Which Tea Has The Least Caffeine? - Tea Perspective Silver Needle White Tea - 75mg per cup. Matcha - 70mg per cup. Black Tea - 48mg per cup. Green Tea - 40 mg per cup. And coffee, with about 100mg, give or take. One thing to bear in mind is that if you really still want one of the above, you can always reduce the brewing time, and use more water in general.