Soap Calculator - Lye & INS

A professional soap-making tool for precise solid and liquid soap calculations, real-time recipe evaluation, INS insights, cost calculation, 170+ oils, and offline use.

Soap Calculator is a professional recipe formulation tool designed for handmade soap makers and enthusiasts.

From oil ratios and lye calculations to INS scoring, recipe evaluation, cost calculation, and recipe management, it helps you design, adjust, and keep track of your soap recipes with ease.

Supports both solid soap (NaOH) and liquid soap (KOH), with 170+ common and advanced oils built in. All data is stored locally, so the app works offline.

Core Advantages: Professional, Precise & Flexible

• Real-Time Recipe Evaluation: Adjust oil and additive ratios directly on the results page and see recipe properties and costs update instantly, making formulation and optimization more intuitive.

• Smart Recipe Scoring: Calculate SAP and INS values and get recipe property insights based on the INS range. A multi-dimensional radar chart visualizes hardness, cleansing, conditioning, lather, and silkiness.

• Solid & Liquid Soap: Supports both NaOH solid soap and KOH liquid soap calculations, with customizable lye purity.

• Cost Calculation: Enter ingredient prices to calculate total recipe cost and cost per bar. Volume units such as mL and fl oz are supported and can be converted to weight using the built-in standard density.

• 170+ Oils: A rich database of common and advanced oils with saponification values and fatty acid information, reducing the need to look up data elsewhere.

• Privacy First & Offline: Your data is stored locally and the app works without an internet connection, making it convenient for kitchens, workshops, and other offline environments.

Key Features: Fast & Flexible

• Flexible Inputs & Units: Switch between percentage and weight inputs, with support for metric and imperial units.

• Classic Recipes & Custom Templates: Explore classic recipes such as pure olive oil soap and Aleppo soap. Save, organize, and favorite your own recipes.

• Simple Making Guides: Quick reference tips for essential soap-making steps, including safety, temperature control, and unmolding.

• iPhone & iPad: Optimized for iPhone and iPad, with a split-screen layout on iPad for easier recipe reference and editing.

• Save & Share: Generate recipe images or text reports, and record making and unmolding dates in your calendar.

Basic recipe calculation is free forever. Pro is available as a one-time purchase to unlock the full set of advanced features, with no subscription and no ads.

Whether you make facial bars, body bars, household soap, or liquid soap, Soap Calculator provides clear and reliable data to help you formulate with confidence.