A soap calculator answers how much lye and water a formula needs. Soap making software keeps that calculation connected to the work that follows. SoapPilot lets you start with the public soap and lye calculator, save the formula to a private workspace, and carry the same data into purchasing, production, curing, and costing.
Soap recipe builder and lye calculator
Build bar, liquid, or hybrid formulas with oil percentages, total oil weight, superfat, lye type, lye purity, and liquid settings. The calculation uses each oil's NaOH or KOH SAP value and shows water, fatty-acid profile, hardness, cleansing, conditioning, bubbly and creamy lather, iodine, and INS indicators. The free calculator works without signup; saving creates a reusable recipe.
Learn the arithmetic in formula calculations explained, compare NaOH and KOH, or browse the oils and SAP value catalog before substituting an ingredient.
Saved formulas, revisions, and public recipes
Saved recipes preserve the formula instead of forcing repeated data entry. Duplicate and scale a formula, keep revision snapshots, attach formulation notes, or publish a deliberate public copy. Public formulas appear in the soap recipe database; account recipes remain private unless the maker chooses to publish them.
Ingredient inventory and supplier lots
Record oils, butters, fragrances, additives, lye, packaging, supplier lots, quantities, units, purchase cost, and remaining stock. Formula data can then be compared with available inventory so purchasing and production do not depend on a separate spreadsheet. A substitution still requires a fresh calculation because different oils can have different SAP values and fatty-acid profiles.
Batch production and cure tracking
Turn a saved recipe into a production batch, record actual measurements and process notes, assign a lot code, and follow the expected cure date. Batch records connect what was planned with what was made. Cure tracking shows what is curing, ready, due soon, or overdue without changing the original formula record.
Production costs and pricing
Ingredient-lot costs, packaging, labor, overhead, and yield can be assembled into a batch or unit cost. Pricing tools help compare cost of goods, channel fees, margin, and a proposed selling price. These are operational estimates; makers remain responsible for their own accounting, tax, and commercial decisions. See current plans and limits.
Labels, traceability, and safety records
Recipe ingredients can support INCI-backed label preparation while supplier documents, batch lots, and revisions preserve traceability. Software can organize evidence, but it does not certify a formula or finished product. Review the soap-making safety guidance, supplier documentation, and the rules for every market where a product is sold.
Do you need a calculator or a full workspace?
Use the free soap calculator for a one-off NaOH/KOH, water, superfat, and quality estimate. Use the full workspace when you need to save and compare formulas, know what ingredients are available, reproduce a batch, follow curing, or understand production cost. Compare all software features or create a free workspace when you are ready to save your calculation.