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It's not that easy to calculate how many calories you burn in yoga and Pilates since the intensity of the class depends on the kind of exercises being done and the strength level of the class participants.

In general, a 130-pound person would burn approximately 260 calories an hour for a light to moderate Pilates mat-class and 236 calories for a yoga class. "Intense" Pilates would burn approximately 346 calories while an intense yoga class would burn about 400 calories per hour.

Your weight affects how many calories you burn (the more you weigh, the more calories you burn), so use the following formula to make it more accurate: Divide the number of calories burned by 130 pounds. Multiply the answer by your weight in pounds.

For example, divide 260 calories by 130 pounds. The answer is 2 calories per pound. Multiply that by 110 pounds. The answer is 220 calories.
http://www.tinajuanfitness.info/articles/031604.htm

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