The amount depends on the size of the soda:
Source:Soda calories can add up quickly! If you drink two – 20 oz. bottles of regular soda each day, by the end of the week you’ve consumed 3500-3850 calories of soda!
You may start to lose weight just by cutting out or cutting back on your soda consumption.

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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...