Green Tea vs Black Tea: The Difference Between Them

Every true tea, green, black, oolong, and white, is made from Camellia sinensis. As soon as a leaf is picked and its cells are broken, enzymes start reacting with oxygen and the leaf browns, the way a cut apple does. Tea makers decide how far to let that go.

Green tea's early heating is called "kill-green" or fixing. Japanese greens like sencha are usually steamed, which gives a brighter, more vegetal, sometimes marine taste. Chinese greens like Dragon Well are usually pan-fired, which gives a toastier, nuttier taste.

Black tea's rolling deliberately bruises the leaf so oxidation can run to completion. Many everyday tea bags use CTC (crush, tear, curl) black tea, which oxidizes quickly and brews dark and strong; whole-leaf "orthodox" black teas brew smoother and more nuanced.

Black tea usually has more caffeine than green tea. USDA FoodData Central lists a brewed 8 oz cup of black tea at about 47 mg and green tea at about 28 mg. Mayo Clinic's chart is nearly the same, 48 and 29 mg. For scale, drip coffee is about 95 mg.

The ranges overlap more than those averages suggest. A lab study of 20 commercial teas (Chin et al., Journal of Analytical Toxicology, 2008) found white, green, and black teas all between 14 and 61 mg per serving, with no consistent trend by tea type. Much of the typical gap comes from brewing: black tea is usually made with boiling water and steeped longer, both of which extract more caffeine.

• Green tea can match black if you brew it hot and long, or if it is a shade-grown, bud-rich tea like gyokuro. Matcha, a powdered green tea, can approach coffee because you drink the whole leaf.
• Black tea can come in lower with a short steep or a second infusion.

Every row with sources is in our tea caffeine chart. For the green row in detail, see does green tea have caffeine.

Green tea brews pale green to gold. It tastes fresh and vegetal: steamed greens, cut grass, sometimes nutty (pan-fired Chinese greens) or marine and brothy (steamed Japanese greens). Brewed correctly, it should be smooth, not bitter.

Black tea brews amber to deep red-brown. It is fuller and brisker, with flavors that follow its origin: malty Assam, bright Ceylon, muscatel Darjeeling, smoky Lapsang Souchong. Its body and tannins are why it holds up to milk and sugar.

If you like coffee, black tea is usually the easier switch. If you prefer something lighter to sip plain, start with green.

Both teas are rich in polyphenols, but different ones, because oxidation changes them.

• Green tea keeps most of the leaf's original catechins, including EGCG, because heating stops oxidation before it can convert them.
• Black tea has fewer catechins, because oxidation turns many of them into theaflavins and thearubigins. Those compounds are what make black tea dark and brisk.
• Both contain L-theanine and caffeine.

Both teas have been studied for heart and metabolic markers, mostly in observational research, which shows associations and cannot show cause. Neither tea treats or prevents a disease. The practical takeaway is simpler: drink the one you enjoy, without much added sugar. This is not medical advice.

Most bad green tea is scalded green tea. Water that is too hot pulls out bitter compounds fast.

No thermometer? Let a boiled kettle sit a few minutes before pouring on green tea. For black tea, pour right off the boil. Use one bag or about a teaspoon of loose leaf per 8 oz cup for either. Full temperatures for every tea are in our brewing temperature chart.

Milk: black tea's body and tannins stand up to milk; green tea's delicate flavor usually turns flat and muddy. The green tea milk drink that works is the matcha latte, made with powdered matcha.

Iced: black tea is the classic American iced tea, because it keeps its flavor over ice. Green tea is excellent cold-brewed, steeped in cold water in the fridge for several hours, which keeps it sweet and avoids bitterness.

Plain and hot: this is where good green tea shows best.

Oxidation is a spectrum, and every true tea sits somewhere on it. White tea is the least processed: young leaves and buds, withered and dried with light oxidation. Green tea is heated to stop oxidation early. Oolong is partly oxidized, so light oolongs taste closer to green and dark oolongs closer to black. Black tea is fully oxidized.

If green feels too grassy and black too heavy, oolong is the bridge. The closest pairs are compared in oolong vs green tea and white tea vs green tea, and the full map is in types of tea.

Choose green tea if you want less caffeine per typical cup, a lighter taste, a tea to drink plain, or an afternoon cup that is less likely to affect sleep.

Choose black tea if you want a stronger cup closer to coffee, a tea that takes milk, a breakfast blend, or a pitcher of iced tea.

Many people keep both: black in the morning, green after lunch, and a caffeine-free herbal such as peppermint or spearmint in the evening (see peppermint vs spearmint tea). Tested picks are in the best green teas and the best black teas, and current cost per cup is tracked in our tea bag price index.

The quickest way to decide is to taste each one brewed properly.

• Days 1 to 4, black tea: an English Breakfast style bag, freshly boiled water, 3 to 4 minutes. Once plain, once with milk.
• Days 5 to 8, green tea: water around 170 to 175°F, 1 to 2 minutes. If you have only had scalded green tea, this is a different drink.
• Days 9 to 11: put each one at your hardest time of day and notice which suits you.
• Days 12 to 14: brew your favorite with extra care. The one you look forward to is your answer.