The amount of caffeine in a cup of tea varies tremendously, depending on the variety of tea and the brewing time. In lab tests, we found that Kia Chai blends (Ginger, Cardamom, and Masala which are usually 2.3g servings) contain 67 to 78 milligrams of caffeine. Kia Loose Leaf teas (2.8 gram serving) contain 118 milligrams of caffeine. A strong cup of black coffee has about 120 milligrams of caffeine.