Short answer: a cafe-style 16 fl oz Thai iced tea has about 250–400 calories, almost all of it from sweetened condensed milk and sugar. The brewed tea itself has 2–5 calories. A home version with less condensed milk lands at 100–200, and an unsweetened Thai tea over ice is close to zero. Thai iced tea and Thai milk tea are the same drink (cha yen), so the calorie question is the same for both. The per-size table is below.
If you have ever ordered a tall glass of Thai tea at a restaurant or bubble tea shop and wondered how many calories were in it, you are not alone. This vibrant, orange-hued drink has become a favorite well beyond Thailand's borders, and understanding what goes into it helps you enjoy it on your own terms. Below we break down the ingredients, the calorie math by cup size, and how a loose-leaf approach at home gives you full control over what ends up in your glass.
What Is Thai Milk Tea?
Thai milk tea, known in Thailand as cha yen and sold abroad as Thai iced tea, is a sweetened, iced drink built on a base of strong-brewed black tea, typically an Assam or Ceylon-style leaf that gives the drink its deep amber color. The tea base is sweetened with sugar and sometimes flavored with star anise, tamarind or vanilla. It is poured over ice and finished with evaporated milk, condensed milk, or sometimes whole milk and cream, which creates the creamy, pale swirl the drink is famous for.
Because it is a black-tea drink, Thai milk tea also contains caffeine: roughly 30–70 mg for a home-brewed 8 fl oz cup and 60–130 mg for a 16 fl oz cafe serving. The full breakdown is in our guide to how much caffeine is in Thai tea.
Thai Tea Calories by Cup Size and Recipe
Calorie counts vary with the recipe, the shop and the serving size. The table gives realistic ranges for the ways Thai tea is most often served. Use the 16 fl oz column as the "standard restaurant glass" and scale from there.
| How it is served | Size | Approximate calories | Where the calories come from |
|---|---|---|---|
| Unsweetened Thai black tea, hot or iced, no milk | 8–16 fl oz | 2–5 kcal | Trace, from the tea itself |
| Thai iced tea, restaurant style (condensed + evaporated milk, full sugar) | 12 fl oz | 190–300 kcal | Condensed milk, sugar |
| Thai iced tea, restaurant style | 16 fl oz | 250–400 kcal | Condensed milk, sugar |
| Thai milk tea, bubble-tea shop, full sugar, no toppings | 20 fl oz | 300–450 kcal | Condensed milk, sugar syrup, creamer |
| Thai milk tea with boba (tapioca pearls) | 20 fl oz | 400–600 kcal | Pearls add 100–150 kcal on their own |
| Same drink at "50% sugar" | 20 fl oz | 220–330 kcal | Less syrup; condensed milk still counts |
| Home version, whole milk, half sugar | 16 fl oz | 130–200 kcal | Milk, sugar |
| Home version, oat or almond milk, low sugar | 16 fl oz | 80–140 kcal | Plant milk, light sweetener |
| Thai green milk tea (cha khiao yen) | 16 fl oz | 220–380 kcal | Same milk and sugar; the tea base differs, not the calories |
| Thai botanical infusion, iced, unsweetened (butterfly pea, lemongrass, bael) | 16 fl oz | 0–5 kcal | No tea leaf, no milk, no sugar |
The single biggest driver is sweetened condensed milk. One tablespoon adds roughly 60 calories, and cafe recipes often use two to four tablespoons per glass. Sugar syrup and evaporated milk add more on top. The tea is nearly calorie-free; the additions shape the drink.
How Many Calories in Thai Tea? The Quick Math
To estimate any Thai tea yourself, add up the parts:
- Brewed black tea: about 2 kcal per 8 fl oz
- Sweetened condensed milk: about 60 kcal per tablespoon (15 ml)
- Evaporated milk: about 20 kcal per tablespoon
- Whole milk: about 9 kcal per tablespoon; oat milk about 7; unsweetened almond milk about 2
- Sugar or simple syrup: about 16 kcal per teaspoon of sugar (48 per tablespoon)
- Tapioca pearls: about 100–150 kcal per standard scoop
- Ice: 0
Example: a 16 fl oz restaurant glass with 3 tbsp condensed milk (180), 2 tbsp evaporated milk (40), 1 tbsp sugar syrup (48) and tea (4) comes to roughly 270 kcal, squarely inside the 250–400 range above.
Breaking Down Each Ingredient
The Tea Base
Brewed black tea, even a very strong concentrate, contributes almost no calories. The flavor, color and caffeine come from the leaves, and the leaves themselves are not consumed.
Condensed Milk
Sweetened condensed milk is thick, very sweet and calorie-dense because of the sugar added during processing and the fat naturally present in whole milk. It is responsible for much of the richness and the unmistakable sweetness of the classic version.
Evaporated Milk
Evaporated milk has had roughly 60% of its water removed, making it creamier and richer than regular milk. It is unsweetened, so lower in sugar than condensed milk, but it still adds fat and calories.
