Best oils for soap making

Why “best” depends on the bar you want

Handmade soap is a fatty-acid recipe problem: each oil brings a mix of lauric, myristic, palmitic, stearic, oleic, linoleic, and other fractions. Those fractions drive cleansing, hardness, conditioning feel, and how the lather behaves. So the honest answer to which oils are best for handmade soap is: the set that matches your label goals—body bar vs shampoo bar vs laundry-style cleansing—within your budget and sourcing ethics.

Use the fatty acid profile calculator to compare blends, and read Soap recipe formulation for percentage workflows before you lock a batch.

Olive oil vs coconut oil soap (the usual comparison)

Olive oil vs coconut oil soap is a classic teaching contrast because the two oils sit on different parts of the “cleansing vs conditioning” conversation for many formulas:

• Olive oil (often high oleic) is famous in castile-style bars: slower-to-trace habits in many workflows, and a fatty acid profile that many people associate with milder, more conditioning-forward tendencies when it dominates a blend—though the entire recipe still sets hardness and lather.
• Coconut oil (high lauric/myristic) tends to boost cleansing and bubbly lather tendencies and can contribute to hardness in a blend—but high coconut percentages can feel harsh to some skin if the formula lacks balancing oils and superfat strategy.

This is not a moral verdict on either oil—it is a design lever. Many successful bars combine them with other oils so neither has to do everything alone. Specialty pages like the Castile soap calculator exist for olive-heavy workflows; your SAP tables still rule the lye line.

A practical soap oils list (what makers actually weigh)

This soap oils list is not exhaustive—supplier catalogs change—but these categories show up constantly in handmade soap formulation:

• Liquid oils: olive, sunflower, rice bran, sweet almond, grapeseed (watch shelf-life and rancidity risk in long-cure bars).
• Hard oils and butters: coconut, palm (know your sourcing), cocoa butter, mango butter, shea—see the Shea butter soap calculator when shea is central to the design.
• Lather helpers: castor is widely used at modest percentages to support lather character in many formulas—still part of the fatty-acid total.

If you avoid animal inputs, treat the blend as a labeling and supplier question, then use tools like the Vegan soap calculator as a workflow companion—not a substitute for your ethics checklist.

Carrier oils soap: the terminology overlap

In skincare marketing, “carrier oils” usually means base oils that carry essential oils or act as bulk skin-care ingredients. In carrier oils soap conversations, many of the same liquids are saponified—so the word “carrier” does not change the chemistry. What matters is the oil’s fatty acid profile, quality, and how it ages in a bar.

Oil properties soap makers track

Useful oil properties for soap include: hardness tendency, cleansing tendency, conditioning tendency, lather type (bubbly vs creamy), iodine-related stability signals (rules of thumb, not perfection), and shelf-life realities. SoapLab’s soap hardness calculator and soap lather calculator help translate a percentage sketch into expectations; your soap calculator line still defines NaOH from SAP values.

What to do next

Pick a small test blend, enter grams in the soap calculator, and compare two candidate recipes in the fatty acid profile calculator before you scale. Browse the guides index for formulation and process articles.