It depends on how much you weigh, how hard you work, and how long you exercise. Below is an estimate of how many calories you can burn during 30 minutes of water aerobics.
Calorie calculations from equation: (METs x 3.5 x body weight in kg)/200 = calories/minute

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FitnessforWeightLoss.com was created by Stephanie Averkamp, a recognized health and fitness professional and sole-author of the content on this website. Stephanie's approach to weight loss emphasizes making small, realistic, and permanent lifestyle changes. Read more...
Our Approach: Short-term solutions (like dieting) are unrealistic and ineffective because at some point they end. As soon as a diet or program ends, so do the results. Permanent weight loss is a journey; it's not a race or competition and there is no finish line. Read more...