Fuel the effort,
not the distance.

Most race plans spread fuel evenly across the kilometres: a fixed number of grams and millilitres per hour, or per checkpoint. That works on a track. It falls apart in the mountains.

A runnable 5 km on rolling ground and a 5 km grind up 1,000 m of vert are not the same effort — one might take 30 minutes, the other two hours. Your body burns and sweats by time on feet, not by distance covered. Plan by distance and you'll under-fuel the climbs and over-carry on the descents.

Ultra Planner estimates the time you'll spend on every segment between aid stations — weighting distance by elevation — and allocates fluid, carbs, and sodium against that. Steep, slow segments get more; fast, flat ones get less. The result is a per-segment plan that matches what your body actually does out there.

Add your gear and it goes one step further: whole-unit suggestions per leg — how many gels, how much drink mix, which salt caps — with the achieved-vs-target gap shown so you can tune before race day, not during it.