Hi,

Is there an online calculator for this? Anyway, I just started cycling to supplement my running and I want to know how intense it is and if I am working hard enough. Today was my fourth day.

Can somebody give me a calorie estimate based on:

125 pounds

Trek 7200fx hybrid bike

relatively flat with 5 small hills, road surface

18 miles in 1 hour 10 minutes

How many calories? Also, how many calories would it be if I do 12 miles at same pace on the same surface?( I'm alternating every other day)

Thanks !