Running Calculators
The same pace algorithms I use for my own marathon preparation. Race predictors, training zones, and more.
Age Grade Calculator
WMA age-grading: compares performance to age/sex world record.
Try CalculatorBoston Qualifying Calculator
BAA qualifying times by age and gender.
Try CalculatorCooper Test Calculator
Cooper Test: 12-minute run.
Try CalculatorCritical Speed Calculator
Critical speed from two time trials.
Try CalculatorElevation Adjusted Pace
Adjusts running pace for elevation changes.
Try CalculatorMagic Mile Calculator
Jeff Galloway Magic Mile: Mile time x multiplier predicts race times.
Try CalculatorMarathon HR Pacer
Target heart rate zones for marathon pacing.
Try CalculatorNegative Split Calculator
Negative split strategy: run the second half faster than the first.
Try CalculatorOCR/Spartan Race Estimator
Estimates OCR finish time: Base run time + obstacle time (30-90 sec each).
Try CalculatorPace Band Generator
Creates a printable pace band showing target split times at each kilometer for your goal finish time.
Try CalculatorRace Day Nutrition Planner
Race nutrition: 30-60g carbs/hour for 1-2.
Try CalculatorRace Equivalence Calculator
Compares race performances across distances using age-grading and distance factors.
Try CalculatorRace Time Predictor
Riegel formula: T2 = T1 x (D2/D1)^1.
Try CalculatorRun/Walk Calculator
Galloway run/walk method: Run X min, walk Y min.
Try CalculatorRunning Calorie Calculator
Estimate calories burned running based on your weight, duration, pace, and terrain.
Try CalculatorRunning Pace Calculator
Pace = Time / Distance.
Try CalculatorRunning Split Calculator
Generates per-kilometer split times for any distance.
Try CalculatorShoe Mileage Tracker
Running shoe lifespan: 500-800 km for most shoes.
Try CalculatorSteps to Distance Converter
Converts steps to distance using stride length.
Try CalculatorStride Length Calculator
Estimates stride length from height.
Try CalculatorTaper Calculator
Race taper: reduce volume 40-60% over 2-3 weeks while maintaining intensity.
Try CalculatorTemperature Adjusted Pace
Adjusts running pace for heat.
Try CalculatorTraining Pace Calculator
Training pace zones based on VDOT methodology.
Try CalculatorTreadmill Pace Converter
Converts treadmill speed (km/h or mph) to running pace (min/km or min/mi) and vice versa.
Try CalculatorUltra Distance Calculator
Predicts ultra-marathon times (50K, 100K, 100mi) from marathon time.
Try CalculatorVO2max Calculator
Estimates VO2max from race performance using Jack Daniels VDOT tables.
Try CalculatorDone calculating? Start training.
Use your pace data to generate a personalized race plan.
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