Tea Caffeine Calculator
The easiest to use caffeine calculator available. Look up caffeine in green tea, oolong tea, black tea, and now Starbucks Teas.
The Tea Caffeine Calculator: loose leaf teas as well as caffeine in Starbucks tea. Use this for quick lookup of how much caffeine you are drinking right now.
The Advanced Tea Caffeine Calculator: for loose leaf tea lovers, allows you to select tea, size, and number of steeps. Use this if you multi-steep loose leaf tea.
Ounce to Milliliter Serving Conversion
Caffeine varies with water temperature, tea type, steep time, roast, growing conditions, and extraction method.
Teas brewed at ratio of 1:50 (grams/ml) boiling water to tea leaves, steeped for 6 minutes. Cold brew, 4 hours.