Total Calorie burn running = miles*weight*.75
Total calorie burn walking = miles*weight*.53
Burn adjusted for BMR running= miles*.63*weight
Burn adjusted for BMR walking=miles*.3*weight
You need your time taken and distance covered :that will give you your pace.
And your current weight.
Bunches of calculators here.
Go to logging Activities
Type in Walk or run then you need to know how much time and ideally the speed at which you were walking on running but mot important the amount of time. You can guess speed
It will allow you to see how many calories you burned
I use Polar HR monitor that gives pretty accurate calorie burn information as well
Do you have a heart rate monitor? Its key in figuring out if you are working hard enough to burn calories. Below is a link to a heart rate chart
Once you know your heart rate, below is a formula to figure out how many calories you burned.
Or you can get a good heart rate monitor that has the calories burned. Mine is about 10 years old and doesnt have calories on it.