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WHEELING, IL - SEPTEMBER 19: Halloween candy is offered for sale at a Walgreens store on September 19, 2013 in Wheeling, Illinois. Walgreens, the nation's largest drugstore chain, has been expanding the merchandise offerings at many of their stores to include fresh food and grocery items. (Photo by Scott Olson/Getty Images)

The housing blog Apartment Therapy has come up with a formula on how much Halloween candy you should buy. The formula is as follows …

kids in your neighborhood

DIVIDED BY

servings in one bag of candy

MULTIPLIED BY

quality of decorations in the neighborhood on a scale of 1 to 5 + quality of the weather on a scale of 1 to 5

DIVIDED BY 2

equals bags of candy you need to buy

Now you know the formula, so try not to over buy this year!