Calorie-Count About.com Health
Calories Burned for Activity: Bicycling
Stationary, 200 Watts, Vigorous Effort

714 calories per hour

Assuming a body weight of: 150 lbs
This is equivalent to eating any of the lines of the following table.

Quantity Description Cals
2.7 Grande Starbucks Caffe Latte - Made with whole milk 260
1 McDonald's Big Mac - With cheese 704
9 Glasses of wine (3.5 fl oz) 79
2.6 Snickers Bar 273
3.4 Cans of Coca-Cola 207
23.8 Carrots 30