Caffeine content of coffee

Depending on the type of coffee and method of preparation, the caffeine content of a single serving can vary greatly. On average, a single cup of coffee (about 200 milliliters) or a single shot of espresso (about 30 mL) can be expected to contain the following amounts of caffeine:

• Drip coffee: 115–175 mg (560–850 mg/L)
• Espresso: 60 mg (2000 mg/L)
• Brewed/Pressed: 80–135 mg (390–650 mg/L)
• Instant: 65–100 mg (310–480 mg/L)
• Decaf, brewed: 3–4 mg
• Decaf, instant: 2–3 mg

Thanks to :  http://en.wikipedia.org/wiki/Coffee

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