How Much Caffeine Is in Thai Tea? | What You Need to Know

You order a tall glass of Thai iced tea, that vivid orange drink with the creamy top, and halfway through you wonder if it’s going to keep you up tonight. The color already looks suspiciously intense.

The short answer is yes, Thai tea has caffeine — it’s brewed from black tea leaves. But the exact amount varies widely based on how it’s made, what brand of mix you’re using, and whether you’re sipping a small or large serving. Here’s what the numbers actually look like.

What Gives Thai Tea Its Caffeine

Thai tea starts with strongly steeped black tea leaves. Black tea naturally contains caffeine, and the amount in your cup depends on how long and how hot you brew it.

The primary authoritative source for Thai tea nutrition is Healthline, which estimates a caffeine concentration of 218 mg per liter. That works out to roughly 50 mg in a standard 8-ounce cup — though the actual number can vary.

Restaurant and home versions often differ. A home-brewed 8-ounce cup of plain black tea used as the base has around 45–50 mg of caffeine before you add milk and ice. Once you factor in dilution from ice and the volume of milk, the final per-serving caffeine can land anywhere from 20 to 60 mg.

Why the Range Is So Wide

Different Thai tea brands use different leaf grades and steep times. Some blends include a small amount of green tea or other bases. And if you order a large or extra-large size, the caffeine roughly doubles with the volume.

Why the Exact Number Matters to You

You’re probably not looking up Thai tea caffeine for fun — you want to know if that afternoon drink will mess with your evening sleep, or if it’s a reasonable choice when you’re trying to cut back on coffee.

Here’s how Thai tea stacks up against other popular drinks:

• Compared to coffee: An 8-ounce cup of drip coffee usually has 95–200 mg of caffeine. Thai tea is much lower — about 30–60 mg per serving — so it’s a gentler stimulant.
• Compared to black tea (plain): Standard black tea has about 40–70 mg per 8 oz. Thai tea sits right in that same ballpark, though sometimes on the lower end because of milk dilution.
• Compared to matcha: Matcha typically delivers 60–80 mg per 8-ounce serving. Thai tea is generally less potent than a matcha latte.
• Compared to cola: A 12-ounce cola has about 30–40 mg of caffeine. An 8-ounce Thai tea matches or slightly exceeds that.
• Compared to green tea: Green tea ranges from 20–45 mg per 8 oz. Thai tea often overlaps but can run higher depending on the brew strength.

If you’re sensitive to caffeine, the 30–60 mg range is enough for many people to feel a mild alertness, but not enough to cause jitters the way a triple-shot latte might.

How Much Caffeine in Different Serving Sizes

The most commonly quoted numbers come from restaurant and brand sources. Healthline provides the most authoritative look at the caffeine concentration of Thai tea, noting that the tea itself has 218 mg per liter, which translates to roughly 50 mg per small (8 oz) serving. But actual restaurant servings vary.

Here’s a breakdown by common sizes:

Serving Size	Caffeine Range (mg)	Notes
8 oz (small / standard)	30–60	Most common takeaway size
12 oz (medium)	45–90	Often used in bubble tea shops
16 oz (large)	60–120	Roughly double the small size
20 oz (extra large)	75–150	Approaching a cup of coffee
Home-brewed 8 oz (before milk)	45–50	Based on black tea base

These numbers are estimates. The actual caffeine in your drink depends on the brand of Thai tea mix (like ChaTraMue), the steep time, and whether you order it with boba, which doesn’t add caffeine but adds sugar.

How to Estimate Your Thai Tea Caffeine Intake

If you want to know exactly how much caffeine you’re drinking, you’ll need to look at a few clues.

1. Check the size first. The caffeine per ounce stays roughly the same, so a 16-ounce Thai tea may contain twice the caffeine of an 8-ounce version.
2. Ask about the tea base. Some shops brew a concentrated pot of black tea, then dilute it with milk and ice. Others use instant tea powder. Concentrated brews tend to have more caffeine per ounce.
3. Look at the brand of mix. Popular brands like ChaTraMue, Number One, or Pantai each have slightly different leaf blends and caffeine levels. The bag will usually list caffeine if it’s a concern.
4. Factor in ice. A drink served over ice will have a lower caffeine concentration than the hot brew because the ice melts and dilutes it. The total caffeine in the cup is still the same as the hot tea used, but the per-sip dose is lower.
5. Know that milk doesn’t add caffeine. Adding whole milk, condensed milk, or evaporated milk does not increase the caffeine content. It only changes the volume and sweetness.

If you’re ordering Thai iced tea from a street stall or restaurant, the safest assumption is 45–55 mg per standard cup — similar to a cup of black tea.

How Thai Tea Compares to Other Teas and Coffee Drinks

Per 8-ounce Thai tea caffeine content from a typical recipe falls in the 30–60 mg range. That’s less than a standard cup of coffee (95–200 mg) but still enough to feel a mild lift.

Here’s a quick comparison with common drinks so you can decide whether Thai tea fits your caffeine budget for the day:

Drink (8 oz unless noted)	Caffeine (mg)
Thai tea (small)	30–60
Brewed black tea	40–70
Drip coffee	95–200
Espresso (1 oz shot)	63
Green tea	20–45
Cola (12 oz)	30–40

The takeaway: Thai tea is a milder caffeine source than coffee, but it’s not caffeine-free. If you’re trying to avoid caffeine entirely, look for a decaf black tea base or an herbal version (sometimes called “cha yen” that uses caffeine-free rooibos or a similar substitute).

The Bottom Line

Thai tea typically contains between 30 and 60 mg of caffeine per 8-ounce serving, making it a moderate choice that’s lower than coffee but similar to a standard cup of black tea. The exact amount depends on the brand, brew strength, and whether you’re drinking a small or a large. If you’re sensitive to caffeine, stick with a small size or ask if the shop uses a concentrated brew.

For the most accurate idea of what’s in your Thai tea, check the brand of tea mix your local café uses — many Thai tea bags list caffeine content per liter on the package, and that number is your best guide.