From 80mg to 300mg: Caffeine Across the Category
Caffeine content per standard serving size for major energy drink brands, compared against a cup of brewed coffee for reference. Serving sizes vary by brand, ranging from 8 to 16 ounces, so caffeine density (mg per ounce) differs even more sharply than the totals shown here. Celsius and Alani Nu pack more caffeine per ounce than Monster despite containing less per can.