A typical 8-ounce (about 240 ml) cup of brewed coffee contains approximately 80 to 100 milligrams of caffeine, with an average often cited around 95 mg

. However, the caffeine content can vary widely depending on factors such as the type of coffee bean, brewing method, grind size, coffee-to-water ratio, and brewing time. For example, a 12-ounce cup can contain between 113 to 247 mg of caffeine

. Here is a summary of caffeine content by coffee type per typical serving size:

• Brewed coffee (8 oz): ~80–140 mg caffeine, average ~95 mg
• Espresso (1 oz shot): ~63–127 mg caffeine (a double shot can have 200–300 mg)
• Instant coffee (8 oz): ~30–90 mg caffeine
• Decaf coffee (8 oz): ~2–15 mg caffeine

Thus, the caffeine content in a "cup" of coffee generally ranges from about 80 to 140 mg, with 95 mg being a common average for an 8-ounce serving

. If you want a stronger caffeine kick, some specialty or "strong roast" coffees can have over 180 mg per cup

. In summary, expect around 80 to 100 mg of caffeine per standard 8-ounce cup of brewed coffee, but this can vary significantly based on preparation and coffee type.