SPINNING - IS THE EXCERISE TRACKER RIGHT?

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Hello,

I was just wondering if anyone could help me with the Excerise tracker bit of the website for spinning?

It says that I burn 274 cals for 30min of spinning which I have never questioned before, until I was at the gym the other day on the cross trainer and for a 10min session it said I burned 154! Which made me think I must be burning more at spinning it is much more intence, you are doing sit ups while on the bike and it makes you sweat buckets!

If it is correct then that's fine but I was wondering if it maybe wasnt correct?

Thanks

Jo