The modern soap calculator
with ingredient intelligence
Formulate, understand, save, and improve your handmade soap recipes — free. Built for the 100,000+ soap makers who need a reliable home.
Handcrafted bars
Cold process, hot process, melt & pour — every method supported with accurate calculations.
Precise formulation
Real-time lye and water amounts with fatty acid analysis and six soap quality metrics.
Quality ingredients
160+ oils, butters, and additives with SAP values, skin benefits, and sourcing data.
Precise Calculator
Real-time lye and water calculation with live quality analysis. Know exactly what your recipe will produce.
Ingredient Knowledge
Deep profiles for every oil and butter — fatty acids, skin behavior, SAP values, substitutions, and citations.
Soapy AI Assistant
Ask questions about your formula and get answers grounded in structured ingredient data, not guesswork.
See your recipe at a glance
Every quality metric visualized in real time as you build your formula.
Sample Recipe — 40% Coconut, 40% Olive, 10% Castor, 10% Shea
Featured Ingredients
Explore our most popular oils and butters used in soap making.