The caffeine content in a "standard" 148-mL (five-ounce) cup of coffee is estimated to be about 100 mg.

Name: The caffeine content in a "standard" 148-mL (five-ounce) cup of coffee is estimated to be about 100 mg.
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A standard 148-mL (5-ounce) cup of coffee is commonly estimated to contain around 100 mg of caffeine, though this amount can vary based on the type of coffee bean, the brewing method, and the strength of the brew.

The Caffeine Content in a "Standard" 148-ML (Five-Ounce) Cup of Coffee