how long does 8.5 oz shampoo last

How Long Does 8.5 Oz Shampoo Last?

How long does 8.5 oz shampoo last? If you’re using only a dime size amount during each wash, an 8.5 oz could last a while. You can expect a shampoo bottle of this size to last a month with daily washing.

The time a shampoo (or conditioner) lasts depends mainly on your hair wash habits. Naturally, an 8.5 oz of shampoo will go faster with daily washes than washes only 2-3 times a week. Yep: that is just how the cookie crumbles. 

In this article, we’ll be reviewing which shampoo sizes can go the distance. Just how many washes you can get out of a bottle of shampoo matters, after all.

How Long Does 8.5 Oz Shampoo Last?

An 8.5 oz shampoo lasts a month if you’re washing your hair daily. Daily hair wash habits tend to wear down the product faster than washing every other day. Otherwise, you can certainly extend the life of your 8.5 oz shampoo.

Although a bottle of 8.5 oz shampoo only lasts a month—30-ish days—it can last longer. The life of a shampoo bottle rests on the frequency of hair washing; not the size of the bottle used.

Therefore, only washing your hair 2-3 times a week (or less, we won’t judge) is a game changer. What was originally a single month with daily washing can be extended out to 3 months. 

This is not to say you should wash your hair less frequently. If you know your hair type, then you likely already have wash cycles down-pat. No matter what, you should always do what works for you and your hair. 

How Long Does 3 Oz Shampoo Last?

Ah, travel shampoos: we love them. But, how long do these sweet little bottles last? As it turns out, 3 oz shampoos don’t last very long. You can expect 3 oz travel shampoos to last a maximum of 6-8 days with daily washes.

A week of fresh hair is what you get with a 3 oz shampoo. As we previously mentioned, the less you wash your hair, the slower the shampoo will go. By washing your hair less frequently, the life of a 3 oz shampoo can be extended significantly. Again, however, infrequent washes aren’t for everyone. 

If you are taking a long trip and are worried about running out of shampoo, getting extra never hurt anybody. It is better to have too much than to be stuck with too little. Also, having greasy hair out on the trip with no dry shampoo is no fun. Luckily, dry shampoos come in 3 oz travel sizes too!

How Long Does A 12 Oz Bottle Of Shampoo Last?

A 12 oz bottle of shampoo lasts 4 months. A dime-sized amount of shampoo combined with daily washes means that 12 oz shampoo lasts at least 4 months. Using more during washes—or washing your hair every other day—changes this estimation.

With less frequent washes, a 12 oz bottle of shampoo could last a good 6 months, if not more. It all depends on what habits are being used when hair washing. Using a generous amount with infrequent washes can swiftly empty a 12 oz shampoo in 4 months flat.

How Many Washes Do You Get Out Of A Bottle Of Shampoo?

The amount of washes you get out of your bottle of shampoo depends on several factors. These factors include (but are not limited to):

  • Hair length
  • Hair type
  • Lifestyle
  • Porosity
  • Wash routine
  • Size of shampoo

While things like hair length, type, and your wash routine may be given, there are more things to consider. For example, the size of the shampoo can make or break the number of washes you can get out of it.

Smaller bottles will naturally hold less product; bigger bottles hold substantially more. Additionally, your hair porosity determines how much moisture your hair can retain and whether or not it is dry or oily. Now, you may be wondering where lifestyle fits into this.

Here is how it goes: the more often you sweat, the more often you will need to wash your hair. This means any physical activity, no matter how strenuous, can lead to an impromptu hair wash.

Likewise, the weather can affect the frequency with which you sweat and the overall health of your scalp. Generally speaking, it isn’t easy to determine how many washes are in a single bottle of shampoo since there is no uniform size.

Furthermore, there is no single “right” way to wash hair. The amount of washes that can be had from a bottle of shampoo is severely limited by the quantity of shampoo used during washes.

Final Thoughts: How Long Does 8.5 Oz Shampoo Last?

When we get down to it, there are a lot of different-sized shampoos on the market. It can be overwhelming to figure out which size is right for you and your circumstances. 

Generally, a 12 oz bottle of shampoo is the best choice out of the three sizes we covered. It lasts the longest while affording you more freedom: there is no worrying about running out of shampoo come next month.

Thus, 12 oz shampoo is more cost-efficient and sustainable. If financially able, there is no buying multiple, unnecessary smaller bottles: you can just purchase a larger one. Less plastic is always a good thing. 

What the lifespan of each size bottle comes down to is the flexibility—or lack thereof—in your hair care routine. While bigger is always better, some folk can really squeeze out all they can from smaller bottles. 

It is crucial to keep in mind that shampoo is for the health of your scalp. Hair that is greasy, oily, or flaky can cause scalp buildup. With buildup, one can experience dandruff and acne along the hairline or scalp itself. It is itchy, uncomfortable, and all around a bad time.

Those with hair prone to oil will need to wash their hair more often to avoid scalp buildup. That being said, you should not break your hair-washing habits for the sake of saving some shampoo.

Buy bigger, if you can, and keep whatever routine works for you. If you enjoyed reading this article, check out the next article in the series: “How Much Does A Bottle Of Shampoo Weigh?