How Long Do Shampoo Bars Last Compared to Liquid Shampoo?

Solid logic: less water means more washes.

That happens when you compare a solid shampoo bar to a regular liquid bottle. 

We all want clean hair. But we don't want to run out of shampoo too fast. It's a simple daily need that can get pricey over time. 

Now, you have 2 main choices here. The classic liquid shampoo in a plastic bottle. Or the newer solid shampoo bar. 

Both clean your hair well. They lather up and leave your hair fresh. But how long do they last? That’s where the differences start. 

In terms of that factor, it actually lies in the concentration and water content of each formula. And why should you know this difference? Because it directly affects your wallet and how often you need to restock.

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What Lasts Longer- Shampoo Bars Or Liquid Shampoo?

A shampoo bar lasts much longer than a bottle of liquid shampoo. 

We aren’t talking about a small difference. A bar can last up to 3 times longer than a standard bottle.

First, let's focus on the weight. 

A typical bar weighs 50 to 100 grams. Average that to 75 grams. Since 75 grams roughly equals 75mL of liquid shampoo, you can compare them directly. The difference is how slowly a bar gets used up.

Most shampoo bars deliver 60 to 80+ washes. For instance, our Naples Soap Shampoo Bars can last around 75 uses. 

That makes the solid shampoos super cost-effective. You use only what you need. And there’s no extra product pouring out.

Now compare that to liquid shampoo. 

As per this Reddit thread, a 3-ounce bottle gives around 10 to 12 washes for shoulder-length hair. That works out to about 5 washes per ounce. 

Since 1 ounce is 29.57 mL. That’s roughly 0.17 washes per mL. So, from 75 mL, you get about 12 to 13 washes.

The gap is clear. 

Because 75 mL of liquid shampoo gives about 13 washes, and a 75 g bar gives around 80 washes, divide 80 by 13. You get roughly 4 to 6 bottles replaced by a bar. 

Of course, it depends on several factors. 

• Hair Length
• Strand Thickness
• How much do you squeeze
• Whether you double-wash
• Water hardness
• How well you lather

How Do Shampoo Bars Last Longer Than Liquid Shampoo? 

Ingredient Formulations

Check the back of any liquid shampoo bottle. 

The first ingredient is almost always "Aqua" or water. It’s the main component. 

Liquid shampoos need water as a base to stay liquid. Without water, they'd be paste or solid. 

This is true for many brands, including our own Naples Soap Liquid Shampoo, which lists Aloe Vera and Water at the top. 

We add water because it's cheap and makes the product pourable. 

Now look at a shampoo bar. It’s a block of solid concentrates with oils, butters, and gentle cleansers. No water. 

Check our Naples Soap Company Shampoo Bar ingredients: Sodium Coco Sulfate, Cocoa Butter, Coconut Oil, and Red Raspberry Seed Oil. 

The Sodium Coco Sulfate cleans. The Cocoa Butter and Coconut Oil moisturize. The Red Raspberry Seed Oil feeds the scalp with vitamins. 

These ingredients are dense and potent. A few swipes on wet hair release their power instantly. You get full strength with every pass.

Controlled Usage

Sometimes, we use way more liquid shampoo than we need. 

When you squeeze a bottle, it's hard to control how much comes out. You squeeze, glop, and half of it ends up in your hands. Most of us use a quarter-sized amount when we only need a dime-sized amount.

With a shampoo bar, you control exactly how much product you use. You rub the bar directly on wet hair or lather it in your hands. 

The bar only releases what your hair needs. There's no excess pouring out.

Our Naples Soap shampoo bars last 50 to 75 washes because people naturally use the right amount. 

You can't accidentally dump half the bar down the drain. Rather, you appreciate every wash and don't waste a bit.

Waterless Stability

Water doesn't just dilute shampoo. It also creates problems. 

Most liquid shampoos are 70 to 80% water. This ingredient creates an environment where microbes can grow. To prevent that, liquid shampoos need preservatives. 

Take sodium benzoate and potassium sorbate, for instance. However, preservatives can break down over time. They can fail in a few weeks to a few years. That’s why liquid shampoos have a limited shelf life. 

