Fair KM

Trail races at a fair price.

Find races worth the effort, and the people who've really run them.

How we measure price

Climbing counts: every 100 m of D+ equals 1 km.

km + D+ ÷ 100 = km-effort

price ÷ km-effort = cost per km-effort

Example: 50 km with 3,000 m of D+ = 80 km-effort.

This is ITRA's km-effort, the measure of effort used in trail running.

One colour, at a glance

Each distance is compared with the reference race in its country, for the same effort.

Race pages built for trail running

Everything you need to choose and prepare, in one place.

Verified data, real advice