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.