New HRM

JRRCLR

I just got a new HRM and have a question...I wanted to test the calories burned from what it tells me on the elliptical and what the monitor tells me. I did 5 minutes the way I usually do and it says I burned about 63 calories. The HRM says I burned 30. Does this seem like a fair trade off? I know that the calorie counters on the ellipticals are usually quite high. I want to make sure my HRM is set up right.
Thanks!