Free Running Tools

Calculate pace, predict race times, find your training zones, and more. All free. No signup needed.

Convert pace between min/mile and min/km. Calculate race finish times from your pace.

Predict your finish time for any race distance based on a recent race result.

Calculate your training pace zones based on threshold pace or recent race time.

Calculate your heart rate training zones from max HR or age.

14-day free trial · No credit card needed

Want to sync workouts to your smartwatch?

Paicer uses AI to parse any workout image and sync it directly to your smartwatch. No more manual data entry.