Cycling... calories burned?

[flootshoot]

So... I've started doing the school run on a bike with a trailer. I'm cycling just over 5 miles with approx 70lbs worth of trailer/child behind me. I'm probably averaging 5 mph what with the stopping and starting to deal with kids. Any ideas how much that burns??

[eggyweggies]

Go onto my fitness pal website- you can input your weight + activity+ speed + time spent and it will tell you.