A 16 fl oz Thai iced coffee carries roughly 100–200 mg of caffeine; a 16 fl oz cafe-style Thai iced tea carries about 60–130 mg — so the coffee is usually the stronger of the two, often by about double. They are not two versions of one drink: Thai iced tea (cha yen) is strong black tea brewed bright orange and finished with sweetened condensed milk, while Thai iced coffee (oliang) is dark-roasted robusta coffee — traditionally ground with roasted corn, soybean and sesame — brewed black through a cloth sock filter and served sweet over ice.
Same carts, same tall glass of ice, same sweetness. The base, color, flavor and caffeine are where they part company.
Thai Iced Tea vs Thai Iced Coffee: Side by Side
| Thai iced tea (cha yen) | Thai iced coffee (oliang / kafae yen) | |
|---|---|---|
| Base | Black tea leaf (Camellia sinensis), Assam- or Ceylon-style; commercial mixes often add vanilla, star anise or cardamom flavoring | Dark-roasted robusta, traditionally ground with roasted corn, soybean and sesame |
| How it is brewed | Steeped double-strength through a cotton sock filter, then chilled | Steeped 5–10 minutes through the same sock filter (a tung tom) |
| Milk | Sweetened condensed milk, usually topped with evaporated milk | None in oliang (served black); condensed and evaporated milk in kafae yen |
| Sweetener | Sugar, plus the condensed milk | Sugar or brown sugar, often already in the mix |
| Color | Bright orange — from added food coloring in commercial mixes (typically Sunset Yellow FCF / FD&C Yellow No. 6), not the leaf or spices | Near-black, turning tan once milk is stirred in |
| Taste | Sweet and creamy; vanilla and malt, sometimes a faint warm-spice note | Sweet and bitter at once; smoky roasted-grain and dark-chocolate notes |
| Caffeine per 16 fl oz | 60–130 mg | roughly 100–200 mg |
| When Thais drink it | All day from carts and food stalls; a standard partner to spicy food | All day from the same carts, often with breakfast or lunch |
What Is Thai Iced Coffee?
Traditional Thai iced coffee is oliang, from Teochew Chinese for "black and cold." The powder is not plain coffee: a traditional oliang mix is roughly half dark-roasted robusta by weight, the rest roasted corn, soybean and sesame, sometimes with rice, brown sugar and cardamom — the grains give the drink its smoky, almost chocolatey edge. It is brewed by loading the powder into a tung tom, a sock-shaped cotton bag on a metal ring, pouring near-boiling water through and steeping several minutes, then serving it black and sweet over ice. Add condensed and evaporated milk and it becomes kafae yen — what most menus outside Thailand mean.
What Is Thai Iced Tea?
Thai iced tea, or cha yen, starts with black tea. The leaf is brewed double-strength, often through that same sock filter, then poured over ice and finished with sweetened condensed milk and a float of evaporated milk. A 16 fl oz cafe serving runs about 250–400 kcal, nearly all of it from the milk and sugar. Our Thai iced tea recipe covers the ratios.
Is Thai Coffee Strong?
Yes, on both counts people mean by "strong." Thai coffee is built on robusta, which carries more caffeine per gram than the arabica behind most Western coffee — published analyses put robusta at roughly 1.2–2.9% of bean weight against 0.8–1.8% for arabica. It is dosed heavily too, at three to four tablespoons of powder per 8 fl oz of water. In flavor it is just as assertive: dark-roasted, bitter, with a toasted depth from the grains.
How Much Caffeine Is in Thai Iced Coffee?
A typical 16 fl oz Thai iced coffee lands around 100–200 mg. Published estimates disagree — some put an 8 fl oz serving at 60–80 mg (about 120–160 mg in a 16 oz glass), others put a large serving nearer 150–200 mg — because no two shops build it the same way. Four things move the number:
- Robusta, not arabica. Gram for gram the bean carries one and a half to two times the caffeine.
- Heavy dose, long steep. Three to four tablespoons of powder steeped 5–10 minutes extracts far more than a drip cycle.
- The grains cut it back. If half the mix by weight is roasted corn, soybean and sesame, half the powder in the sock contributes no caffeine.
- Ice and milk. A 16 oz cup is mostly ice, and the milk takes more of it — together they decide how much brewed coffee fits.
Those pull in opposite directions, which is why the honest answer is a range: a coffee-heavy mix and a generous pour can push past 200 mg, while a grain-heavy mix, or a US restaurant sweetening drip coffee, lands nearer 80 mg.
Is Thai Tea Coffee? Does Thai Tea Have Coffee in It?
No. Thai tea contains no coffee whatsoever. It is brewed from Camellia sinensis tea leaf — the same plant behind English breakfast or Assam — so its caffeine comes from leaf, not bean. The confusion is fair: the two are sold side by side, from the same tin of condensed milk, in the same tall cup. For per-cup numbers across every way Thai tea is served, see our Thai tea caffeine guide.
Thai Iced Tea vs Thai Iced Coffee: Which Should You Order?
- Thai iced tea for the sweeter, creamier glass — and roughly half the caffeine.
- Thai iced coffee for a bitter edge under the sweetness, smoky roasted-grain flavor, and the higher-caffeine option.
- Oliang rather than kafae yen if you want it black: the same coffee without the milk, far less sweet.
What If You Want a Glass With No Caffeine at All?
Neither drink is caffeine-free, and no version of either is. The Thai alternative is a botanical infusion — butterfly pea flower, lemongrass, bael fruit, ginger, roselle, chrysanthemum — which contains no tea leaf and no coffee bean, and therefore 0 mg of caffeine. Our caffeine-free Thai botanical infusion is the blend we build around that tradition.
To say it plainly: we are a tea company. We sell Thai loose-leaf tea and botanical blends, not coffee — the Assam Thai black tea is the leaf behind the orange glass.
Frequently Asked Questions
Is Thai iced coffee stronger than Thai iced tea?
In caffeine, usually yes. A 16 fl oz Thai iced coffee runs roughly 100–200 mg, a 16 fl oz cafe-style Thai iced tea about 60–130 mg — often around double. In flavor the gap is just as clear: the coffee is bitter and smoky, the tea sweeter and creamier.
How much caffeine is in a 16 oz Thai iced coffee?
Roughly 100–200 mg, depending on the shop. Thai coffee is built on robusta, which carries more caffeine per gram than arabica, and it is brewed at a heavy powder-to-water ratio. Pulling the other way, traditional oliang mixes are about half roasted corn, soybean and sesame, which contribute none.
Does Thai iced tea have coffee in it?
No. Thai iced tea is brewed from black tea leaf, sweetened with condensed milk and served over ice, with no coffee at any stage. Its caffeine — about 60–130 mg in a 16 fl oz cafe serving — comes entirely from the leaf. Thai iced coffee is a separate drink sold alongside it.
What is oliang, and how is it different from kafae yen?
Oliang is Thai black iced coffee: dark-roasted robusta ground with roasted corn, soybean and sesame, brewed through a cotton sock filter and served sweet over ice with no milk. Kafae yen is the same coffee finished with condensed and evaporated milk. Outside Thailand, menus usually mean kafae yen.
Is there a Thai iced drink with no caffeine?
Yes. Thai botanical infusions — butterfly pea flower, lemongrass, bael fruit, ginger, roselle, chrysanthemum — contain no tea leaf and no coffee bean, so they measure 0 mg of caffeine however strongly you brew them. They are served iced and sweetened much like cha yen.
Caffeine and calorie figures here are typical ranges; individual shops and products vary.
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