The official science-y answer is about 2.7 liters (11.5 cups) for women, and 3.7 liters (15.5 cups) for men per day. That’s from the National Academies of Sciences, Engineering, and Medicine.
But wait—before you start measuring your life in water bottles, here’s the twist: that total includes all fluids. Yes, your coffee counts. Your soup counts. Even that juicy watermelon you had for lunch is pulling its weight.
So don’t panic if you’re not mainlining a gallon of tap water. You’re probably closer to the goal than you think—and your kidneys are giving you a slow clap right now.
Does “8 Glasses” Hold Water?
You’ve heard the “eight 8-ounce glasses a day” rule a million times. It’s catchy, easy to remember, and honestly? It’s not terrible advice—especially if you’re a normal human who likes round numbers.
That equals about 1.9 liters. It’s a little low for most people, but it’s a fantastic baseline. Think of it as the “get off the couch and drink” minimum.
If you do that and still feel like a dried-out sponge, just add another glass. Your pee will thank you (and it should be pale yellow, not dark amber—unless you’re into fossil fuels).
