Caffeine is one of the main reasons many enjoy tea — it provides a gentle energy boost without the jitters often associated with coffee. But did you know caffeine levels vary widely among different types of tea leaves?
Here’s a general ranking of common tea varieties by their typical caffeine content (per 8 oz brewed cup):
Black Tea: Highest caffeine among teas, averaging 40-70 mg
Oolong Tea: Medium-high, around 30-50 mg
Green Tea: Moderate, roughly 20-45 mg
White Tea: Lower caffeine, approximately 15-30 mg
Pu-erh Tea: Varies widely, typically 30-70 mg depending on fermentation and age
Herbal Tea: Naturally caffeine-free (e.g., chamomile, rooibos)
These numbers can fluctuate based on tea leaf grade, growing conditions, and brewing time and temperature.
How is caffeine measured in tea?
Accurate caffeine quantification requires precise scientific methods. The most common techniques include:
High Performance Liquid Chromatography (HPLC): The gold standard for caffeine analysis, HPLC separates and quantifies caffeine molecules from tea extracts with high accuracy. It is widely used in laboratories worldwide.
UV-Vis Spectrophotometry: Measures absorbance of caffeine at specific wavelengths but is less precise than HPLC and more prone to interference.
Mass Spectrometry (MS): Often combined with HPLC for enhanced identification and quantification of caffeine and other compounds.
At TeaTeapot, we ensure the teas we offer meet quality standards, including verified caffeine content when requested. Check out our premium tea selection to explore teas tailored for your caffeine preference.
Understanding caffeine levels can help you select the perfect tea for morning energy, afternoon calm, or evening relaxation. Next time you brew, consider the caffeine ranking and savor your cup with confidence.
