Use our nicotine calculator above to find out how much nicotine base you will need to add to your RTV (Ready to Vape) juices. All you have to do is enter the strength of your nicotine base, the size of your bottle of flavoured juice and your desired nicotine strength and then the nicotine mixing calculator will tell you how much nicotine base to add to your juice. Don’t let the image above fool you, mixing nicotine into your eJuice is easy with our nicotine calculator.