The intensity of an elliptical workout depends on a combination of speed and resistance. One of the problems with any online calculator estimating calories from an elliptical is that it has no idea of the resistance.
Spark's calorie calculator assumes that calorie burn is proportionate to body weight. For most activities (eg. running, walking, aerobics), this is pretty reasonable. But for the elliptical, where you are working against the resistance of the machine rather than your body weight, this can produce some seriously distorted results, especially for heavier people.
I would definitely recommend going with the more conservative of the machine estimate and Spark's estimate.
The reasonable man adapts himself to the world; the unreasonable one persists in trying to adapt the world to himself. Therefore all progress depends on the unreasonable man.
| current weight: 178.0