Data Tools for Runners
Practical running calculators for calories, pace, race predictions, splits, VO2 max, and heart rate training zones.
Running Calorie Calculator
Estimate run calories from weight, distance, duration, pace, and elevation.
Running Pace Calculator
Calculate running pace, speed, minutes per mile, and minutes per kilometer from distance and finish time.
Race Time Predictor
Predict race finish times and target pace from a recent race result using a Riegel-style endurance formula.
Running Split Calculator
Calculate even running splits for races and workouts from distance, target time, and split interval.
VO2 Max Calculator
Estimate VO2 max from a 12-minute Cooper run distance using the common field-test formula.
Heart Rate Zone Calculator
Calculate running heart rate training zones from age-estimated or known maximum heart rate.
Pace vs Speed for Runners
Learn the difference between running pace and speed, when to use each metric, and how to convert between them.
How to Calculate Running Pace
Calculate running pace from distance and time, with examples for miles, kilometers, races, and workouts.
Zone 2 Running Heart Rate
Understand Zone 2 running, how heart rate zones are estimated, and why easy aerobic training varies by runner.
VO2 Max for Runners
Learn what VO2 max means for runners, how field estimates work, and why race performance depends on more than VO2 max.