0 calories per 12 fl oz serving. Enter code (at) mycokerewards.com. Caffeine Content: 46 mg/12 fl oz. Consumer information call 1-800-438-2653. www.dietcoke.com. SmartLabel. Scan for more food information. mycokerewards.com. Code under cap. Enter online. See rules online. Please recycle. Tastes great ice cold.