Would the Gazelle be listed as...

velmaisvelma

cross country ski machine? I'm trying to log, but that's the closest I can come up with!

livityliv

I Googled "calories burned gazelle" and this was one of the first results:
http://www.fatburn.com/free_tool_activity_burn.asp

Perhaps find a few of those different calculators, try them out, and average it?? Without a HRM that might be your best bet...

ETA: You can then add that number to your "My exercises" and MFP will do the math for you for various times.

Mokey41

Or use elliptical trainer.

jeaniebear54

Here is the link I use to log my gazelle. http://www.fatburn.com/free_tool_activity_burn.asp

tidesong

Bump. Thanks for the web link!