FluxRun AIFree running calculators
Quick, free tools for runners: work out your pace, predict race times, find your heart rate zones and plan run/walk intervals. Works in kilometres or miles.
Running pace calculator
Pace, time or distance from the other two, with splits.
Race time predictor
Your likely 5K, 10K, half and marathon times from one result.
Heart rate zone calculator
Your 5 heart rate zones from age or max heart rate.
Run/walk interval calculator
Average pace and finish time for run/walk intervals.
Couch to 5K plan
From walking to running 5 km in nine weeks.
10K plan for beginners
From 5 km to 10 km in eight weeks.
Half marathon plan
From 10 km to 21.1 km in twelve weeks.
How to start running
A short guide for total beginners.