Coffee vs Tea: What Actually Separates Them

This comparison usually gets asked for one of two reasons. Either somebody is deciding what to drink themselves, or — and this is the version we are set up to help with — they are buying a present for a household where one person drinks coffee, the other drinks tea, and the gift has to work for both.

The good news for the second group is that these two habits share more equipment than they look like they do. The bad news for anybody comparing them on caffeine is that they are not close, and the gap is larger than the folklore suggests.

The caffeine question, with real numbers

The FDA publishes a table of typical caffeine content per 12 fluid ounces, which is the only way to compare these fairly — comparing “a cup” of each is meaningless when a mug of coffee and a teacup are different sizes. Per 12 fl oz:

• Regular brewed non-specialty coffee: 113–247 mg. That wide range is real, and it is mostly about how much coffee went in relative to water.
• Black tea: 71 mg.
• Green tea: 37 mg.

So the weakest brewed coffee on the FDA’s range still carries more caffeine than the strongest tea on it, and a strong coffee is roughly three times a black tea and nearly seven times a green tea. If somebody says they have switched to tea to cut down, the numbers back them up. If somebody says tea “has more caffeine than coffee” because of something they read about dry leaves, they are comparing the dry weight of leaf to a brewed drink, which is not a comparison anybody drinks.

For context on the total: the FDA cites 400 mg a day — which it describes as about two to three 12 fl oz cups of coffee — as an amount not generally associated with negative effects for most healthy adults. Reaching that on green tea would take about eleven cups. Our how much caffeine is in coffee guide breaks the coffee side down by brewing method.

Side by side

What is actually different in the cup

Coffee is made from roasted seeds that have to be ground; tea is made from dried leaves that do not. That single difference cascades into everything else. Grinding gives coffee an enormous amount of surface area, which is why it extracts in seconds to minutes rather than steeping quietly, and why grind size is the variable that dominates every coffee conversation — see our grind size guide for how much it changes.

It is also why coffee has an equipment culture and tea largely does not. A tea drinker needs hot water and something to hold the leaves. A coffee drinker gradually acquires a grinder, a brewer, a kettle they can set to a temperature, and a scale — not because tea drinkers are less serious, but because coffee has more variables that can go wrong.

Bitterness works differently too, and this is the practical bit. Tea goes bitter from steeping too long or using water that is too hot for the leaf — green tea in particular is easy to scald. Coffee goes bitter from over-extraction, which is usually a grind problem rather than a time problem. Both are fixable, and in both cases the person blames the product rather than the method.

The temperature overlap that matters for gifts

Here is the most useful thing on this page if you are shopping. The single piece of equipment that improves both habits is a kettle you can set to a specific temperature.

Coffee is brewed just off the boil. Black tea wants water at a full boil. Green tea wants distinctly cooler water, and boiling water is the most common reason home-brewed green tea tastes harsh. A standard kettle does exactly one of these three things. A variable-temperature kettle does all three, and it is the reason we recommend one so often on this site — the pouring precision is for the coffee drinker, the temperature dial is for everyone. Our best gooseneck kettles covers the range, from a showpiece to a genuine budget pick.

Two other things cross over. Good mugs and double-walled glasses serve either drink, and a mug warmer keeps either from going cold at 10am — see best coffee mugs and best mug warmers. What does not cross over is anything downstream of grinding: a grinder, a portafilter, an espresso machine. Those are coffee-only purchases.

Buying for the coffee drinker in a tea household

This is the common case, and the mistake is buying something that takes over the kitchen. A coffee machine in a mostly-tea household is a large object used by one person, and it can land badly.

Better: something small, personal and put away between uses. An AeroPress or a single-cup pour-over makes one excellent cup for one person and lives in a cupboard; our pour-over roundup and AeroPress review cover both. Add a hand grinder rather than an electric one for the same reason: it is quiet, it is small, and it does not need a permanent spot on the counter. Best manual coffee grinders has the options.

Buying for someone who drinks both

Plenty of people drink coffee in the morning and tea in the afternoon, and they are the easiest of all to buy for once you know it. The temperature-controlled kettle is the obvious answer. After that, think about the shared furniture of the drink rather than the drink itself — a good mug, a set of glasses, a warmer, a canister that keeps things airtight.

Beans are still a fine gift for this person, with one adjustment: buy a smaller bag than you would for a dedicated coffee drinker, because somebody splitting their day between two drinks gets through coffee more slowly and stale beans are the usual result. Our sampler sets suit them particularly well for exactly that reason: small bags, more variety, less waste.