Free tools to help you train smarter, race faster, and understand your running.
Calculate the missing pace, finish time or distance from two known values.
Calculate five training zones using %HRmax or Heart Rate Reserve.
Get bounded training pace guidance from a recent race or hard time trial.
Predict an equivalent performance at another supported race distance.
Build even, negative or positive splits for a target finish time.
Calculate overall finish time for a repeating run/walk pacing strategy.
Calculate a performance-derived Running Fitness score from a race result.
Compare a road-race result with age- and category-specific standards.
Convert target pace into repetition times or repetition times back into pace.
Install Run365 on your iPhone in four easy steps: