How many units of Botox for forehead and crows feet area?

The average person requires about 20 units to treat horizontal forehead "worry" lines, 12 units to treat periorbital "crows feet" around the eyes. Despite having said that, however, there really is no such thing as the "average person." I have been treating patients with Botox for aesthetic reasons since 1991 and have found that individual variations can be considerable and optimal treatment results depend upon respecting and addressing these individual variations, rather than depending, as so often do novice injectors, on a "cookbook" approach to treating everyone. Make sure you vett your physician well and ask to see his/her before and after photos before agreeing to proceed. Good luck to you.. 

This is kind of a tough question to answer without seeing a photo and examining the strength of your muscle, but in general I will do 10-20 units around the eyes and 10-25 units in the forehead.  Sometimes, the placement of the injections is more important than the actual amount.  For new patients, I like to undertreat at first so we can figure out what dose is best going forward.  After we know what you like, we do the same thing every time!

Without pictures it is difficult to determine the amount of Botox you will need.  On average I use 12-15 Units on the forehead and 8-12 around each eye for crows feet.   You can always add more botox, but you can not remove it.   An experienced injector will start low and re-evaluate you in 2 weeks.  Best of luck!