, researchers recommend 2 minutes or less for the first steep, because most of the caffeine and theanine come out within about 1.5 minutes (Unno et al., 2026).
Steeping longer does not just make tea stronger. It also pulls out more of the compounds that make tea bitter and astringent, so if you want a stronger cup, add more tea rather than steeping much longer.
How do you brew green tea with a tea bag?
Steep one green tea bag in 8 ounces of water at about 175 to 185°F (80 to 85°C) for 2 to 3 minutes, then remove the bag.
- Heat the water to about 175 to 185°F (80 to 85°C), or let boiled water cool for a few minutes.
- Add one tea bag to an 8-ounce mug, or follow the amount on the box.
- Pour the water over the bag and steep for 2 to 3 minutes.
- Remove the bag and taste. Next time, steep a little shorter if it is bitter, or use a second bag if it is weak.
How do you brew loose-leaf green tea?
Brew loose-leaf green tea with about 1 to 2 teaspoons of leaves per 8-ounce cup and water at 175 to 185°F (80 to 85°C) for 1 to 3 minutes. Then strain completely and re-steep the leaves for a second cup.
- Measure the leaves. Use about 1 to 2 teaspoons per 8-ounce cup. Japan's food tables brew sencha with 10 grams of leaves per 430 mL of water (MEXT Japan), which works out to about 5 grams for an 8-ounce cup by our calculation, so use more for a rich cup and less for a light one.
- Warm the teapot with a splash of hot water, then pour it out.
- Add the leaves and water at about 175 to 185°F (80 to 85°C), and steep for 1 to 3 minutes.
- Strain completely. Pour out every drop so the leaves do not keep steeping in the pot.
- Re-steep the leaves. Good loose-leaf green tea makes two or three cups. In one study, the second cup made from sencha leaves brought the total caffeine and theanine released to about 80% (Unno et al., 2026).
How do you brew Japanese green tea?
Japanese green teas vary more than most, so match the water to the tea. Sencha is generally brewed at 70 to 90°C (158 to 194°F) for 1 to 2 minutes; use the cooler end for delicate, first-harvest sencha (Unno et al., 2026). Japan's food tables brew gyokuro, a shaded tea, with much cooler water, 60°C (140°F), for 2 1/2 minutes, and roasted or toasted teas such as hojicha and genmaicha with near-boiling 90°C water for only 30 seconds (MEXT Japan).
Learn more in our guides to sencha, genmaicha and hojicha. Matcha is different: it is a powder that you whisk into water rather than steep, so see how to make matcha.
How do you make iced and cold-brew green tea?
Iced green tea: brew the tea about twice as strong, using twice the leaves or bags with the usual steep time, then pour it over a glass full of ice. Brewing double-strength keeps the tea from tasting watery as the ice melts.
Cold-brew green tea: add 2 tea bags or about 2 tablespoons of loose leaves to 4 cups of cold water, cover and refrigerate for several hours or overnight, then strain. Cold water releases caffeine and catechins much more slowly than hot water (Yang et al., 2007), so cold-brew green tea tastes smoother and milder. In the same study, brewed tea kept in the refrigerator showed no clear change in catechins over 48 hours, while tea left at room temperature lost catechins after 36 hours (Yang et al., 2007). Keep iced and cold-brew tea refrigerated and drink it within a day or two.
Why does my green tea taste bitter?
Usually because the water was too hot or the tea steeped too long. Both pull out more catechins and other astringent compounds (Yang et al., 2007; Saklar et al., 2015). Try these fixes:
- Cool the water to about 175°F (80°C), or lower for sencha and gyokuro.
- Shorten the steep to 1 to 2 minutes, and remove the bag or strain the leaves completely.
- Use soft or filtered water. Hard water changes how much catechin and caffeine end up in the cup (Unno et al., 2026).
- Use fresh tea. Store green tea in an airtight container away from light, heat and strong smells.
- Add a little flavor if you like: a slice of lemon, a few mint leaves or a small spoon of honey.
How much caffeine is in a cup of green tea?
