How Much Ounces of Water Should You Drink a Day

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You’ve heard it a million times: “Drink eight 8-ounce glasses a day!” That’s 64 ounces, or about half a gallon. Spoiler alert: that number came from a random recommendation in the 1940s, not from some hydration scientist in a lab coat. It’s not a one-size-fits-all magic number.

Think of it like a pair of jeans. Your size isn’t the same as your friend’s size, right? Same goes for water. If you’re a 150-pound couch potato, you need less than a 200-pound marathon runner who’s sweating like a sprinkler. So let’s personalize this party.

Your Body’s Sneaky Water Calculator

Here’s the real math, and I promise it’s easier than tax season. A common guideline from doctors is: Take your body weight in pounds, divide it in half, and drink that many ounces daily. So, if you weigh 160 pounds, you’re aiming for about 80 ounces. That’s like a big Nalgene bottle and a half. Easy peasy.

But wait—there’s a catch (there’s always a catch, right?). If you exercise, add another 8 to 12 ounces for every 30 minutes of workout. If it’s hotter than a jalapeño outside, add more. And if you’re pregnant or breastfeeding? Your body is basically a water park, so aim for closer to 100 ounces. Your mileage may vary, literally.