coordinate system - Converting distance to coords?

I want to convert a coords interval (especially latitude) to real distance.

I mean let's say we stay at the exact same longitude, but with 1 degree of difference in latitude.

How many kilometers/meters/whatever does this 1-dimensional bounding box amount to?

Is there some type to do the conversion?

Answer

I will atempt to answer your questions in three different ways:

1. 
   

   A degree of latitude is approximately 111 km. It varies from 110.567 km at the equator to 111.699 km at the poles. Taken from here.

   
   


2. 
   

   You can calcutale it yourself online here at NOAA.

   
   



3. 
   

   This previous answers undertakes the background of the calculations you are asking for http://gis.stackexchange.com/questions/75528/understanding-terms-in-length-of-degree-formula/75535#75535