Yes and that’s why I’m curious how the Elemnt calculates both of them. If the calories aren’t as reliable because it uses strictly HR for calories but it turns out that it reports kJ correctly then I can simply monitor kJ during my rides. I’ve already explained this in this thread. As long as kJ is reliable then I have a good indicator for calories burned. I know it’s not always a 1:1 ratio but it’s awfully close...close enough for me. It’s also how my 520 calculates calories....kJ=calories on the 520.