I have the Tour de France climbing categories formulas so I can directly compare hills in the UK with hills on the TdF.
With ultramodern digital mapping, every meter of a trip can be analysed for terrian. Some Audax Organisers include 'gentle undulations' in their climbing figure. The standard is a 'contour count' using the OS Pathfinder 1:25,000 series maps.
On the Pathfinder series OS maps, contours are at 5 m intervals ( plus some spot heights ). This means there could be undulations of less than 5m lurking between contour lines. In unfortunate cirumstances, an undulating road of 3 m which fluctuates between contours will be unseen by a Contour Count.
If a cyclist cannot cope with a 10ft undualing lane, heaven help him.
For quickness, BikeHike gives an estimate. This is what I use to determine the bottom and top elevations of a significant climb. I type the elev and distance into the TdF formula and get the Cat rating for the climb.
How much elevation BikeHike contains is not known to me. I do not really care that much. Ups-and-downs between significant climbs are ignored.
Bad climbs can easily be seen by viewing the OS map where the contour lines are packed tight. This assists gear choice.
An error in the climbing of 400 m over 100 km less than reality equates to approximately 100 kCals of energy. Best policy is to over-eat by this ammount 'Just-in-case'.
