What is the formula for calculating pressure as a function of height?

[Micko]

Hello people,
I know that normal athmosferic pressure on the sea level is 101325 Pa.
However I need to know how pressure is changed with height. I know, for example, that on 200 m above sea level it will be smaller but how much I don't know.
Can you suggest forumula? i think it can be approx. linear but don't know slope.
Thanks for help.

 

[Bystander]

http://hyperphysics.phy-astr.gsu.edu/hbase/kinetic/barfor.html

 

[quark]

Formula from the bureau of mines is
Pamb = [(44331.5-Z)/4946.624]^1/0.190263
This equation is valid upto 10 km height. P is in Pascals and Z is height above mean sea level in km.