Join Date: May 2007
Location: Santa Cruz Mountains
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Ride 1: 92 minutes, 234w avg, 168bpm avg. formula: 294
Ride 2: 42 min, 159w avg, 148bpm avg. formula: 243
Ride 2 was the warmup for ride 1, a climbing race.
Conclusion: don't waste your time with this web site. Using HR to calculate power is incorrect. Their suggestion of using your bike computer's estimate of calories burned is no better. HR can't be used in this context as there is too much variability between individuals.
If you want to train with power, you need a real power meter. Or, depending on what you want to use the data for, you can use RPE.