Research shows that instant coffee usually contains less caffeine than regular coffee. One 6 oz cup contains roughly 45 mg or an average of about 57.1 mg. Although the name may be deceiving ...
A powerful shot of espresso (1 ounce, or 29.57 milliliters) may have less caffeine than a 6-ounce cup of brewed coffee—approximately 64 milligrams. However, espresso has more caffeine per ounce ...