A typical 16 oz Thai iced tea has roughly 45–80 mg of caffeine — about half a cup of drip coffee. The exact amount depends on glass size, how strong the tea is brewed, and how much of the glass is milk and ice. Set the sliders below for your glass.
How this estimate works
Thai tea is brewed from black tea, which yields about 5–9 mg of caffeine per ounce of brewed tea depending on strength. In a classic cha yen, only ~55% of the glass is actually tea — the rest is ice, condensed milk, and evaporated milk. Served black over ice (cha dam yen), the tea fraction is higher, so the same glass carries more caffeine. Numbers here are estimates, not lab values.
Compared to other drinks
- Drip coffee (8 oz): ~95 mg — Thai tea is roughly half
- Espresso (single shot): ~63 mg — about the same as a 16 oz Thai iced tea
- Green tea (8 oz): ~28 mg — Thai tea has about double
- Cola (12 oz): ~34 mg — Thai tea has more
Want fewer milligrams?
There's no widely sold decaf Thai tea mix, so the levers are: brew lighter, pour a smaller glass, or go heavier on milk and ice. Full nutrition breakdown (calories, sugar) is in our Thai iced tea nutrition guide, and the classic recipe shows exactly how much tea goes into a glass.