The fence is calculated by how long the fence will be. It is measured by linear feet. The prices vary between $16/ft. to $25/ft. This does not include the self closing self latching gates. Gate usually costs about $400. 
 
There are some other variables might add on to the overall cost such as gates, concrete footings and steps. There are also different grades of fence available on the market. Some companies use hollow aluminum poles, others use re-inforced or solid aluminum poles. The stronger the pole, the more pressure it will take before breaking.