Cardio Machine Accuracy

[tgrusso78]

Does anyone in here have any idea how accurate the calories burned meters are on cardio equipment? ie Arctrainers? I know it asks for my weight, and that has some bearing on how many calories I burn, but my BMI and other factors also comes into play. I mainly want to know if I see it say 300 calories, if I can at the least assume I've burned say 200? Any numbers based on studies would be great. Thanks!