Soap Making for Beginners: Building Your First Recipe
This is the part that feels intimidating at first, but once you understand a few simple principles, you’ll be able to create balanced, reliable bars every time (without guessing or copying someone else’s formula).
Let’s break it down in a way that actually makes sense.
Step 1: Understand What Makes a “Good” Bar of Soap
A well-balanced bar of soap isn’t about using the most expensive oils—it’s about balance.
You’re aiming for a bar that:
- Hardens well
- Lasts in the shower
- Produces a nice lather (bubbles + creaminess)
- Feels good on the skin
Every oil contributes something different, so your job is to combine them in a way that checks all those boxes.
Step 2: Start with a Simple Base Formula
Instead of starting with a complicated recipe, start simple and adjust one thing at a time. It's easy to shift these percentages around a little to make your amounts easier to measure. Also, starting your recipe with percentages makes it easy to scale to fit your mold.
Beginner-friendly formula:
- 40% Olive Oil
- 25% Coconut Oil
- 25% Tallow or Palm Oil
- 10% Castor Oil
This works because:
- Olive oil = conditioning
- Coconut oil = cleansing + bubbles
- Tallow/palm = hardness + longevity
- Castor oil = boosts lather
This combination hits all the major fatty acid categories without needing 10 different oils.
Step 3: Choose Your Total Batch Size
Pick a batch size that feels manageable, but remember the smaller your batch is, the easier it is to make larger measuring mistakes. Most scales are limited in how precise they can be so making very small batches is more difficult than making a 1 or 2 pound batch.
- 500g (1.1 lb) oils → small test batch
- 1000g (2.2 lb) oils → standard beginner batch
Working in grams is more accurate and easier when using a lye calculator, but ounces may be easier depending on the size of your recipe. Also, base your batch size on the size of your mold. Most soapmaking molds will tell you how many ounces they will hold, but if not, then use the following formula to calculate.
For rectangular molds, measure L x W x D in inches and multiply by .4 to find the required ounces of oil. This calculation is based on using the full water amount for your recipe so if you decide to use a water discount, it won't be quite as accurate for you, but it will give you a good starting point.
Step 4: Calculate Your Lye and Water
Once you’ve chosen your oils and percentages:
- Convert percentages into weights
- Run your recipe through a lye calculator
- Choose a superfat (lye discount) of 5–7%
Example (1000g batch):
- Olive oil (40%) = 400g
- Coconut oil (25%) = 250g
- Tallow (25%) = 250g
- Castor oil (10%) = 100g
Then plug those numbers into a calculator to get:
- Lye amount
- Water amount
Always double-check your numbers—this is the most important step.
Step 5: Adjust Based on What You Want
Once you’ve made a basic batch, you can start tweaking.
Want to customize your soap? Here’s how:
- More bubbles: Increase coconut oil slightly (but keep under ~30%)
- More conditioning: Increase olive or avocado oil
- Harder bar: Add more tallow, palm, or a butter
- Better lather: Keep castor oil around 5–10%
Small changes make a big difference—adjust slowly and test.
Step 6: Keep Notes (Seriously, Do This)
This is what separates frustrated beginners from confident soap makers.
Write down:
- Exact recipe percentages
- Additives (fragrance, colorants)
- How it behaved (trace speed, hardness, lather)
You will not remember later. Ask me how I know.
Common Beginner Mistakes to Avoid
- Using too many oils at once
- Skipping the lye calculator
- Using too much coconut oil (drying)
- Not letting soap cure long enough (4–6 weeks matters)
Keep it simple. Simple recipes are easier to troubleshoot and improve.
Tools That Make This Easier (Beginner Must-Haves)
If you’re just getting started, a few tools make a big difference:
- Digital scale (non-negotiable for accuracy)
- Stick blender (faster trace, smoother batter)
- Silicone mold
- Lye calculator (always use one)
These are also great places to add affiliate links if you’re building out your blog.
Final Thoughts
Your first soap recipe doesn’t need to be perfect—it just needs to be balanced and safe.
Start with a simple formula, make small adjustments, and pay attention to how each batch turns out. That’s how you learn what each oil really does and how to build recipes that fit your style.
The goal isn’t to memorize recipes—it’s to understand how to create your own.