Don't get me wrong cyclings if fabulous for fitness and will help lots of people,but for many the body normalises and you stop loosing weight (the hours I've spent on a stationary to loose practically zero)
There is and activity calculator here..... you plug in your weight, the activity (there are loads of different ones - click on activity link middle of the page).
http://www.caloriesp.../index_burn.php
Like most calculators they give fairly blunt repose (which needs to be kept in mind with your daily life activity level). You need to differentiate for your own body, the impact of activities where your body weight is begin moiblised by something else (ice skating, roller balding, cycling) and the ones where your body is carrying the mass, jogging, skipping etc. If I want to loose weight and get thin, I do skipping and ballet. I love cycling but it simply doesn't burn weight for me (and for many others - I also love ice skating which burns more than cycling does).
Skipping is usually called jumping rope on these things. It's hideous when you first try it, but build up is super quick.
I do 40mins a day - spread out in 3 or 4 blasts. I can cycle 2 hours a day and not get the same weight loss the skipping will give me.
Personally I think skipping slower regular beats kills me more than fast... but hell it is all pretty intense.
Skipping is not good for joints, not is jogging and to a lesser extent cycling. If you have bad joints then brisk walks again where you are carrying your own body weight is again effective.
Professional opinion was the dietician last week who instructed me to cut way back on cycling and ramp up on skipping (I might add I'm a pretty healthy person).
My bro and his partner cycled from Edinburgh to Tasmania a few years back, and both of them concur that cycling will only help partly because your body nomalises
Finally a boxing gym savvy mate also says the reason cycling wont loose weight is due to the bike carrying your weight (much like skating), and your body working out limbs rather than your limbs carrying the full impact of your body weight.
I keep an accurate food dairy on my phone and exercise via HRM/Cadence Unit and various diaries over time, so yes I can see what impacts more than others