[Efourdee]

Googled: Walking vs. Running

Here's the answer from Dr. Dean Ornish, a clinical professor of
medicine at UC San Francisco:

"All things being equal, you will burn more calories by running an
hour than walking an hour. It is true that walking a mile will burn more calories then running a mile -- although it takes longer to do
so. When you run a mile, you're burning mostly sugar, or
carbohydrates, which is how your body gives you fast energy in bursts.
When you walk a mile, it gives your metabolism time to switch from
burning carbohydrates to burning fat."

I don't feel like searching for it but if you google V02 max and calories burned you can probably find the formula you are looking for.