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Free Soap Making Calculator - Lye, Water & Recipe Properties

⚙️ Settings

5%
38%
0%
0% of oils

🫒 Oils & Butters

g✓ 100%
%500.0 g
%250.0 g
%200.0 g
%50.0 g
Total Oil Weight:1000.0 g

🧪 Additives

No additives yet. Click "+ Add" to include clay, sodium lactate, colorants, and more.

💡 Standard usage rate is 0.5 oz per pound of oils for fragrance oils, and 0.4-0.6 oz for essential oils. Some EOs like cinnamon and clove should be used at lower rates (0.2 oz) due to skin sensitivity.
oz/lb
Amount:31.3 g
% of oils:3.1%
g/kg:31 g/kg
⚠️ Always check individual fragrance/EO safety data sheets (SDS) for maximum usage rates. Some fragrances may accelerate trace or discolor. Essential oils vary in strength—start low and test.

📊 Recipe Results

Sodium Hydroxide (NaOH)
141.4 g
Distilled Water
380.0 g
Total Batch Weight
1521.4 g
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💰 Cost Calculator

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🎯 Bar Properties

Hardness
38
Cleansing
17
Conditioning
54
Bubbly
21
Creamy
26
Iodine Value60
INS Value151

↳ INS in ideal range (136-170). Recipe should trace and cure well. Target: 160.

Green zones on bars show recommended ranges (29-54 hardness, 12-22 cleansing, etc.)

⚖️ Sat : Unsat

38 : 58
SaturatedUnsaturated
lauric
12%
myristic
5%
palmitic
18%
stearic
3%
ricinoleic
5%
oleic
45%
linoleic
9%
linolenic
1%

A Free Soap Calculator and Lye Calculator

Soaply is a free soap calculator built around the proper lye concentration method. Enter the oils and butters in your recipe and it works out the exact sodium hydroxide (NaOH) or potassium hydroxide (KOH), the water, and your superfat, then predicts how the finished bar will perform.

Because every oil saponifies at a different rate, the right amount of lye depends entirely on your specific blend. That is why you should run your own oils through a lye calculator every time rather than reusing a number from another recipe. Soaply does the chemistry instantly and updates the moment you change an ingredient, so you can design a bar on purpose instead of by guesswork.

New to making soap from scratch? Start with our guide to using a soap calculator, then read up on lye concentration and the beginner's guide to cold process soap.

Soap Calculator FAQ

Is Soaply a free soap calculator?

Yes. Soaply is a free soap calculator. You can run any recipe and see the exact lye, water, and bar properties without creating an account.

What does the soap calculator work out?

Enter your oils and the calculator returns the exact lye (NaOH or KOH), the water amount from your chosen lye concentration, your superfat, and a prediction of how the bar will feel, including hardness, cleansing, conditioning, bubbly lather, and creaminess.

Does it work for bar soap and liquid soap?

Both. Choose NaOH (sodium hydroxide) for solid bar soap or KOH (potassium hydroxide) for liquid soap, and the calculator uses the right saponification math for each.

How accurate is the lye calculation?

The lye and water figures are precise, because they come from established saponification values for each oil. The bar-property scores are estimates meant for comparing recipes, since the finished bar also depends on cure time and your ingredients.

Can I resize a recipe to fit my mold?

Yes. Enter your oils as percentages and set the total oil weight to match your mold, and the calculator scales the lye, water, and everything else to suit.

Do I need an account to use the calculator?

No. Calculating is free and needs no sign-up. A free account lets you save recipes, and Soaply Pro adds cost calculations, a batch journal, custom oils, and PDF export.