Running tools

Free calculators built for runners who want clearer training decisions: estimate paces, set heart-rate zones, predict race times, estimate VO2 max and understand calories burned. Pick the tool you need and get started in seconds.

Pace calculator

Get kilometer or mile paces with a negative-split plan for 5K, 10K, half marathon and marathon.

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Heart rate zone calculator

Calculate training zones with Karvonen, % max HR or Zoladz so every session has the right intensity.

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Race time predictor

Estimate your finish time at any distance from a recent result using the Riegel formula.

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VO2 max calculator

Estimate your VO2 max with validated methods and better understand your aerobic fitness.

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Running calories calculator

Calculate calories burned while running based on weight, distance, pace and session conditions.

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