Sizu Riatto
Vegan Soap & Candle Math · Chapter 5

Oil Blend Designer

A blend's qualities are weighted averages of its oils. The ranges are guides, not laws: castile breaks them and still works.

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Opens on the book's Market Batch with the SoapCalc profiles Chapter 5 cites. Change the percents, or type another oil's profile from your supplier or SoapCalc.

Each oil: % of the oils and its fatty-acid profile, eight figures in this order: lauric myristic palmitic stearic ricinoleic oleic linoleic linolenic. Prefilled with the SoapCalc profiles the book cites (Chapter 5); type your oil's.

Enter the blend and press Calculate.

The formula

  • Hardness = lauric + myristic + palmitic + stearic; cleansing = lauric + myristic
  • Conditioning = oleic + linoleic + linolenic + ricinoleic; bubbly = lauric + myristic + ricinoleic; creamy = palmitic + stearic + ricinoleic
  • The blend's figure = Σ (each oil's share × its figure); iodine and INS the same way from each oil's own value
  • Linoleic + linolenic: a rule of thumb keeps it at or under about 15 % to slow rancidity
The book's worked example, Chapter 5. The Market Batch, 40 % olive, 25 % coconut, 20 % shea butter, 10 % high-oleic sunflower, 5 % castor: hardness 36, cleansing 17, conditioning 60, bubbly 21, creamy 24, iodine 61, INS 145; linoleic + linolenic 7.6 %. A 60/40 olive and coconut bar would be 42 hard but 27 cleansing, over the range.

Ranges are SoapCalc's suggested ranges: guides from experience, not tested limits. Profiles vary from batch to batch and supplier to supplier; your supplier's sheet beats any table. Prices are illustrative US supplier prices from October 2026, shown without a currency sign; put in your own. Everything stays in your browser: no sign-up, nothing stored.