Why do different cycling calorie calculators give out different answers, often multiplication of one with a fixed number?

Question

I’m overweight and trying to lose weight via diet and stationary cycling but I’m confused with different calculators

if

Stationary bike says 100 calories (no weight input)

online calculators say 200 400 600 etc asking me the same info including weight

In: 4

Answer 1

There are multiple factors that can affect the number of calories burned while cycling, including weight, intensity, and duration. Different cycling calorie calculators may use different formulas to estimate the number of calories burned, which can account for some of the variation in results. Additionally, some calculators allow you to input your own variables (such as weight and intensity), while others use fixed values, which can also affect the final calorie estimate.