A cup of brewed green tea has about 29 mg of caffeine, by our calculation from USDA data, compared with about 95 mg in an 8-ounce cup of brewed coffee (USDA; USDA). The amount goes up with hotter water, longer steeping and more leaves (Yang et al., 2007), so a short, cooler steep gives a gentler cup. Matcha has more because you drink the whole leaf; one serving of NeuroMatcha, our mushroom matcha, has 17.64 mg (Product Facts).
NCCIH reports no safety concerns for green tea drunk as a beverage by adults, but it does contain caffeine (NCCIH), and the FDA cites 400 mg a day for most healthy adults (FDA). See how much caffeine is in tea for a full comparison.
Common myths (quick reality check)
Myth: You should brew green tea with boiling water. Reality: Boiling water tends to make green tea bitter. About 175 to 185°F (80 to 85°C) suits most green tea, and Japanese teas often need even cooler water.
Myth: Steeping longer makes green tea stronger and better. Reality: Longer steeps mainly add bitterness. For a stronger cup, use more tea rather than steeping much longer.
Myth: Green tea leaves can only be used once. Reality: Good loose-leaf green tea can be steeped two or three times. The second cup is often just as good, with a shorter steep.
Frequently asked questions (FAQ)
How long should you steep green tea?
Usually 1 to 3 minutes. Tea bags need about 2 to 3 minutes, and Japanese sencha 2 minutes or less for the first steep.
What temperature should water be for green tea?
About 175 to 185°F (80 to 85°C) for most green tea. Sencha does well at 158 to 194°F (70 to 90°C), and gyokuro at about 140°F (60°C).
Can you use boiling water for green tea?
You can, but it usually makes green tea taste more bitter. Let boiled water cool for a few minutes first. Roasted teas such as hojicha and genmaicha handle near-boiling water.
How much green tea should I use per cup?
About one tea bag or 1 to 2 teaspoons of loose leaves per 8-ounce cup. Use more for a stronger cup instead of steeping longer.
How do you make green tea taste better?
Use cooler water, steep for a shorter time, use soft or filtered water and fresh tea, and add lemon, mint or a little honey if you like.
Can you re-steep green tea leaves?
Yes. Loose-leaf green tea can usually be steeped two or three times. Later steeps need only a short time.
How do you make cold-brew green tea?
Add 2 tea bags or about 2 tablespoons of loose leaves to 4 cups of cold water, refrigerate for several hours or overnight, then strain.
How much caffeine is in green tea?
About 29 mg in a cup of brewed green tea, by our calculation from USDA data, compared with about 95 mg in an 8-ounce cup of coffee.
Related guides
- matcha vs green tea
- What is sencha?
- How much caffeine is in tea?
- How to make matcha
- What is genmaicha?
- L-theanine and caffeine
Disclaimer and when to seek help
This article is for general education and is not medical advice. These statements have not been evaluated by the Food and Drug Administration. Our products are not intended to diagnose, treat, cure, or prevent any disease. Talk to your health care provider about green tea or caffeine if you are pregnant, trying to become pregnant or breastfeeding, have a heart condition, anxiety or liver problems, or take medication, because green tea can interact with some medicines.
References
- Saklar S, Ertas E, Ozdemir IS, Karadeniz B. "Effects of different brewing conditions on catechin content and sensory acceptance in Turkish green tea infusions." Journal of Food Science and Technology, 2015;52(10):6639-6646. doi:10.1007/s13197-015-1746-y
- Yang DJ, Hwang LS, Lin JT. "Effects of different steeping methods and storage on caffeine, catechins and gallic acid in bag tea infusions." Journal of Chromatography A, 2007;1156(1-2):312-320. doi:10.1016/j.chroma.2006.11.088
- Unno K, Kameoka Y, Nakamura Y. Molecules, 2026;31(16):2934. doi:10.3390/molecules31162934
- Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan. Standard Tables of Food Composition in Japan 2020 (Eighth Revised Edition).
- U.S. Department of Agriculture. FoodData Central: green tea, brewed (FDC 171917) and brewed coffee (FDC 171890).
- National Center for Complementary and Integrative Health. Green Tea: Usefulness and Safety. Last updated February 2025.
- U.S. Food and Drug Administration. "Spilling the Beans: How Much Caffeine Is Too Much?" Content current as of August 28, 2024.
