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 milligrams. However, this amount can vary widely depending on factors such as the type of coffee bean, brewing method, and strength of the brew. For example, brewed coffee can range from about 70 to 140 mg per 8-ounce cup, while espresso contains about 63 to 127 mg per 1 to 2-ounce shot, and instant coffee generally has less caffeine, roughly 45 to 75 mg per 6 to 8-ounce cup
. In summary:
- Standard brewed coffee (8 oz): ~80–100 mg caffeine (average ~95 mg)
- Espresso (1 oz shot): ~63–127 mg caffeine
- Instant coffee (6–8 oz): ~45–75 mg caffeine
- Decaffeinated coffee (8 oz): 2–15 mg caffeine
These variations depend on brewing time, coffee variety, grind size, and serving size
