Calculators abound. They base the calculation on your weight, time doing activity and finally that activity itself. Finding that seed number list is what I am wondering about.
Taking the run at 6 miles per hour and putting in a weight of 22 kg and a time of 10 min. shows the burn at 38cals. 46 kg raises that to 76 cals.
What is missing is the seed number for how intense of the exercise. There is an acronym METs which stands for Metabolic Equivalents, which does just that.
Calories burned by exercise = ((METs * 3.5 * weight in kg) / 200) * duration in minutes.