Staying hydrated is essential for your physical and mental wellbeing. Knowing how much water you need to drink each day is key, but how many ounces are in a bottle of water?

Whether you’re in the process of setting up a water-drinking goal or trying to figure out how much water you’ve already consumed, having an understanding of how many ounces of water are in a bottle of water can be helpful. To help you get started, we’ve put together a guide with some of the most common bottled-water container sizes, and the amount of ounces they hold.

• 8 oz Bottle

  Those small, single-serving containers commonly found in convenience stores are 8-ounce bottles of water. They are about a single cup of water.

• 16.9 oz Bottle

  The 16.9 ounce bottle size is likely the most widespread, ubiquitous size of bottled-water containers. It’s the standard size of bottled water that you’d find in the refrigerated section of convenience stores

• 1 L (33.81 oz) Bottle

  This size is usually found in pack sizes at the grocery store, and it’s a little more than 4 cups of water. It’s perfect for those with an active lifestyle who want a convenient way to stay hydrated.

• 1.5 L (50.72 oz) Bottle

  This is the largest common size of bottled water, and one of these bottles will contain a little more than 6 cups of water. Perfect for getting a lot of hydration in a single container.

Now that you know some of the common sizes of bottled-water containers, and how many ounces are in each one, you can use it to help you achieve your hydration goals. Whether you’re trying to drink more water each day, or just tracking the amount you’re drinking, understanding the amount of ounces in each bottle or container can be a helpful tool.