Smart tools for smart runners

A fast, accurate toolbox to compute pace, plan your next race and progress. No signup required, 100% free.

Pace calculator, race predictor, HR zones, VO₂max, calories and splits. Simple, accurate tools for runners.

  • Pace calculator - Convert pace, time and distance in min/km or min/mi with automatic splits.
  • Race time predictor - Predict your 5K, 10K, half and full marathon times from a recent race (Riegel).
  • Heart rate zones - Compute your 5 heart rate zones using the Karvonen (HR reserve) method.
  • VO₂max estimation - Estimate your VO₂max from a race time (Daniels & Gilbert).
  • Calories burned - Estimate calories burned from weight, duration and intensity (MET method).
  • Split planner - Build a per-km pacing plan (even, negative or progressive splits).
  • Conquer your territory
  • Clubs & Community
  • Quests & Events
  • Detailed analytics
  • Every stride counts
  • Leaderboards
  • Precise GPS capture
  • Global coverage
  • Trail & Adventure
  • iOS & Android
  • RPG System
  • Build your routes
  • Quests & Achievements
  • Pace calculator
  • Race time predictor
  • Heart rate zones
  • VO₂max estimation
  • Calories burned
  • Split planner