Culver's crafts its milkshakes with its signature frozen custard that's made in-house. The Wisconsin-born restaurant chain lets you choose from various flavors and toppings, but the peanut butter shake is the most caloric.
Denny's famous Grand Slam breakfast may go well with a milkshake, but you're way better off skipping the sugary dairy drink at the diner-style chain.
Known for its famous Blizzards, Dairy Queen is basically restaurant royalty when it comes to ice cream treats. DQ's Hot Fudge Shake is blended with hot fudge, milk, and soft-serve for an especially delicious but also majorly caloric milkshake.
If you're visiting the drive-in chain, skip Sonic's Oreo Cheesecake Shake, which is blended with vanilla soft serve, cheesecake, graham cracker crumbs, and Oreo pieces.
But it's not like the other flavors are any better: A Salted Caramel shake will run you 840 calories and 96 grams of sugar, while a Vanilla Shake gives you 680 calories and 71 grams of sugar.
The International House of Pancakes is known for its carb-filled fare, but the restaurant chain's milkshakes are on another level.
Cold Stone's Reese's Chocolate Peanut Butter Dream Shake tops the list at 1,780 calories—almost a full day's worth of calories for many adults.