It depends how hard you work and how much rest you take. Below is an estimate of how many calories you can burn during a 30-minute strength training session (general) or vigorous power lifting session.
Ainsworth BE, Haskell WL, Whitt MC, et al. Compendium of physical activities: an update of activity codes and MET intensities. Med. Sci. Sports Exerc., Vol. 32, No. 9, Suppl., pp. S498–S516, 2000.
Calorie calculations from equation: (METs x 3.5 x body weight in kg)/200 = calories/minute
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