If you like metric, a good approximation is also 1 calorie per kilometer and kilogram of body weight. So a 80kg person running a 10k will approx. burn 800 calor

If you like metric, a good approximation is also 1 calorie per kilometer and kilogram of body weight. So a 80kg person running a 10k will approx. burn 800 calories. Only an approximation but seems to roughly fit many "measurements" by smart watches for both males and females of different weight ranges.