# Categorised Climbs and More

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• plotaroute admin   Thursday 30 Jan 2020 09:15:06

Hi Marcos - I don't know how grand tour Climb Categories are worked out, but these are the rules that we use...

To work out the Category of a climb, we multiply the length of the climb in metres by the gradient of the climb in percent to determine a score. This score is then used to determine the Category as follows:

 Category 4 8000 or above Category 3 16000 or above Category 2 32000 or above Category 1 64000 or above Hors Catégorie 80000 or above

For example, a climb that goes on for 1km at an average gradient of 12.5% has a score of 1000 x 12.5 = 12500, which equates to Category 4.

• Marcos Saad Thursday 30 Jan 2020 14:39:56

I'm not sure it the article from Bicycling  of September 2014 is acurate but it states:

```According to European cycling tradition, climbs fall into four categories based on their difficculty; a fifth, hors (above category),
is reserved for the most difficult routes. Here'S the breakdown CAT 4 ' "These easier Climbs have average grades of 2 to 3 percent over 3 miles, or up
to 5 percent for climbs shorter than a mile CAT 3 Climbs with rates that average less than 5 percent over 6 miles or much shorter ascents up to
10 percent CAT 2 Ascents up to 4 percent over 9 miles or with an 8-percent grade over 3 miles CAT 1 Climbs up to 12 miles long at 5 percent or 5-mile
pitches at up 8 percent HORS CATÉGORIE Average grades of 7 percent over at least 6 miles or 6-percent grades that span 15 miles or more—C.J. ```

Regards,

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