PHILADELPHIA (CBS) — Plan on indulging in a cocktail or two over the holiday weekend? Depending on how it is made, it may contain much more alcohol than you think.

The National Institutes of Health is offering a solution. It has an online calculator to measure how much alcohol really is in that margarita you may be sipping on.

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According to the NIH, a normal drink is the amount of alcohol in a 12 ounce beer or 5 ounces of wine. However, with cocktails and mixed drinks, the use of multiple ingredients make it more difficult to get an exact measure.

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So, if you’re looking to check how much alcohol is in your favorite drink, simply type it in here.

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