Pace Calculator
Calculate running pace in min/km, speed in km/h, distance or finish time – with presets for 5 km, 10 km, half marathon and marathon.
Endurance & Running
Calculators and tools in the Endurance & Running section.
Running
Calculators in the Running topic.
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Running Age Grade Calculator
Calculate Age Grade and Age Adjusted Time using the 2025 CC0 WMA/USATF Road Running Standards for 1 mile to marathon.
Running Prediction Calculator
Predict target time for other distances from one running result – 5 km, 10 km, half marathon, and marathon using the Riegel formula.
Endurance Diagnostics
Calculators in the Endurance Diagnostics topic.
Heart Rate Zone Calculator
Calculate your five heart rate training zones from estimated or measured maximum heart rate – as a percentage of HRmax or using the Karvonen formula with resting heart rate.
VDOT & Training Pace Calculator
Calculate a VDOT model value and pace ranges for Easy, Marathon, Threshold, Interval and Repetition from race distance and time.
VO₂max Calculator
Estimate your VO₂max from the 12-minute Cooper test or from a race time and assess your aerobic endurance.
Hiking & Outdoor
Calculators in the Hiking & Outdoor topic.
Hiking Time Calculator
Estimate walking time for a hike from distance, ascent, and descent – using Naismith's rule or the SAC/DAV method.
Rowing
Calculators in the Rowing topic.
Rowing Ergometer Calculator
Convert /500 m split on the rowing ergometer to watts and estimate target time for a distance. Based on the Concept2 model Watts = 2.8 ÷ Pace³.