A shampoo bar doesn’t have water. That makes it naturally stable. The solid format reduces the need for heavy preservation systems. 

Its ingredients stay intact in their dry state until they meet water during your shower. This stability helps the product maintain its quality over time. 

Our shampoo bars stay stable on the shelf for a long time. The Cocoa Butter and Coconut Oil in the ingredients act as natural preservatives. They also moisturize your hair. 

You get fresh product with every wash. Because the bar hasn't been sitting in water for months.

Less Waste 

As per a study on liquid shampoo waste, 

“Squeeze bottles leave behind up to 10% of the product”. It found that we throw the containers away, thinking they’re empty. But nearly a tenth of what we pay stays stuck inside. 

Turn a finished bottle upside down overnight. And you’ll probably get another use out of it. 

Shampoo bars eliminate this. 

When a bar gets small, you keep using it. Press the last sliver onto a fresh bar. There shouldn’t be any sticky residue stuck to the plastic walls. You actually use everything you bought. 

There’s a packaging factor, as well.

Liquid shampoo comes in plastic bottles that last for centuries. They’re not biodegradable. Even recycling takes energy and water. 

Shampoo bars use simple paper wrapping or cardboard packaging that breaks down naturally. For instance, Naples Soap solid shampoo uses paper bags. 

Less waste from the moment you open it until the last wash. 

Reduced Wash Frequency

Here's something people notice after switching to shampoo bars. Their hair doesn't get greasy as fast. So they wash less often.

Many liquid shampoos leave behind conditioning agents and silicones. These coat your hair to make it feel smooth right after washing. But over time, that coating builds up. Hair gets heavy and looks oily faster. You end up washing every day just to feel clean.

Shampoo bars take a different path. 

They use simple cleansers and natural conditioning agents that rinse clean. The cocoa butter and oils smooth your hair (minus the heavy coating). 

Studies show that shampoo bars use proper solid content levels that dissolve properly and wash out completely. So, it leaves no residue behind.

The scalp feels more balanced after switching. Hair stays fresh longer between washes. 

You go from daily washing to every other day, and your bar automatically lasts twice as long.

5 Hacks to Extend the Shelf Life of Shampoo Bars

Tip 1: Proper Drainage

The golden rule. 

A shampoo bar should never sit in water. Never leave it in a puddle on the side of the tub. If it sits in water, the bar will absorb that moisture. It turns into a soft, mushy paste. That paste will dissolve the next time water hits it.

Get a soap dish that drains. You need a dish with holes or slats. The water needs to drip off the bar and away from it. 

The bamboo dishes or simple wire racks work fine. If you want the best way to drain your bars, try our Lotus Flower Soap Saver. The tiny drain holes in it let the shampoo bars dry properly between uses. 

The goal is airflow underneath the bar. That way, the bar can dry out completely between showers.

Tip 2: Storage

Inside the shower is convenient. 

But that's also where humidity is highest. If your bathroom stays steamy long after showers, consider storing the bar outside the shower between uses.

Place your soap dish at the far end of the shower or tub. Put it where the spray doesn’t reach. 

If you have a small shower, get our hanging soap saver pouch. This lifts the bar into the air and lets it dry from all sides. 

Between washes, the bar needs to be in a dry place. Don’t put it away in a dark, damp cabinet while it’s still wet. 

Tip 3: Maintenance

Every few weeks, give your bar a break. 

Let it sit out of the bathroom completely for a day to really dry out. This resets the moisture level and hardens any soft spots that developed.

If you notice the bar getting a white film or looking weird, that's often hard water minerals or soap scum. 

You can rinse the bar under fresh water. Gently scrub it with a soft brush or your fingers. This removes the buildup and exposes the fresh bar underneath.

Some people rotate between 2 bars. Use one for a few days. Then let it dry completely while using the other. 

This extends the life of both bars because each one gets proper drying time between uses.

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Tip 4: Usage Technique

How do you use the bar? That makes a huge difference, too 

Don't rub the bar vigorously all over your head. That wastes product and puts too much shampoo in your hair. 

Rather, wet your hair completely. Then rub the bar between your hands to create a lather. Apply that lather to your scalp and hair.

