Yes, regular instant coffee has less caffeine than brewed coffee. Typically brewed coffee has an average of 95 mg of caffeine per 8 ounces, while regular instant coffee has an average of 60 mg of caffeine per 8 ounces. The caffeine content will also vary depending on the type of roast, brewing method, and bean. Decaffeination removes about 97% of caffeine from coffee beans, so decaf instant coffee would contain less than 2 mg of caffeine per 8 ounces. You are still going to get a little big of caffeine from decaf instant coffee, but not as much caffeine as regular brewed decaf coffee.