Calc4Runner it's a converter designed for people who love running. Using this application you can calculate your BMI (body mass index) and HRmax (maximum heart rate).
Calc4Runner also estimate (based on the formula written by Peter Riegel) the probably time that you reach during the competition at various distances (including the 10km, half marathon or marathon).
Calc4Runner also calculates heart rate for each training zone explaining how to achieve own goal.
This calculator also converts pace to speed. In running we have pace in min/km (the number of minutes per kilometer) not speed in km/h (kilometers per hour) or mph (number of miles per hour). We find pace in the results of the competition, in heart rate monitor or applications like Endomondo. If we want to find out how speed we have
in training or in the competition simply just use this application.