How Many Cups are there in a Bottle of Water?

So many experts and health sites are publishing their recommendations for how much water we should be taking in each day. These recommendations are usually also measured in cups. Because of this, many people have found it quite challenging to determine just how much water they are getting in a day and whether or not they are actually getting enough to meet their daily needs.

Adding to the challenge is the fact that water bottles come in different sizes – plus the fact that it can be hard to determine or know for sure what the capacity of one “cup” is when it comes to these research results and advice.

Generally, health recommendations for cups of water needed per day are quite vague and unspecific when it comes to actual measurements. They are not in themselves very scientific, though they are based on scientific findings of the human body and what it needs.

Hence, with a little bit of research and mindfulness, we can use these recommendations as a guide when it comes to making sure we’re drinking enough water per day.

How Many Cups of Water Can Fill a Bottle?

How Many Cups of Water Can Fill a Bottle?

There are several factors that determine how many cups exactly are in a bottle of water. Two of the most important ones are cup size and water bottle size.

Also Read:- How Many Bottles Of Water Fill A Gallon

Cup Size

Generally speaking, when health experts refer to “cups of water,” they are referring to an eight-ounce glass. Keep this in mind as we discuss, and keep it in mind also every time you encounter recommendations of this nature.

Another popular, though some say a little outdated recommendation, is to take in eight glasses of water each day. If you go by that rule, then a great way to remember this is to think: 8×8. That is eight 8-ounce cups, which is equivalent to around 2 liters or half a gallon.

However, we are talking about water intake in terms of water bottle sizes. So let’s go right ahead and figure it all out!

Water Bottle Size

The second important factor that we have to remember when it comes to figuring out how many cups are in a water bottle is the size of the water bottle in question. There are many different sizes of water bottles available:

  • 16 ounces or 16.9 fl oz is the standard size
  • 20 ounces
  • 24 ounces
  • 32 ounces

Now, the number of cups of water you are drinking each time you empty out your water bottle depends on the actual size of the water bottle.


To find out how many cups of water are in a bottle of water, all you need to do is this:

Just divide the water bottle size by 8.

The equation would be:

(Water bottle size in ounces) / 8 ounces = the number of cups in that water bottle

Using this equation, the following applies:

  • A 16-ounce bottle contains about 2 cups of water
  • A 20-ounce bottle contains 2.5 cups of water
  • A 24-ounce water bottle contains 3 cups of water
  • A 32-ounce water bottle contains 4 cups of water

You can use the equation for other sizes of water bottles as well.

As you can see, there will be varying answers to the question of how many cups of water are in a water bottle.

Am I Emptying My Water Bottle Enough?

We can give you an idea about your water consumption by applying our conversion to the 8×8 method. After converting how many cups of water your water bottle can hold, you can then see how many times you need to refill and empty out your water bottle to at least hit the 8 glasses a day goal.

The basic equation would then be:

8 / [(Water bottle size in ounces) / 8 ounces] = number of water bottles you should empty in a day

Using that thought process, let’s examine some of the more common water bottle sizes:

  • 16-ounce water bottle = 2 cups
  • 8 / 2 = 4 16 ounce water bottles in a day
  • 20 ounce water bottle = 2.5 cups
  • 8 / 2.5 = 3 ¼ 20 ounce water bottles in a day
  • 24 ounce water bottle = 3 cups
  • 8 / 3 = 2.6 24 ounce water bottles in a day
  • 32 ounce water bottle = 4 cups
  • 8 / 4 = 2 32 ounce water bottles in a day

Also Read:- How Much Is 3 Liters Of Water In Ounces? Liter To Ounce Converter

Water Bottles And Cups

Before we get into how many cups are there in a bottle of water, we have to first establish the relationship between water bottles and cups to understand why the answer to the above question is important. Basically, it’s this simple:

  • A water bottle can hold a certain amount of water, depending on its size
  • This amount of water can be converted into cups
  • The recommended water intake is usually stated in cups

A great piece of advice that experts give for people to be able to take in more water daily is to always have a bottle of water at hand. A filled reusable water bottle always within reach ensures that you are able to drink whenever you feel thirsty. Water bottles are very practical too because you can take them wherever you go.

Whether you are in your bedroom, on the patio, in your car, for a grocery run, or doing a little shopping, toting a reusable water bottle with you that’s filled with water ensures that you sip more water throughout the day.

Having a cute water bottle to tote around can also make it more exciting to drink water. And refilling your water bottle can likewise be a fun task! Now, add in getting a better understanding of the number of cups of water needed to fill up your water bottle and keeping track of the amount of water you drink each day becomes a breeze.

The Importance Of Water

The Importance Of Water

Water is very beneficial to the body. This is why medical professionals agree that we should all drink enough water daily. They all encourage us to take in enough water every day to stay in peak health. The general recommendation from the medical field is:

  • 15.5 cups of water for males
  • 11.5 cups of water for females

However, keep in mind that this may still vary based on other factors like age, physical activities, environment, etc. But this is the general or average recommendation – and this is why a lot of people can’t help but ponder over how many cups are in a bottle of water. After all, knowing the answer to this question can help everyone track their water intake better.

Also Read:- How Many Bottles of Water Should I Drink A Day?

How many bottles of water are 8 cups a day?

The eight cups of water are equal to a 2-liter water bottle. According to the doctors, you should consume enough water, and it is better to constantly take a sip of water throughout the day, even when you are not thirsty.

How much water should I drink to lose weight?

It is essential for a human being to meet the water requirements of the body and hydrate the body. According to the expert, a person who wants to lose weight should drink around 1 to 2 liters of water per day. Excessive dehydration in one’s body can result in several other diseases.

Does drinking water reduce belly fat?

According to some researchers, drinking water helps reduce belly fat faster than a person who does not hydrate a body. We all know that a person should consume water even when they don’t feel thirsty.  2 liters of water is the minimum requirement for the body to maintain functioning.

Why do I pee so much when I drink water?

It’s because of the normal functioning of the urinary system. Whenever you drink more water, it flushes waste by-products and creates urine. It happens too often when you drink too much water, which the body does not require.


Now that you know how to compute the number of cups in a water bottle, you will be able to track your water intake better daily. Check the size of your water bottle, convert accordingly, and then drink the amount of water bottles needed per day to hit your water goals!