Do the pace math.
Leave the rest to your legs.
Runnin is a free toolbox for runners: pace, distance and time, treadmill converter, intervals, split times, race pacing and heart rate zones. No account, no tracking, no ads.
Works on iOS, Android and the web. In Polish and English, in km and miles.
Everything you need before a run
Tools, not tracking. Runnin records nothing - it does the math you already do in your head.
Pace · distance · time
Enter two values, we compute the third. Shortcuts for 5K, 10K, half and marathon.
Treadmill
km/h to min/km and back, with incline and flat-ground equivalent pace.
Intervals and strides
Rep times to the second: 400 m at 4:00/km = 96 s. Table from 100 m to 3 km.
Split times
Your goal result broken into kilometer splits - with halfway and finish.
Race pacing
Negative, positive or even split - a full pacing plan for race day.
Predictor and HR zones
Race predictions (Riegel formula) and 5 heart rate zones, incl. the Karvonen method.
Why Runnin?
tracking and accounts. Your training is your business.
free, with no ads or in-app purchases.
two languages, metric and imperial units, dark and light mode.
Ready to run faster?
Open Runnin in your browser - it works on your phone too.
Launch Runnin