What does 1.0 calories means on a stationary bike?

Answer 1

Calories is a measurement of energy. Calories listed on food tells you how much energy there is in that food. Calories listed on an exercise machine will tell you how much energy you've used up.

One calorie is a tiny, tiny amount. A cupcake can easily be more than 400 calories.

Answer 2

Depends on how hard and how long you ride, can be anything between 300-1 200 calories/hour,