Free Trail Running Calculators

Convert trail gradients between %, degrees, ratio, and rise/run. See the Minetti energy cost and power hike threshold.

Predict your trail race finish time using ITRA km-effort, ultra fatigue modeling, and terrain multipliers.

Convert running pace between min/km, min/mi, km/h, and mph. Includes a splits table with trail distances up to 100km.

Find your grade-adjusted pace for any slope. Two modes: discover your flat effort equivalent, or target a pace at a given gradient.

Enter your race checkpoints and goal time to get estimated arrival times at every aid station, segment paces, and hiking zones.

Calculate your ITRA km-effort and unofficial performance score for any race result. See your indicative UTMB stone tier.

Get hourly calorie, carbohydrate, fluid, and sodium targets for your trail race. Adjusts for intensity, heat, and altitude.

Upload a GPX file to see your route on an interactive map, explore the elevation profile, gradient heatmap, and waypoints. Get full race stats including km-effort score.

Build a custom sports drink from bulk ingredients. See glucose:fructose ratio, osmolality, and concentration in real time. Load brand presets to understand what commercial products contain.

See exactly how temperature, altitude, and night running inflate your trail race time - broken down factor by factor for UTMB, CCC, Lavaredo, Hardrock, and Western States.