Halloween is fast approaching, which means time to plan your costume and stock up on candy for trick-or-treaters.

Halloween-related household spending is expected to hit a record $13.1 billion dollars, with $3.9 billion of that spent just on candy, according to the National Retail Federation.

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Figuring out exactly how much candy to buy can be tricky. You don't want to face disappointed trick-or-treaters if you run out, but also want to avoid piles of leftover fun-size chocolate bars.

The good news is there's a way to calculate the right amount of treats you need to purchase based on a few factors.

Omni Calculator has an easy tool that helps estimate the number of candy pieces needed based on the approximate numb

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