For well-studied activities like walking and biking, in general, yes.
in your estimate, though, it's important to know what you're counting; biking to and from work may be exercise for some, but if you've been doing it a long time, it may not be as challenging for you as others, and your burn may be lower.
What's the estimate that it's giving you? For walking, a good rule of thumb is around 100 calories per mile (give or take a bit.)
Writer, mother, wife, and breadwinner. I love to run, but running doesn't love me, so I'm switching to my low-impact bike.
I'm not pregnant, just fat: My blog. fatnotpregnant.blogspot.com/
| current weight: 186.4