My calculated results were pretty much bang on. A 2000m race for me was 6:33 at my best with body weight of 80 kg. Try entering your 6:30 or 7:00 mm:ss max cycling power in the calculator and check it again. The world record for the 2000m indoors is 5:35 and a good time is under 7:00.
That put me just over 56.
So now I have another number. More of a curiosity for me anyway.
According to my recent test, that calculation was +/- 1 from the lab.
Stay the hell away from it