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Calculate the percentage of carbohydrates in a sports drink.
Check the amount of carbohydrates on the nutrition label. Sports drinks do not usually label the percentage of carbohydrates in the drinks so you will need to calculate it for yourself.  Convert serving size from fluid ounces (oz) or mL to grams (g). For fluid oz, divide the amount of oz by 0.03527 to get the amount in g. To convert mL to g, divide the amount in mL by 1. Calculate the percentage of carbohydrates in a serving size by dividing the amount of carbohydrate in the drink by the serving size in grams and multiplying by 100.