How this instrument works
Different teas want different treatment because they're processed differently, even when they all come from the same Camellia sinensis plant (herbal tisanes aside, which aren't technically tea at all). Delicate green and white teas oxidize very little during processing and turn bitter fast in near-boiling water, so they're brewed cooler and shorter. Black tea is fully oxidized and can handle — even needs — near-boiling water and a longer steep to extract its full flavor.
Published brewing guides broadly agree on the ordering (green and white teas coolest and quickest, black and herbal hottest and longest) but genuinely disagree on the exact numbers: one widely cited source puts green tea at 170-185°F for 1-3 minutes, another at 175-185°F for the same range, and oolong ranges swing anywhere from 180°F to 212°F across different guides depending on how oxidized the specific oolong is. This calculator resolves that by using each tea type's commonly published range and taking its midpoint as a single starting number — an explicit convention, not a claim that any other point in the range is wrong.
Treat every result here as a starting point to taste-adjust from, not a fixed rule: steeping a few degrees cooler or a minute shorter is a completely normal way to dial in a tea to your own preference, and loose-leaf tea drinkers in particular often adjust amount and time together to get a stronger or gentler cup.
- Choose your tea type: green, white, oolong, black, or herbal.
- Enter how many cups you're brewing.
- Read Water temperature and Steep time for a starting point for that tea type.
- Read Loose-leaf tea needed for how many teaspoons to use, at the standard 1 tsp per cup ratio.
- Taste partway through steeping if you're unsure, and adjust time or temperature slightly on your next cup to match your preference.
Worked example — one cup of black tea vs. two cups of green
One cup of black tea, the calculator's default: water temperature 206°F and steep time 4 minutes — the midpoints of black tea's commonly published ~200-212°F and 3-5 minute ranges — using 1 teaspoon of loose-leaf tea for the single cup.
Two cups of green tea instead: green tea's gentler published range (~170-185°F, 1-3 minutes) gives midpoints of 178°F and 2 minutes, noticeably cooler and shorter than black tea to protect its more delicate flavor compounds from turning bitter. Two cups need 2 teaspoons of loose-leaf tea, scaling linearly with cups.
One cup of herbal tea sits at the same 206°F as black tea but steeps much longer, 7 minutes (the midpoint of a commonly published 5-10 minute range) — herbal tisanes generally tolerate near-boiling water and longer steeps well since they lack the tannins that make true teas turn bitter or astringent when over-steeped.
Questions
Why do different sources give different numbers for the same tea?
Because brewing guidance is a convention, not a physical law — it varies by the specific tea's oxidation level, leaf size, and the source's own house style, and published ranges genuinely overlap and disagree across reputable tea sellers and guides. This calculator resolves that by taking the midpoint of a commonly published range for each tea type, which is a reasonable starting point but not the only correct answer.
Why does green tea need cooler water than black tea?
Green and white teas are minimally oxidized during processing, which leaves more delicate compounds intact — brewing them in near-boiling water pulls out excess tannins and bitterness before the pleasant flavors have a chance to dominate. Black tea is fully oxidized, which changes its chemistry enough that it needs hotter water and a longer steep to extract its full flavor without tasting weak or flat.
Is herbal tea the same as "real" tea?
No — herbal tea, or tisane, isn't made from the Camellia sinensis plant that green, white, oolong, and black tea all come from; it's an infusion of other plants, flowers, or fruit. That's part of why it tolerates near-boiling water and a much longer steep without turning bitter: it lacks the tannins that make true teas astringent when over-steeped, so "you can't really over-steep a tisane" is a common (if slightly overstated) rule of thumb.
Can I use this for tea bags instead of loose-leaf?
The temperature and steep time guidance applies equally well to tea bags, since it's driven by the tea type, not the format. The teaspoon amount is specific to loose-leaf tea, though — a standard tea bag is typically designed to brew one cup on its own, so you generally don't need to weigh out a separate loose-leaf equivalent when using bags.
What if my tea tastes bitter even at these settings?
Bitterness is usually a sign of over-extraction — water too hot, steeped too long, or too much leaf for the water volume. Try trimming a minute off the steep time or using slightly cooler water first, since both push extraction in the same direction; adjusting the leaf-to-water ratio is the other lever if temperature and time changes alone don't fix it.