Data with sources. Assumptions in plain sight.
References consulted on . SoapDraft's text, interface and calculation engine are original. The catalog reproduces numerical facts and identifies the supplier and the variety.
Saponification chart for oils
Source: Natural Sourcing / From Nature With Love — Saponification Chart. Ranges in mg KOH/g; the working value is the midpoint converted to g/g. The values below are estimates, not certificates for your lot.
| Ingredient / variety | Range mg KOH/g | SAP KOH g/g | SAP NaOH g/g |
|---|---|---|---|
| Olive | 184–196 | 0.19000 | 0.13545 |
| Coconut, RBD (not fractionated) | 250–264 | 0.25700 | 0.18321 |
| Babassu | 245–256 | 0.25050 | 0.17858 |
| Castor, organic | 176–185 | 0.18050 | 0.12868 |
| Shea butter | 170–190 | 0.18000 | 0.12832 |
| Palm | 190–205 | 0.19750 | 0.14080 |
| Soybean | 180–200 | 0.19000 | 0.13545 |
| Sunflower, refined organic | 188–194 | 0.19100 | 0.13616 |
| Sweet almond, refined | 184–196 | 0.19000 | 0.13545 |
| Avocado, virgin | 177–198 | 0.18750 | 0.13367 |
| Rice bran | 185–195 | 0.19000 | 0.13545 |
| Grapeseed | 180–200 | 0.19000 | 0.13545 |
| Cupuaçu butter, deodorized | 180–200 | 0.19000 | 0.13545 |
| Murumuru butter | 245–260 | 0.25250 | 0.18000 |
| Brazil nut, organic | 186–196 | 0.19100 | 0.13616 |
Converting between lyes
NIST lists 39.9971 g/mol for NaOH and 56.1056 g/mol for KOH. The ratio of these masses is used to convert SAP values; purity is a separate input, taken from the product's documentation.
Fragrances and product types
IFRA explains limits by product type in the finished product. An example of a supplier document with the product-type classification lists rinse-off soaps under category 9. We do not use that example's usage rate: every fragrance or blend needs its own document.
Conventions, costs and handling
- SoapCalc: reference for the conventions for lye concentration, water:lye ratio and water as a percentage of oils. The calculations here are implemented independently.
- Sebrae — costs and selling price: a Brazilian small-business guide (in Portuguese) on costs and percentages applied to the selling price.
- Bramble Berry / Soap Queen — lye safety guide: protective gear, ventilation and mixing the lye solution. Also read the safety data sheet (SDS) for the product you use.
Limits of the tool
We do not model reaction kinetics, temperature, free lye, pH, microbiological stability, fatty acid profile or any performance guarantee. The engine does not interpret supplier documents: identifying and transcribing the values is the formulator's responsibility. Cure and density estimates must be checked against measurements.