Dilution Guide Chart for Essential Oils in Carrier Oils. The following chart is a guide you can use to help you dilute your essential oils into your favorite carrier oil. Since essential oils are concentrated, a little can go a long way. With this chart you get to create your own recipes based on your preferences for scent and strength. The usual recommendation is to dilute at 2%-3% for regular, healthy adults. Learn more about essential oil dilution rates here!