Typically, the average adult will use aprox 40 units. A good rule of thumb is to take your age and replace it with units. For example, if you are 40 yrs old then you will need 40 units, 50 years old would be 50 units. This is not an exact science but can give you a rough idea of what to expect. I will perform a pre-treatment consultation with you either in person or virtually to determine your areas of concern, what product to use and how much will be needed to obtain this desired look and the cost associated with it.