This is a great question! The best source I have found for determing is: http://www.livestrong.com/​article/​206811-how-many-calories-are-burned-with-one-hour-of-power-yoga/​

There is no set amount of calories burned per class. Every individual is unique and experiences their yoga practice differently. A physical yoga practice is more powerful than "just" burning calories for many reasons.....one of the most important being that as the body lets-go of tension & stress (as the nervous system calms) - the body's metabolism balances. Over long periods of chronic stress (which affects so

(which affects so many people today) the body's metabolism is inhibited. The physical yoga practice can help to alleviate that stress and move the body into metabolic balance - burn more calories. We hope that helps and look forward to seeing you on-the-mats.