Babassu oil in soap making
Published by The Soap Brain Team
Babassu oil is a cleansing soap-making oil rich in lauric acid (47%). A gram of it turns to soap with about 0.178 g of NaOH (lye). It gives a hard bar with a big, quick lather and is usually kept to a minority of the recipe. Most soapers use it at 15–30% of their oils.
Fatty-acid profile
Babassu oil is a strongly cleansing oil: its high lauric and myristic content produces a hard bar with a big, quick-rinsing lather. Most makers keep it a minority of the recipe (often under 30%) so the bar cleans well without stripping the skin.
Babassu oil is about 74% saturated fat and 15% unsaturated — that saturated majority is what lets it firm up a bar and hold a stable lather.
| Fatty acid | Share | What it does in soap |
|---|---|---|
| Lauric acid | 47% | a saturated fatty acid that gives a big, fluffy, fast-cleansing lather; drying to skin above roughly 30% of a recipe |
| Myristic acid | 15% | a hard, cleansing, bubbly saturated fatty acid that usually travels alongside lauric acid |
| Oleic acid | 13% | a monounsaturated fatty acid that makes a gentle, conditioning, moisturising bar with a slick, lower lather and a slower trace |
| Palmitic acid | 9% | a saturated fatty acid that builds a hard, long-lasting bar with a stable, creamy lather |
| Stearic acid | 2.8% | a saturated fatty acid that adds hardness and a thick, stable lather; a large share can speed up trace |
| Linoleic acid | 1.6% | a polyunsaturated fatty acid that is very conditioning but oxidises readily — a driver of DOS (dreaded orange spots) at high levels |
Babassu oil in the bar
On its own Babassu oil throws a big, quick, bubbly lather — the kind of foam most people associate with a cleansing bar. Balance it with conditioning oils so the lather stays generous without drying the skin.
Babassu oil traces at a moderate pace and firms up reliably thanks to its saturated fatty acids, making it forgiving for most cold-process work.
In a blend Babassu oil is the cleansing, lather-making component. It is usually kept to a minority of the oils and paired with conditioning oils like olive or a soft butter, which offset its tendency to dry the skin at higher amounts.
Closest substitutes for Babassu oil
Out of Babassu oil? These oils behave most like it in a bar — ranked by how close their hardness, cleansing and conditioning profile and lye (SAP) requirement are. The numbers are predicted properties for a 100% single-oil bar, not a safety guide; always recalculate the lye when you swap an oil.
| Oil | Hardness | Cleansing | Conditioning | SAP (NaOH) |
|---|---|---|---|---|
| Babassu oil (this oil) | 74 | 62 | 15 | 0.178 |
| Palm kernel oil | 73 | 63 | 18 | 0.178 |
| Coconut oil, 76°F | 78 | 66 | 10 | 0.183 |
| Coconut oil, virgin/92°F | 78 | 66 | 10 | 0.186 |
| Murumuru butter | 81 | 73 | 14 | 0.175 |
Using Babassu oil in a recipe
One gram of Babassu oil needs about 0.178 g of NaOH (sodium hydroxide) to turn fully to soap, within a documented range of 0.175–0.182 g/g across sources. The calculator below uses this value; always confirm the lye weight before you mix.
Its iodine value is about 15 — a low value, pointing to a hard, long-lasting bar with good shelf life. Iodine value is only a rough guide, not a hard rule, but it gives you a feel for how a bar built around this oil will wear.
Most soapers use Babassu oil at roughly 15–30% of their oils.
Maker's note: Coconut-like cleansing/lather; standard coconut-allergy substitute.
Calculate lye for Babassu oil
The calculator below is pre-loaded with Babassu oil. Enter your weights, add other oils, and it works out the exact NaOH (lye) weight, water and quality numbers. Always weigh lye, oils and water — never measure by volume, wear gloves and eye protection, and add lye to water (never the reverse).
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Where these numbers come from
Every figure on this page is backed by at least two independent references, listed below — so you can check our work instead of taking our word for it.
- Codex Alimentarius CXS 210-1999 — Named Vegetable Oils (Tables 1–2) — SAP 245–256 mg KOH/g; Table 1 fatty acids: C8:0 2.6–7.3, C10:0 1.2–7.6, C12:0 40.0–55.0, C14:0 11.0–27.0, C16:0 5.2–11.0, C18:0 1.8–7.4, C18:1 9.0–20.0, C18:2 1.4–6.6
- From Nature With Love — Saponification Chart — SAP range
- Artiz Soap — SAP Value Table — SAP cross-check
- The Conscious Life — Babassu oil (USDA SR28) — lauric 43.5, myristic 15, palmitic 8.2, caprylic 6, stearic 2.8, oleic ~11.4, linoleic ~1.6 g per 100 g of oil — a ~95% basis
SAP data last updated · 51 oils covered.
Babassu oil soap FAQ
- Can you make soap with 100% Babassu oil?
- It is not recommended. Babassu oil shows its best in a blend, usually up to about 30% of the oils. On its own the bar would be unbalanced — too harsh and drying for everyday use.
- What superfat should I use with Babassu oil?
- A 5% superfat is a safe starting point. Because Babassu oil is strongly cleansing, many makers superfat a little higher (around 6–8%) to soften its effect on the skin.
- Does Babassu oil speed up or slow down trace?
- Babassu oil traces at a moderate pace and firms up reliably thanks to its saturated fatty acids, making it forgiving for most cold-process work.