Horizon calculator

This calculator gives you the range from which a distant peak can be seen under normal atmospheric conditions:

  Enter altitudes below:
Enter your altitude =
Enter distant peak altitude =

Variations of air temperature & humidity with height will change this distance. For example, a temperature inversion can increase it quite sigificantly. Temperature inversions tend to be more common over the sea due to the cooling effect of the water & more often occur when atmospheric pressure is high during the winter months.