Tools - EN
Compare a mountain route to a flat one using a GPX profile and energy cost model.
A 100 km mountain race with 6000 m of elevation gain is not just 100 km. Your legs, lungs, and race clock will tell you it felt like much more. This tool calculates that real effort: how many flat kilometers your mountain route actually equals. Use the result to set realistic pacing, compare routes, and plan training volume that matches what race day will demand.
Profile calculated from GPX file.
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The calculator converts a mountain route into a flat-equivalent distance. It starts with the GPX slope profile, estimates the extra cost of climbing and descending, then applies a surface adjustment for runnable, mixed, or technical terrain.
Use it as an effort estimate, not as a promise of exact race time. A 60 km route with steep climbs may behave like a much longer flat run in your legs and recovery.
Use it when comparing races, planning long-run volume, estimating how demanding a mountain route really is, or deciding whether two routes are comparable.
It is especially useful when official distance hides the real load: short steep races, long climbs, repeated descents, or technical terrain where raw kilometers understate the day.
Read the final equivalent as the approximate flat-road distance that would create a similar endurance demand. If the route is 80 km but the equivalent is 120 km, plan effort, fueling, recovery, and cut-off margins closer to the larger number.
Compare the GPX-only value with the final value. A large gap between them means terrain technicality is doing meaningful work, not just elevation gain.
The calculator cannot know weather, mud, altitude, heat, underfoot grip, navigation errors, or how well you descend when tired. Those factors can move the real cost in either direction.
The model is most useful for planning and comparison. For pacing on a single climb or descent, use the GAP calculator instead.
No. Flat-equivalent distance describes the total cost of a route. Grade-adjusted pace describes the effort of a pace on a particular gradient.
Use both. The official distance matters for time on feet and logistics, while the flat equivalent helps you judge the training load and recovery cost.
Technical ground slows you down and adds muscular and cognitive cost. The adjustment keeps the estimate closer to what runners usually feel on real trail terrain.
Training plans
You see how far your route really is in flat terms. A tailored plan builds the fitness you need for every meter of it.
Free preview included
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