Welcome to SoapMetrics: A Free Soap & Lye Calculator for Better Recipes
Whether you are creating your first batch of handmade soap or refining a formula you have made dozens of times, accurate lye calculations are one of the most important parts of building a soap recipe.
SoapMetrics is a free soap and lye calculator designed to help you formulate, analyze, and understand your recipes before you make the batch.
It supports NaOH, KOH, and dual-lye formulations, making it useful for cold process soap, hot process soap, liquid soap, and recipes that combine sodium hydroxide and potassium hydroxide.
More Than a Basic Lye Calculator
At its core, SoapMetrics performs the calculations needed to determine how much lye and water your soap recipe requires based on the oils and fats you select.
Each oil has its own SAP value, which determines how much sodium hydroxide (NaOH) or potassium hydroxide (KOH) is required for saponification. SoapMetrics handles those calculations automatically while allowing you to control important formulation settings such as oil weight, lye type, superfat, water, and lye concentration.
You can start building a recipe with the SoapMetrics soap calculator and see your calculations update as you make changes.
But calculating lye is only part of creating a good soap recipe.
Analyze Your Soap Recipe as You Build It
SoapMetrics provides real-time formulation information so you can understand what your combination of oils may produce before making the batch.
As you adjust your recipe, SoapMetrics can help you review information such as:
- Lye and water requirements
- Oil percentages and weights
- SAP-based calculations
- Fatty-acid composition
- Soap quality and formulation metrics
- Recipe balance
- Ingredient-related warnings and notifications
- NaOH, KOH, and dual-lye calculations
This makes SoapMetrics both a soap recipe calculator and a formulation tool for experimenting with different recipes.
For example, changing the amount of coconut oil, olive oil, castor oil, tallow, shea butter, or another ingredient can change the fatty-acid profile and characteristics of the finished soap. Seeing those changes while formulating makes it easier to compare recipes before committing ingredients to a batch.
Calculate Cold Process, Hot Process, and Dual-Lye Soap Recipes
SoapMetrics can be used for several common soap-making methods.
For traditional bar soap, you can calculate NaOH soap recipes for cold process or hot process soap making.
For recipes requiring potassium hydroxide, you can calculate KOH soap recipes, including formulations used for liquid and soft soaps.
SoapMetrics also includes a dual-lye calculator for recipes that combine NaOH and KOH. The calculator determines the required amount of each alkali based on your selected formulation rather than requiring you to calculate them separately.
The Soap Calculator Is Free
You do not need a Premium subscription to calculate soap recipes with SoapMetrics.
A free account gives you access to the core calculator and allows you to create recipes, review formulation analysis, and export your recipe information.
The goal is simple: the soap calculator remains a useful tool even if all you need is accurate soap and lye calculations.
Take a Recipe Beyond the Calculator
Soap making rarely ends when the recipe is calculated.
Once you start making multiple recipes and batches, you may also need to remember when a batch was poured, track cure dates, manage ingredients, monitor inventory, organize recipes, calculate production information, and keep notes about what worked.
SoapMetrics Premium expands the calculator into a larger soap-making management workspace with tools for areas such as:
- Saved soap recipes
- Batch and production tracking
- Cure and unmold reminders
- Ingredient and supply inventory
- Recipe organization
- Production notes
- Recipe exports and backups
- Soap business and production management
These tools are optional and work around the free calculator rather than replacing it.
If you are comparing tools for recipes, batches, inventory, and costs, see what soap making software includes and how SoapMetrics covers the full process.
Start Building Your Next Soap Recipe
If you already know the recipe you want to make, you can open the free SoapMetrics soap calculator and start formulating.
If you are new to SoapMetrics, the Getting Started guide explains the calculator and the other tools available throughout the site.
As this blog grows, we will also cover topics including lye calculations, SAP values, superfat, water-to-lye ratios, soap ingredients, cold process and hot process soap making, recipe formulation, batch production, soap pricing, inventory management, and building a handmade soap business.
Whether you need a simple lye calculation or want to manage the entire process around your recipes, SoapMetrics is designed to give you a better understanding of what goes into every batch.