Soap CalculatorInstant recipe feedback

Soap Calculator — Make Soap Making Easy

Create your custom soap recipe with real-time lye and water calculations.

Jump to Builder Browse Quick Start

Recipe Flow

From mold to cure

Four connected tools, one workflow.

Modes

Beginner & Expert

Safe defaults first, full control when needed.

Output

Save, print & share

Reusable recipes with instant totals.

Balanced batch

Track oils, lye, water, additives, and notes in one place.

Quick start templates

Start from proven blends, then refine with your own ratios.

Current BatchBeginner Mode

Start a new batch

Recipe inputs look balanced. Review the result panel next.

Workspace status

Not saved yet

Add oils and a batch size to start automatic local saves.

Next step

Add the first oils

Start from a quick template or build your own blend from the oil list.

Selected Oils

Build the blend you want to evaluate.

Coverage

Target exactly 100% before making soap.

Total Oils

500 g

Batch size drives lye, water, and additive totals.

Workflow

Ready to review

Use the results panel after the builder looks balanced.

Units:

Beginner Mode

Batch Size

Ready

500 g ready

Oils Added

Pending

Pick oils or use a starter template.

Blend Total

Pending

Oil blend is balanced at 100%

Results

Pending

Finish setup to unlock the result panel

1 of 4 setup steps complete

Beginner flow keeps setup simple and safe.

Recent Recipes

Saved locally on this device. The latest version of each recipe updates automatically.

Up to 5 recipes

No saved recipes yet. Start a recipe and it will appear here automatically.

Recipe Builder

Beginner flow: set basics, add oils to 100%, then review results.

Recipe Basics

Start with batch size, soap type, and a clear label

Beginner Mode uses safe defaults: Superfat 5% and Water 38% of oils. Switch to Expert Mode for custom lye and water settings.

Recipe Name

Used for exports and printouts.

Lye Type

NaOH for bar soap, KOH for liquid soap.

Total Oil Weight

Combined weight of all oils.

Quick sizes:

Oils & Fats

0 oils0% assigned

Add oils until the blend reaches 100%, then review the results panel.

Add at least one oil to start the blend.

0% of oils added100% remaining

Oil percentages must total 100% before making.

Oils & Fats

Showing top 15 most common oils. Disable beginner mode to see all 31 oils.

No oils selected. Add oils to start your recipe.

Add oils to see results

Simple 4-Step Workflow

Set lye type, unit, and total oil weight.
Keep Beginner Mode defaults (or switch to Expert Mode).
Add oils until total percentage reaches exactly 100%.
Review lye/water totals and export your recipe.

Open Mold Calculator for batch sizing Open Fragrance Calculator for scent rates Browse the Oil Library for ingredient research Open Cure Tracker for ready dates Read the Beginner Guide for the plain-language workflow

Soap Calculator FAQ

Practical answers for common recipe setup questions.

What does this soap calculator compute?

It calculates lye amount, water amount, total batch weight, and recipe quality indicators from your selected oils and settings.

Can beginners use this safely?

Yes. Beginner Mode locks safe defaults (5% superfat and standard water settings) and highlights common input mistakes with one-click fixes.

Does it support liquid soap and hybrid lye?

Yes. You can switch between NaOH, KOH, and Hybrid modes in recipe settings.

How do I size a recipe for my mold?

Open Mold Calculator, enter mold dimensions or water-fill weight, then apply the calculated oil weight back to the main calculator.