Wholesale Stainless Steel Water Bottles & Tumblers

wholesale insulated water bottle

Premium Quality, Stylish, Food Grade & BPA Free. Ideal for corporation gift, promotional gift and event gift.


Want to Buy Custom Corporate Gifts?

How Many Ounces In A Water Bottle?

How Many Ounces In A Water Bottle

Many people have no idea about how much water exactly they should take for a day. And the volume units for water bottles differ from countries or brands. Here “ml” is adopted by A but there “ounce” is used by B. These volume unit dazzle you every day. You must have heard something like this – drinking 8 bottles of water per day is good to your health. But bottle sizes vary from each other. Drinking 8 bottles of 500 ml is totally different from 8 bottles of 1000 ml.

But many people only know how many cups/bottles they need to drink a day, lacking of a clear understanding of the volume unit like oz, ounce or liter ( most commonly used for water container). And the volume of cups or bottles differ from each other on the market. Therefore, to ensure you take proper amount of water per day, this article will take you to explore how many ounces exactly in a water bottle.

1. How many water should you take per day?

Water is crucial for human health, as it plays a vital role in many bodily functions. Proper hydration is necessary for the body to function optimally, and a lack of water can lead to symptoms such as fatigue, headaches, and dizziness. What’s more, water helps keep the skin healthy and hydrated, which is important for maintaining a youthful appearance.

Reading here, some people would believe that they will be very young and healthy if they drink water as much as possible. If you have the same thoughts, all of you couldn’t be more wrong! Excessive water intake can lead to a condition called hyponatremia as well as an overburden to your livers.

According to the U.S. National Academies of Sciences, Engineering, and Medicine, 125 ounces of water is adequate for men per day and 91 ounces for women per day. But for more precise intake of water, you can calculate based on your actual weight. Look at the following picture:

How many water should you take per day

So it’s best to listen to your body and drink enough water to stay properly hydrated, without going overboard.

2. What is liter, gallon and ounce?

At first, you need to know what the volume units like liter, ounce or gallon are for water. To give you a clear sight, this part will use gram as the basic unit for conversion.

Liter (L): The liter is the standard unit of volume in the International System of Units (SI). 1 liter is equal to 1,000 cubic centimeters (cc) or milliliters (ml). 1 liter of water has a mass of 1 kilogram, or 1,000 grams. So, for example, if you have a container that holds 2 liters of water, then the mass of water in the container would be 2 kilograms, or 2,000 grams.


Gallon (gal): The gallon is a unit of volume commonly used in the United States and some other countries. One US gallon is equal to 3.785 liters, while 1 imperial gallon (used in the UK and Canada) is equal to 4.546 liters. And 1 gallon of water is equal to approximately 3785.41 grams.


Fluid ounce (fl oz): The fluid ounce is a unit of volume commonly used for measuring liquids in U.S and U.K. For the British fluid ounce, 1 fluid ounce of water is equal to approximately 28.34 grams. For the U.S fluid ounce, 1 fluid ounce of water is equal to approximately 29.57 grams.


Here let’s calculate how much water should we drink in different volume units. A healthy man needs to drink 125 ounces/ 3.7 liters/ 1 gallon of water and a healthy woman needs to drink 91 ounces/ 0.7 gallon/ 2.7 liters of water.

3. How many fluid ounces are in a water bottle?

There are different sizes of water bottles on the market, from 250 ml to 2000 ml. The bottled water that are seen everywhere on the market is a standard container for water, which is about 500 ml per bottle. Based on the previous introduction to volume units, we can get 500ml (0.5L) equals to 500 grams and 1 ounce equals to 28.345 grams (British standard). After conversion, 500 ml equals to 17.63 ounces (oz).

And in this part, we’d like to take several hot-sale water bottles of famous brands as examples. Let’s take looks at how many ounces are in these wholesale water bottles based on British standard.

Yeti 30 oz tumbler

This YETI vacuum insulated tumbler sells best on Amazon, which is of 30 ounces (850 ml after conversion). If we follow the U.S standard, it means that he needs to take at least 4 bottles of water with this 30 oz YETI tumbler per day.

Hydro Flask 40 oz Water Bottle

This wide mouth bottle with flex cap is from Hydro Flask. It is of 40 ounces(1133.8ml after conversion), with which 3.125 bottles of water is adequate for a healthy man.

S'well 17 oz Water Bottle

This insulated water bottle attracts many young customers due to its beautiful design. But it’s only 17 ounces (481.865 ml). If you are a man, you need to drink 7.35 bottles with it and woman drink 5.35 bottles.

Hydro Cell 24 oz Water Bottle

The 24 oz (680.28 ml) insulated vacuum water bottle is a hot product in Hydro Cell. Buying it means that a man should drink 5.20 bottles of water and a woman should drink 3.79 bottles.

Chilly’s 500 ml Water Bottle

Chilly’s products are famous for its stylish designs. This bottle is of 500 ml that is equal to 16.9 ounces(oz) after conversion. Just like the 17 oz S’well Water Bottle we mentioned above, 7.39 bottles of water for man and 5.39 bottles for woman is enough.

Stanley 40 oz Tumbler


It is important to stay properly hydrated by drinking an adequate amount of water every day. The volume units used for measuring water can be confusing, especially when it comes to water bottles, which come in various sizes and units such as liters, gallons, and ounces. By understanding the conversion between different volume units, we can better estimate how much water we need to drink each day and how many water bottles we should consume. By give water bottles from different brands, we hope this article could be helpful to you. Always listen to your body and drink enough water to stay hydrated, without overdoing it. If you want more information, please contact us!

Shopping Cart