Having a stainless steel or plastic water bottle in your daily use items is important. It helps you stay hydrated all the time. 

Before you place that order for your favorite, check the capacity. Find out whether it will meet your daily hydration needs. 

Health experts say that you should drink six glasses of water at the very minimum. These are 8-ounce glasses. 

On the higher side, you can drink up to eight glasses. Therefore, once you know the ounces that a water bottle can hold, you will find out whether it is enough for the day. 

You have probably ordered a water bottle from a company whose motto is “be vital” and wondered what the hullabaloo was all about, when it comes to drinking water. It is because water is life and it is very vital to your health. 

But first, are you even drinking enough of this universal drink? Check the size of your water bottle. It should tell you!

The most common water bottle sizes

The water bottles available in the market vary widely. Their sizes start at small, to extra large, 1-gallon bottles that you cannot carry on your person. 

There are small 8-ounce bottles. These are for a single serving, one glass. This would be perfect for a child but still it won’t meet his or her daily hydration needs. 

The medium-sized bottle has a 16.9 ounces capacity. This is considered a universal size. Everyone carries this water bottle to work, school or to the outdoors because it is just the perfect size. 

16 ounces is equivalent to two glasses of water so that is about two servings of water. Still, even this one is not going to help you meet your daily hydration needs

The 24-ounce size bottle is also common. This bottle would give you three glasses or three servings.

The fourth bottle in this list of common sizes is 32 ounces. This bottle gives you 4 servings or 4 glasses of water. To meet your daily hydration needs, you would need to drink two such bottles of water. 

The standard water bottle size

Sometimes, you just don’t want to go through all the trouble of checking the sizes of the water bottles before ordering a few for your family. 

In that case, order the water bottles knowing that the commonly used sizes are 16.9 ounces. This is the standard size of a bottle. To get any other size, that is, small (8 ounces), extra large (24 ounces), or extra large (32 ounces). 

If you are used to measuring your liquids in ML – milliliters, you can convert the ounces to ML online. 


  • The 8-ounce bottle holds 237ML
  • A 16-ounce bottle is equal to 473ML
  • A 24-ounce bottle is equal to 710ML
  • A 32-ounce bottle is equal to 946ML

Hopefully, this gives you a clearer picture of the amount of water you will be carrying for your daily consumption, depending on the bottle you will choose. 

The daily carry bottle is a 16 or 24-ounce one. The 32-ounce bottle is good for keeping in the car during road trips, or for packing in your backpack when hiking. 

How to measure how many ounces a bottle holds

Water bottles are marked with a scale (in ounces). But if the bottle you have bought does not have this scale and it does not have a label, you can still measure it at home to know the capacity. 

The water glass that you use at home is approximately 8 ounces. Fill your bottle with water, and then pour it into the glass. If it fills one glass only, that is a small, 8-ounce bottle. 

If the water fills two glasses with a little amount of water to spare, it is a 16.9-ounce bottle – medium size.  

A 24-ounce bottle is going to yield 3 glasses of water. 4 glasses with little water to spare means it is a 33.3-ounce bottle. 

You could also measure the weight of the water on a scale, in grams or kilograms. 1 fluid ounce is 28.3 grams. 

If the water weighs 227 grams, the bottle capacity is 8 ounces. For 470 grams, the size of the bottle’s capacity is 16.9 ounces. 680 grams is for the 24-ounce bottle while 944 grams is 33.3 ounces. 

There are many online calculators to convert oz to g, and other units as well. 

Other water bottle sizes

While the 8, 16.9, 24, and 33.3-ounce sizes are the most common, they are not the only ones. , There are a few more sizes.  

You can order the 40 Oz, 64 Oz and 128 Oz water bottles. These are large. The 40-ounce one would be good for someone who needs to consume a lot of water in a few hours for their health

The 64 and 128-ounce ones are too large to carry even in your backpack. The latter would be perfect for your RV. 


The size of the regular water bottle is 16.9 Oz. This is the accepted industry standard. Usually, any water bottle should come with a label denoting its size properly. 

If yours doesn’t have this, measure the number of 8-ounce glasses of water it can hold. You can also measure the weight of the water on a scale and then convert the grams to ounces.