Machinehead LevelCalc (32 bit)

Here is a rather spartan Javascript version of the LevelCalc heart rate calculator. This one calculates heart rate values based entirely upon the BCF/Peter Keen guidelines.

With the one important change to allow people who have no idea what there maximum heart rate (MHR) is can estimate from the equation MHR=220-age.
LevelCalc is better - but only if you can run Windows software. I use the BCF method because it "feels" right. All I really need to do to achieve my own personal training goals is to spend as much time as possible at level 2, with my pedals spinning at a cadence of around 90 rpm.