Strategy: The number 37 reveals everything you need to know about getting a deal on Black Friday

On Black Friday, remembering the number 37 will help you be sure that you're getting a good deal.

• To get a good deal on Black Friday, make sure the item is discounted by at least 37%.
• WalletHub.com calculated this number based on an average of discounts it evaluated for its Black Friday report.
• It might still be worth buying an item if it rarely goes on sale or is otherwise hard to find.

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Almost every retailer offers big discounts on Black Friday. But how can you be sure that that discount isn't just a bait and switch?

This year, the most important number in Black Friday shopping is 37%.

That's the threshold for a good deal, according to analysis by the personal finance website WalletHub, which took an average of all the discounts being offered by the 35 largest retailers participating in Black Friday.

Some retailers offer doorbuster discounts in limited quantities to lure customers into the store, but then only offer small discounts on other merchandise. Sticking to the 37% discount figure, which can easily be calculated on the fly, will ensure you won't be tricked by misleading Black Friday deals.

This number isn't universal, though. The 37% figure is an average of all categories, but some categories, like appliances or computers, typically offer a smaller discount. And, if you're looking for an item that rarely goes on sale or is hard to find, it might still be worth snagging the Black Friday discount even if it's less than 37%.

Still, it's a good rule of thumb to remember as you shop online or roam the aisles on November 24.

On Black Friday, remembering the number 37 will help you be sure that you're getting a good deal. Read Full Story