Or you can swipe the bar lightly over your hair in a few sections. Then work up the lather with your fingers. 

Either method uses less product than rubbing the bar directly on your head.

For short hair, a few swipes are plenty. For long, thick hair, you may need more. But start small and add more if needed. 

Tip 5: Cutting/Portioning

Here's a trick that works great. 

Cut your shampoo bar in half before you start using it. Use one half while the other half stays fresh and dry in storage. This does 2 things.

First, you're only exposing half the bar to water at a time. The other half stays untouched and ready for later. 

Second, a smaller bar fits better in your hand and on your soap dish. You have more control. Plus, the bar dries faster as there's less mass holding moisture.

When the first half gets down to a small sliver, you can press it onto the fresh half. Keep using that until it's gone. 

5 Mistakes That Can Shorten The Life Of Shampoo Bars

3 Best Long-Lasting Shampoo Bars

1. Naples Soap Moroccan Oil Shampoo Bar

This bar is for anyone who wants a little luxury and a lot of shine. 

The key ingredient here is Argan Oil. It’s famous for taming frizz and adding a healthy glow to hair without making it heavy.

The scent is distinctive and sophisticated. It blends spicy amber and earthy musk with sweet florals. Smells exotic and alluring, like a high-end perfume. 

But the bar itself is simple at its core. It uses Sodium Coco Sulfate for gentle cleaning. The Cocoa Butter and Coconut Oil ensure your hair doesn’t dry out. 

This bar is perfect for dry, damaged, or color-treated hair that needs extra love. You can expect the full 50 to 75 washes from this bar.

2. Naples Soap Karma Shampoo Bar

The Karma Shampoo Bar is for the free spirits. 

Its scent is complex and hard to pin down. It combines citrusy oranges and neroli with earthy patchouli and woody pine. You’ll find it sweet, earthy, and unique.

The specialty is its inclusion of Charcoal. That’s a natural magnet for dirt and oil. It pulls impurities out of your hair and scalp. You get a deep clean. 

If you have an oily scalp or deal with product buildup, this bar is your best friend. 

The charcoal clarifies. There are Red Raspberry Seed Oil and Pro Vitamin B Complex, as well. They keep the hair strands healthy. 

It lasts just as long as the others. This makes those 75 washes feel like a spa day every time.

3. Naples Soap Stimulating Shampoo Bar

Need a wake-up call in the morning? This is the one.

The Stimulating Shampoo Bar uses Peppermint Essential Oil. It creates an invigorating, minty fresh scent. It’s herbal, cool, and refreshing. The bar can even wake up your senses and your scalp.

The peppermint oil does more than just smell good. It naturally helps stimulate blood flow to the scalp. Better circulation means a healthier environment for hair to grow. 

This bar is ideal for anyone with a dry or tired scalp. It cleans deeply with the same base of Sodium Coco Sulfate and moisturizing Cocoa Butter. So your hair ends up clean, fresh, and tingly. 

It’s a great unisex scent that feels clean. And yes, our 1.75 oz bar will sit in your shower and last through 50 to 75 washes. 

• Switch to our Naples Soap Shampoo Bars & Bottles today!

FAQs

Do shampoo bars last longer than liquid shampoo?

Yes, a solid bar typically lasts way longer. About 60 to 80 washes. That’s 4 to 6 times more than a standard 3-ounce bottle of liquid, which is only good for roughly 10 to 12 washes.

Are shampoo bars better for hair than liquid?

They can be. Since shampoo bars skip the water and heavy preservatives, you get concentrated, natural ingredients straight to your scalp. For instance, cocoa butter. There’s zero silicone buildup. This helps hair feel cleaner for longer.

How long does a 100g shampoo bar last?

You can expect a 100g bar to last anywhere from 80 to 100 washes. For most people with shoulder-length hair, washing every other day, that means a single bar will easily last 2 to 3 months.

What lasts longer, bar soap or liquid?

Bar soap wins every time. A standard bar of soap will outlast a pump bottle of body wash by at least 2 to 3 times. Because, like shampoo bars, it’s a solid concentrate with zero water diluting the formula.