Complete Running Calculator Suite 2025

Calculate your pace from distance and time. Get splits, speed conversions, and training pace recommendations.

Predict your finish times for 5K, 10K, half marathon, and marathon based on recent race performance.

Calculate your aerobic capacity using Cooper test, running performance, or Rockport walk test methods.

Calculate your 5 heart rate training zones using age-based formulas or measured max HR for optimal training.

Calculate VO2 max from 12-minute run distance. Includes fitness level classification and improvement tracking.

Convert between treadmill speed (mph/kph) and running pace (min/mile or min/km). Includes incline adjustments.

Find your optimal Zone 2 heart rate for aerobic base building and fat oxidation training.

Calculate LTHR for more accurate training zones. Better than age-based estimates for experienced runners.

Calculate calories burned running based on distance, pace, weight, and terrain. Includes METs calculation.

Calculate training stress score (TSS) and training load to optimize recovery and prevent overtraining.

Calculate optimal recovery time between workouts based on training intensity and duration.

Calculate optimal run-walk intervals for beginners and race strategy. Includes Galloway method ratios.