Tea Steep Time

What steep time actually controls

Steep time is how long leaf sits in water. Temperature and leaf mass decide how fast bitter polyphenols and caffeine move into the cup. Green tea in boiling water for 6 minutes tastes harsh for a chemistry reason, not a mystery.

This calculator returns leaf grams, water temperature, and a time window for five types. Cups scale the leaf. Temperature and minutes stay with the type.

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How to use this calculator

Pick green, black, oolong, white, or herbal. Enter cups at 240 mL each. Default is black tea and 1 cup.

Black tea returns 2.5 g leaf, 212 °F, 3 to 5 minutes. Three cups of green tea return 6 g leaf, 175 °F, 2 to 3 minutes.

If your mug is 12 fl oz, type 1.5 cups. Leaf scales. Time and temperature do not. A bigger mug still wants 3 to 5 minutes for black tea, not 8.

Packet times beat this table when the farm printed them. Use the table for unlabeled tins and for grocery bags that only say "green tea."

Sweet tea for a kid pitcher is a sugar problem, not a steep problem. Brew unsweetened, chill, then add sugar you can measure. Run those grams through the lunchbox tally if the pitcher is going in school bottles.

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Formula and the five rows

Leaf grams = grams per cup × cups. Temperature and time come from the type table. They do not scale with cups except that a big pot still needs the same water heat.

Green: 2 g per cup, 175 °F, 2 to 3 min. Black: 2.5 g, 212 °F, 3 to 5 min. Oolong: 3 g, 190 °F, 3 to 5 min. Herbal: 2.5 g, 212 °F, 5 to 7 min. White: 2 g, 175 °F, 4 to 5 min.

UK Tea & Infusions Association ranges sit in the same neighborhoods: green near 80 °C (176 °F), black near boiling, oolong 3 to 5 minutes. ISO 3103 is a laboratory cupping method (2 g per 100 mL at 100 °C for 6 minutes) used to compare teas, not a kitchen recipe for green leaf.

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Type table (matches the widget)

Herbal infusions are not Camellia sinensis. They often want a full boil and a longer steep because they have no tea tannin clock in the same way. Still pull the bag or strainer when the timer ends so the cup does not taste like wet stems.

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Water, bags, and loose leaf

A tea bag often holds about 2 g. Two bags in a large mug is closer to two cups of leaf, not one. If the mug is 12 fl oz (355 mL), treat it as 1.5 cups in this tool.

Fresh cold water has more dissolved oxygen than water that sat in a kettle. Reboiling the same pot all morning flattens black tea. That is a quality note, not a safety rule.

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Kids, sweet tea, and caffeine

Unsweetened tea has no added sugar. Sweet tea and bottled teas can dump a child's added-sugar budget in one glass. Count label grams on the lunchbox tally or label-to-teaspoons tool.

AAP caffeine guidance still applies to tea. This page does not estimate caffeine milligrams. White and green teas are not "caffeine free." Herbal chamomile is a different plant and is usually caffeine free, but flavored "herbal" blends sometimes include true tea.

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Iced tea and food safety

CDC and health departments have investigated iced-tea urns that sat in the danger zone. Brew hot, cool fast, refrigerate. Do not grow a sun-tea jar at 80 °F for hours.

Leftover pitcher tea with lemon and sugar is a perishable drink once it is cool. Two hours on the picnic table, then it is trash. One hour if the air is above 90 °F.

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Second steeps

Oolong and many whole-leaf greens can take a second infusion. Use the same temperature. Shorten the first steep if you plan a second, or accept a weaker second cup.

The calculator does not add leaf for a resteep. You already paid for that leaf in the first dose.

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How to measure 2 to 3 grams

A kitchen scale that reads to 0.1 g is better than a teaspoon. Fluffy white tea takes more volume than dense gunpowder green for the same mass.

USDA FoodData Central can show brewed tea nutrients per cup. Those values assume a prepared beverage, not the dry leaf dose this tool prints.

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Pots, pitchers, and the 240 mL cup

A 1-liter teapot is about 4.2 of this tool's cups. Green tea in that pot needs 8.4 g leaf at 175 °F. Round to 8 g if your scale is coarse, and do not make up the difference with a longer steep.

Iced tea for a team picnic is often brewed double-strong and poured over ice. Double the leaf, keep the time, then chill fast. Do not double the time in a hot urn.

Hard water films on kettles. It also mutes tea. If your tap is very hard, use filtered water for green and white leaf first. Black tea is more forgiving.

Kids who want "tea" after dinner can drink a short-steep herbal at the 5-minute mark. If the blend includes true tea, treat it as black or green and watch caffeine late at night.

A thermos full of sweet tea for lunch is a sugar problem more than a steep-time problem. Brew unsweetened, chill, and add sugar by the teaspoon if you must, then count those teaspoons.

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Bitterness, timers, and what oversteep really is

Catechins and theaflavins keep dissolving after the sweet amino acids have already come out. That is why a 7-minute green tea at 175 °F tastes harsh and a 2-minute steep of the same leaf tastes rounder.

If you like strong tea, add leaf, not minutes. Three grams of black tea at 4 minutes beats 2.5 g at 8 minutes if you want body without a dry finish.

A kitchen timer is not optional when three kids are talking. The leaf does not care that you forgot. Pull it.

Microwave "tea" heats unevenly. You can scald one side of a bag and leave the other cold. Use a kettle. If you must microwave, stir the water, check that it is near the target temperature, then add leaf.

Lemon in tea is flavor. It is also acid that can make some bottled teas look cloudy. Cloudiness is not the same as spoilage. Spoilage is smell, fizz you did not add, or time in the danger zone.

Hotel ice-tea machines that sit half-full overnight are a known risk pattern in outbreak write-ups. At home, brew what you will drink in a day or two and keep it at 40 °F.

Matcha, masala chai concentrates, and bubble-tea kits are other drinks. Chai with milk is a dairy leftover after it cools. Bubble-tea sugar loads belong on a label tally, not on this steep table.

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Limits

Matcha is whisked powder, not a steep. Pu-erh and dark teas are not in the five types. Packet instructions beat this table when the farm printed a temperature on the pouch.

Medicinal claims about "detox tea" are outside this page. If a child has a tea allergy or a medication interaction question, that is a clinician conversation.

ISO 3103 uses 2 g per 100 mL at a rolling boil for 6 minutes so labs can compare teas. That is a harsher cup than this kitchen table, especially for green leaf. Do not "correct" our 175 °F green row toward ISO unless you are cupping, not drinking.

A second pot from the same bags is weaker. Add a fresh bag rather than boiling the first bags for 12 minutes.

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How it works

Oversteeping extracts bitterness from catechins and theaflavins. Herbal infusions are not Camellia sinensis and often want a longer steep.

Frequently asked questions

• Sweet tea for kids?

  Count added sugar on the lunchbox tally. Unsweetened tea has no added sugar.

Related calculators

References

1. UK Tea & Infusions Association. The perfect brew
2. ISO. ISO 3103: Tea, preparation of liquor for use in sensory tests
3. USDA. FoodData Central
4. UK Tea Academy. UK Tea Academy brewing temperatures (white paper)
5. FDA. Nutrition Facts label
6. AAP HealthyChildren. Caffeine: a primer for parents
7. FDA. Added sugars on the Nutrition Facts label
8. FDA. Spilling the beans: how much caffeine is too much?
9. USDA FSIS. Danger Zone (40 °F to 140 °F)
10. USDA Ask FSIS. 2 Hour Rule
11. CDC. Foodborne germs and illnesses