StrideForever

Free, fast running calculators.

• Running Pace Calculator

  Calculate your running pace per km and per mile from any distance and time. Free, instant pace and speed calculator.

• Race Time Predictor

  Predict your race finish time for 5K, 10K, half and full marathon from a recent result using the Riegel formula.

• Splits Calculator

  Get even per-km or per-mile splits for any goal finish time and race distance.

• Training Pace Zones Calculator

  Calculate easy, marathon, threshold, interval and repetition training paces from your threshold pace.

• Treadmill Pace Converter

  Convert treadmill speed in mph or kph to running pace per km and per mile.