# To Calculate the height and ascent between two points

work out the height of each then subtract the lower from the higher.

This will NOT necessarily represent the ascent you will make from one to the other – the ground between the two points may undulate, making the ascent greater.

In the first diagram the blue line on the right indicates the vertical height difference between point A and point B (wavy blue line shows outline of land and horizontal lines show where contour lines would cross the landscape)

In the second diagram the blue stars indicate where a contour line is crossed going uphill. In this example the actual ascent is more than twice the height difference.

To calculate the ascent you will make going along a route count the number of contour lines crossed going up hill then multiply this number by the contour interval.