Running & Race Training
Advanced running calculators for marathon training paces, race prediction, elevation adjustment, tapering, and performance analysis.
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Marathon Training Pace Calculator
Calculate training zone paces (easy, tempo, interval, repetition) from your goal marathon time using Daniels' VDOT methodology.
Race Predictor Calculator
Predict race finish times across distances using the Riegel formula. Enter a known race result to estimate times for 5K, 10K, half marathon, marathon, and ultra distances.
Elevation-Adjusted Pace Calculator
Calculate your grade-adjusted pace for hilly courses using elevation gain and loss data. Based on physiological cost of running uphill and downhill.
Running Economy Calculator
Calculate your oxygen consumption (VO2) at a given running speed to assess running efficiency. Compare your economy against benchmarks.
Shoe Mileage Tracker Calculator
Track your running shoe mileage and predict when it is time to replace them. Most shoes last 300-500 miles depending on shoe type, runner weight, and running surface.
Heat-Adjusted Pace Calculator
Calculate how heat and humidity affect your running pace. Get an adjusted target pace and heat risk assessment for hot weather running.
Interval Training Calculator
Design structured interval workouts for VO2max, threshold, and speed sessions. Get target paces, work and rest durations, and total session time.
Ultra Marathon Nutrition Calculator
Plan calories, electrolytes, and fluid intake per hour for ultra marathon distances. Get personalized nutrition targets based on weight, pace, and conditions.
Race Taper Calculator
Plan your pre-race taper with a week-by-week volume reduction schedule. Optimized for 5K through ultra marathon distances.
Age-Graded Performance Calculator
Calculate your age-graded running performance score. Compare your race time against age and gender standards to see how you rank and what your time equates to at any age.