I don't think it takes RMR into account - that would affect what you want your net calorie goal to be (someone with a higher RMR would need a higher net calorie count, I think). Using your example, it would be

Eat 1800 calories
subract 1000 for yoga and running
___________
Net calories - 800

You would want to eat an addition 400 calories for the net to equal 1200.