Race Weight Calculator

Food weight is derived purely from calories needed, and calories are modeled as a rate — 300 calories burned per hour of racing — multiplied by your expected duration, then converted to grams at roughly 4.5 calories per gram of dense trail food. Distance only matters insofar as it determines how long you'll be out there, so enter your best duration estimate even if it doesn't map linearly to the distance you entered. In fact, the Race distance field itself is not read by the calculation at all — it's collected for your own reference and shown in the worked steps, but it does not currently affect any of the outputs above.

A lot — if sources are marked available, the calculator only sizes your water carry for 3 hours between refills at a temperature-based rate of 0.5 to 1.0 liters per hour. Mark yourself self-supported instead and it sizes water for your entire per-day racing duration (total hours divided by number of days), which can add several extra kilograms for a long, self-supported single-day race.

Only navigation gear and 30% of the mandatory safety kit are treated as shareable, split evenly across team size and subtracted from the per-person total. Food, water, clothing, sleep systems, and the remaining 70% of mandatory gear are still counted in full for every team member, since those items can't practically be handed off mid-race.

Multi-day events add fixed items a single day doesn't need — a sleep system (1.0 to 1.8kg depending on temperature) and a larger pack (1.2kg versus 0.6kg for single-day) — so crossing from Number of days = 1 to 2 adds roughly 2-3kg on its own, regardless of how the total distance is split across those days.