What is energy output in Strava application? I'm 115 kg. Today I took two bicycle rides:


42:41 time, 12.1 km distance, 72 m elevation, 17.1 km/h avg. speed, 33.1 km/h max. speed,
50:50 time, 11.7 km distance, 17 m elevation, 13.9 km/h avg. speed, 32.8 km/h max. speed.


Strava calcualted folowing figures about energy in each of these rides:


first: 405 calories / 363 kJ energy output,
second: 353 calories / 317 kJ energy output.


Ever since I remember I was always told, that 1 kcal = 4,1855 kJ. So these numbers are weird or incorrect. What is energy output in Strava or in general?
From Strava's Help page :


  Energy Output
  
  Energy Output measures the amount of work you've done during a ride,
  expressed in kilojoules (KJ). It is a factor of how much you're
  pedaling, how fast you're pedaling and how much force you're exerting
  on the pedals (measured in W). Power output is most accurately taken
  from a power meter, but if you don't have a power meter we give a
  rough approximation through our power estimator.


This means how much energy was delivered to make the wheels turn. As Daniel R Hicks mentioned, calories in that case mean how much "food" energy your body burned, which will always be higher than the energy you give to the wheels.