Added Sugar
Many recipes call for sugar syrup in addition to condensed milk. Each teaspoon of sugar adds around 16 calories, so several tablespoons of syrup raise the total meaningfully.
Ice
Ice adds no calories, though it dilutes the drink slightly as it melts, which mellows the sweetness over time.
How to Make a Lighter Thai Milk Tea at Home
Making Thai milk tea at home gives you direct control over every ingredient. The levers, in order of impact:
- Use less condensed milk. Start with one teaspoon rather than several tablespoons and taste as you go.
- Swap in unsweetened evaporated milk or whole milk to keep the creamy texture while cutting added sugar.
- Try oat or almond milk for a lighter finish; oat milk brings a natural sweetness that lets you reduce sugar further.
- Brew a stronger tea base so the flavor comes through without needing as much sweetener to compensate.
- Use a small amount of honey or coconut sugar if you prefer alternatives to refined white sugar.
Our step-by-step Thai iced tea recipe shows the classic method and the lighter variations side by side, and the temperature and steeping guide covers how to get a bold base without bitterness.
Thai Botanical Alternatives: Naturally Caffeine-Free, Nearly Calorie-Free
Not every Thai tea experience needs to start with black tea. Thailand has a rich tradition of botanical infusions, such as butterfly pea flower, lemongrass, bael fruit and plai (Thai ginger), that are naturally caffeine-free and virtually calorie-free on their own. They make an appealing base for a lighter, milk-optional iced drink.
Butterfly pea flower, for example, brews into a striking deep blue that shifts to purple when citrus is added. Poured over ice with a splash of coconut milk and a light touch of sweetener, it makes a visually stunning drink with far fewer calories than the classic cha yen. Explore the options in our guide to authentic Thai infusions.
Cafe vs. Home: A Side-by-Side Comparison
One reason home brewing appeals to calorie-conscious tea drinkers is transparency. When you order at a cafe or bubble tea shop, the exact recipe is rarely disclosed. Portion sizes vary, milk types differ, and sugar levels at chain shops are often higher than home cooks would use by default.
At home you measure every addition. You can make a full-flavored iced Thai tea that costs a fraction of a cafe order and lands anywhere on the calorie spectrum you choose, from a lightly sweetened glass under 100 calories to a rich, indulgent treat. Starting with quality leaf makes the biggest difference: our Assam Thai tea leaves are the traditional black-tea base for the classic orange cup, and a flavorful base needs less sweetener to taste satisfying.
Related reading
- Does Thai Tea Have Caffeine? Per-cup numbers vs coffee
- How to Make Thai Iced Tea at Home (Cha Yen Recipe)
- What Is Thai Tea Good For? Flavor, occasions and uses
Frequently Asked Questions
How many calories are in Thai tea?
Unsweetened, 2–5 calories per cup. As Thai iced tea or Thai milk tea, about 250–400 calories for a 16 fl oz restaurant glass, because of the condensed milk and sugar. A 12 fl oz glass is roughly 190–300 and a 20 fl oz bubble-tea size 300–450 before toppings.
How many calories are in a large Thai milk tea from a bubble tea shop?
A large (16–20 oz) Thai milk tea from a typical bubble tea shop often falls in the range of 300–450 calories, depending on the sugar level chosen and whether tapioca pearls or other toppings are added. Pearls alone add 100–150 calories. Choosing "50% sugar" or "less sweet" at the counter is the simplest way to reduce the total.
How many calories are in Thai iced tea with boba?
Roughly 400–600 calories for a 20 fl oz cup at full sugar. The pearls contribute 100–150 of that; the rest is the condensed milk and syrup in the tea itself.
Is Thai milk tea high in caffeine?
It contains caffeine because it is made from black tea: about 30–70 mg for a home-brewed 8 fl oz cup and 60–130 mg for a 16 fl oz cafe serving, depending on brew strength. If you prefer none, Thai botanical infusions such as butterfly pea flower or lemongrass are naturally caffeine-free and can be served the same way.
Can I make Thai milk tea with fewer calories without losing the flavor?
Yes. The most effective changes are reducing or replacing condensed milk (the main calorie source), using unsweetened plant-based milk, and brewing the tea base extra-strong so the flavor stands on its own with less sweetener. High-quality loose-leaf tea makes a significant difference: a flavorful base needs less added sweetness to taste satisfying.
If you'd like to brew your own iced Thai tea at home, ArtisanThai offers single-origin Thai leaves and caffeine-free botanical blends sourced directly from growers in Thailand and shipped internationally.
If you'd like to try a traditional Thai herbal blend rather than a milk tea, our 15-botanical caffeine-free blend combines butterfly pea flower, lemongrass and other traditional Thai botanicals into a single ready-to-brew infusion.
Calorie figures are estimates built from standard ingredient values (USDA-type reference data for milk, condensed milk and sugar) and typical recipes; individual products and shops vary. This article covers ingredients and culinary information. It is not medical or dietary advice.
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