Tea Brewing Calculator

How to Use This Tea Brewing Calculator

Pick your tea type and how many cups you are brewing. The calculator returns the target water temperature in Fahrenheit and Celsius, the steep time, and the total loose-leaf amount. These parameters come from the consensus across tea industry references: green and white at 175F, oolong at 195F, black and herbal at a full 212F boil.

Temperature and Time Reference

Temperature controls which compounds extract: cooler water pulls sweet amino acids and fewer bitter tannins, which is why delicate teas demand cooler water. Time controls extraction depth. The kettle-rest trick works because water loses roughly 10F every couple of minutes in an open kettle; two to three minutes off boil lands near 195F, four to five near 175F.

Worked Example

Brewing 2 cups of green tea: heat to 175F (or boil and rest 4 to 5 minutes), use 2 teaspoons of leaf, steep 2 to 3 minutes covered, then remove the leaves. For 4 cups of black tea: full boil, 4 teaspoons leaf, steep 3 to 4 minutes. Same process, different numbers; the calculator keeps them straight.

Practical Tips for Better Tea

Warm the teapot with a rinse of hot water first so the brew temperature does not crash. Use a timer; "about 3 minutes" always becomes 7. Cover the cup while steeping to trap aromatics. Store tea airtight away from light, heat, and strong smells; tea absorbs odors eagerly. Buy small quantities often rather than bulk rarely; stale tea cannot be rescued by technique.

Western vs Gongfu Brewing

This calculator uses Western parameters: more water, longer steeps, one or two infusions. Gongfu style flips it: lots of leaf (5 g per 100 ml), tiny steeps of 10 to 30 seconds, many infusions. Gongfu suits oolong and pu-erh beautifully and is worth trying once you have the basics down. The temperatures stay the same; only the leaf-to-water ratio and timing change.

Second worked example: a delicate green tea

Take 3 grams of Dragon Well or sencha, about 1 heaped teaspoon, for 250 ml of water. Heat the water to 175°F, not boiling. Warm the cup with a splash, discard it, add the leaves, and pour. Steep 2 minutes, then pour out every drop; leaves sitting in water keep extracting and turn bitter. The second steep gets 30 extra seconds, the third another 30. Three steeps from 3 grams is the honest yield of good green tea. If the first cup tastes grassy-bitter, the water was too hot. If it tastes like warm water, add another gram of leaf next time.

Temperature is the whole game for green tea

Boiling water extracts catechins, the bitter compounds, far faster than it extracts the sweet amino acids like theanine. At 175°F the balance favors sweetness; at 212°F it favors bitterness. This is not subtle: the same green tea brewed at both temperatures tastes like two different teas. White tea wants 175 to 185°F, green 160 to 180°F, oolong 195°F, black and herbal a full 212°F. No thermometer? Boil the kettle, then wait: 5 minutes in an open vessel drops roughly 25°F, landing near 185°F; 8 to 10 minutes lands near 170°F. Pouring between two cups cools about 10°F per transfer.

Leaf quantity: the ratio nobody measures

Western brewing uses 2 to 3 grams per 8 ounces of water, steeped 2 to 4 minutes. It is forgiving and familiar. Gongfu brewing flips it: 5 to 7 grams per 100 ml, steeped 20 to 45 seconds, repeated 6 to 8 times. The heavy leaf and short steeps extract flavor in layers instead of all at once, which is why oolong and pu-erh shine this way. Most people under-leaf: a timid teaspoon in a big mug makes weak tea, and they blame the tea. When in doubt, add leaf before adding time; more leaf with a short steep beats little leaf with a long one.

Brewing mistakes

Boiling green tea is number one, covered above. Squeezing the tea bag is second; it wrings out tannins and adds bitterness for almost no extra strength. Reboiling the kettle concentrates minerals and flattens the water; fresh cold water boiled once tastes cleaner. Storing tea above the stove is third: heat, steam, and light kill aroma in weeks, while a sealed tin in a dark cabinet keeps it for months. And using the same steep time for every tea: a delicate white at 4 minutes is ruined, a strong Assam at 2 minutes is weak. Match the time to the leaf.

Second Worked Example: The Oolong Middle Path

Oolong sits between green and black, and its brewing splits the difference. Western style: 195°F water, 2 teaspoons of leaf per 8 ounces, steep 3 minutes. The same tea gongfu style: 200°F water, 5 grams of leaf in a small 100 ml pot, steep 30 seconds, then re-steep 6 to 8 times, adding 10 seconds each round. The gongfu version extracts the tea's evolution: floral in the first steeps, honeyed in the middle, mineral at the end. Enter oolong above and the calculator gives both methods, because the "right" way depends on how much afternoon you have.

Water Matters More Than the Tea

Great tea in bad water tastes bad, and the fix is unglamorous: use filtered water. Heavy chlorine or hard mineral water mutes delicate greens and adds off flavors that no temperature adjustment fixes. Do not reboil water: boiling drives off dissolved oxygen, and flat water makes flat tea, which is why the second pot from the same kettle always tastes duller. Heat fresh cold water each time, and stop the kettle the moment it reaches temperature rather than letting it rolling-boil. These three habits, filtered, fresh, and just-boiled, improve every tea you own without buying a single new one.

Storing Tea: The Four Enemies

Tea degrades through four enemies: light, heat, moisture, and air. An opened bag of green tea goes stale in weeks at room temperature in a clear jar by the stove; the same tea in an opaque, airtight tin in a cool cupboard lasts months. Buy smaller quantities of green and white teas, which fade fastest, and larger quantities of black and oolong, which hold longer. The fridge is a trap: condensation on cold leaves adds the moisture you were avoiding. If you must refrigerate, seal airtight and let the package reach room temperature before opening.