Homemade Liquid Castile Soap

I adore Castile soap. Truly. I use it everyday of my life in some way, shape or form. We use it in homemade cleaning products and homemade beauty products that we use everyday. My homemade coconut shampoo, homemade shave cream, homemade body wash and more use it. What I really don’t like about it is the cost though. Buying liquid Castile soap can get really expensive, really quickly! Buying it can run you $15 or more for a 32 oz bottle which means that an otherwise budget friendly DIY suddenly becomes not quite so budget friendly. The solution? I make my own homemade liquid Castile soap for right around $5.00 for 96 oz!

Castile soap can be so expensive, but I've found a FANTASTIC money saving hack for saving on it! How? I make it homemade! This homemade Castile soap recipe makes a liquid soap that is just as high qualuty as the super expensive stuff for pennies on the dollar!


It might seem complicated, but making your own homemade Castile soap isn’t hard at all. We use it so much that I generally end up doing one batch every week or so. It’s incredibly easy to make, but it’s also very budget friendly when you compare it to the other stuff. I buy all of my supplies on ePantry where I pick up the bars of Castile soap needed for only $4.69 each. Amazon is also great for finding a deal on the bar version. The only other true cost I have is the water used and the power used. Since it doesn’t take much of either, the cost breaks down to around $5.00 per batch. At 96 ounces, that comes out to just $0.05 per ounce compared to an average of $0.50 per ounce for commercially made Castile soap.

When you make this version, you’ll use it in your products just like you do the store bought stuff. It’s not quite as thick as the other stuff though so just keep that in mind. It shouldn’t affect your recipes at all. I also use it to make my homemade hand soap, my homemade dishwasher detergent, and my homemade floor cleaner. It has so many uses so having the homemade version on hand really makes it worth it for me. I usually make unscented, however, if you’re looking to replicate something like Dr. Bronners Peppermint Castile soap, you can add any essential oils that you would like.

Homemade Liquid Castile Soap

When you first make this recipe, you’ll have to figure out how thick you want your homemade Castile soap to be. When I first started making it, I only used 4 cups of water, but I found that it was too thick for what I needed it for. At 12 cups, it’s watery but works for what I need. As you make it more and more, you’ll find that happy spot where it’s just perfect for you and your family. Most of the time, I use around 8 or 9 cups and it’s just right for making my cleaning products and things like that.


You will need:


If you want to make this easier on your hands, cut your bar of Castile soap in half with a sharp knife. It is easier to manage the bar when it’s smaller so that things turn out the way you want them to.


Grate the entire bar of Castile soap. If you end up with a big-ish chunk of soap left over, like I often do, you can either save it to melt down into a new full sized bar or you can cut it up into much smaller pieces with a very sharp knife. For those that don’t want to spend their time grating the soap, you can cut it up into smaller chunks and tun it through a small food processor. Just be sure that you only use the processor you use for soap making and things since it will likely end up gunky.


Once you’ve got all of the bar soap grated, add it to a mixing bowl, bucket or if you’re heating your water on the stove, your pot.


Stir it well until the soap shreds melt. If you water cools, you may need to re-heat the water. If you’re using essential oils to give your Castile soap scent, wait until it’s almost cool but still able to be stirred. Add a few drops of the oil you’re using and stir again. Alternatively, you can let it cool some, pour into a mason jar, add the oils and lid and shake till your heart is content!


Seriously ya’ll. That’s all there is to it!

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Stacy Barr
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Stacy Barr

Stacy Barr is the face and brain behind the frugal living and lifestyle blog Six Dollar Family . By the age of 30, she had overcome an alcohol addiction, a drug addiction, divorce, survived domestic violence and had built a life for herself and her daughter after spending 10 months in a homeless shelter. Her book, also called Six Dollar Family, has sold more than 7,000 copies since its release.

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  1. MichalMichiels says:

    Can you use this liquid castille soap for your laundry detergent recipe? Or Castille bar soap?

  2. When you say “one bar,” do you mean 4 oz? Thanks!

  3. When making dishwasher detergent, when do I add the Castile soap?

  4. I have only 6 cups of water, and have already used two bars of soap, but it’s still really watery. What am I doing wrong?

    • Tiffany, pour off some of the water (into a bowl so that you don’t waste the soap that is in it) and let the rest come to a simmer over medium/low heat. Simmer until the water and soap combine then try adding the rest of the water and heating until it combines. I’ve never had to do it that way personally, but I have a close friend who needs to every time.

    • Thank you Stacy. I tried this and came up with the same result. But I realize that maybe my question wasn’t clear enough.
      I suppose that my expected result would be something similarly as thick as the hand soap from the grocery store (not exactly, but close). But I am thinking now that something else must be thickening that soap up. Maybe a chemical?
      The soap is fine, it’s just really watery. I had made your shampoo recipe, and even with the added oils (of course I know that water and oil don’t mix) it was just like pouring water on my hair, and it was difficult to lather in. I thought maybe because the soap was too thin.

      • Tiffany, you can make a salt/water solution to thicken them if you’re not happy with the consistency. Mix 1/2 oz of regular table salt to 1 1/2 oz of water and stir until the salt is fully dissolved. Add it to your finished product in very small amounts until you get the consistency that you’re looking for. It usually doesn’t take over a ML or two to get it to thicken up. It will work for any of our recipes, hand soaps and shampoo included. 🙂

  5. Why is my soap so thick with a weird slimy consistency? I used 1 bar of Dr. Brominers to 9 cups of purified water heated on the stove. I let it cool and then the next day it was almost solid with a slimy consistency after I stirred it. This is my 2nd attempt. (Love the laundry detergent by the way) I plan on trying most of your recipes.

    • I’ve never had that happen. Try putting it back on the stove and adding 2-3 more cups of water. Because stoves heat at different temps, some folks will need more water than others.

  6. Jenny Fortgens says:

    Thank you for your recipe, it is awesome! I did had to add more water to it, for the same reason as Stacy

  7. Just bought the Kirk’s castile 4 oz bars for a much lower price from Walmart. I had to buy it online and pay shipping but it was still cheaper than any other place online, including Amazon. Can’t wait to try this recipe.

    • Thanks for letting us know! I link to them so that folks who can’t find it in store can still pick it up. 🙂 Glad to know that Kirk’s is cheaper. I’ve never tried it though. Let us know how it goes!

  8. Susan Rutledge says:

    So when you store the soap in a mason jar, does it solidify again after it cools down?

    • Stacy Barr says:

      Susan, it can, but doesn’t always. If it happens to, simply add it back to the pot and add a bit more water. It’s different each time I make it so I really have no idea what will make one batch gel and another not gel.

  9. A tip for anyone grating soap: I invested in one of those hand crank graters (I think it’s IKEA brand, but I bought it on Amazon for around $10). No accidentally grating your fingers or having to deal with those tiny ends of bars! I keep it stashed with my other laundry detergent ingredients, so we don’t use it on food.

  10. Priscilia says:

    Can I use any soap bar here?

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