Formulate with confidence
Build solid, liquid, or hybrid soap recipes with live lye, liquid, superfat, and oil calculations.
Built for thoughtful soap makers
Formulate better soap. Manage every batch.
SoapCalc.app combines a free soap and lye calculator for NaOH, KOH, water, superfat, and SAP values with saved recipes, ingredient inventory, batch production, cure tracking, and production costs.
Selling your soap? Try Studio free for 30 days — labels, batch costs and cure tracking. Card required, first payment on day 30, cancel any time.
Guided starter recipeIngredient tipsPrivate by default
Good morning, Maya
Your soap studio
Starter formula
Gentle Lavender Soap
Olive oil45%
Coconut oil25%
Shea butter15%
Sweet almond10%
Castor oil5%
12 days
until the next batch is cured
3 tips
oil balance, lather, and cure suggestions
Spider chart profile
See bubbly, cleansing, conditioning, hardness, longevity, and cream at a glance.
Try the soap calculator
Add your oils and get lye, water, and a quality profile instantly — no signup. Open the full calculator
Oils & butters
70%Olive Oil400 g
Palm Oil300 g
NaOH lye
91.9 g
Water
186.6 g
Hardness30.6
Cleansing0.4
Conditioning67.9
Bubbly0.4
Creamy30.1
Longevity30.1
Iodine: 68.1INS: 125.8
Ingredient label (draft)
Olea Europaea Fruit Oil, Elaeis Guineensis Oil, Aqua, Sodium Hydroxide
Pre-saponification draft in descending order of weight — review it before using it on a product.
Save this label & recipe — 30 days free, card required, cancel any timeImport your recipeCreate a free account to saveCalculating is free — saving needs a free account. Selling your soap? See costing, inventory & batch plans →
One connected workflow
Less spreadsheet juggling. More confident making.
Move from recipe to batch
Turn a saved formula into a production record without rebuilding the same information.
Stay ahead of curing
Track cure dates and see what is due soon, ready, or overdue from one calm dashboard.
Learn while you build
Use recipe suggestions, ingredient notes, recommended ranges, and practical tips as you make decisions.
A clearer process
From first idea to cured inventory.
Every part of SoapCalc.app is designed to preserve the decisions you already made, explain why they matter, and keep production records connected to the formula behind them.
- 01
Build your formula
Choose your soap type, units, liquid method, superfat, oils, additives, and fragrance.
- 02
Review the profile
Use spider charts, suggested ranges, ingredient context, and tips to understand the recipe before saving it.
- 03
Run production
Create a batch, record measurements, then follow curing through completion.
Designed for careful decisions.
Soap making involves caustic materials and formulation choices that deserve clear context. SoapCalc.app pairs calculations with visible assumptions, recommended formula patterns, supplier-aware ingredient records, revision snapshots, and practical safety reminders.
Read our safety approachLearn as you build
Our guides and in-recipe suggestions explain the decisions behind the calculator, from SAP values and superfat to cure time, oil behavior, additives, and common soap making pitfalls.
Frequently asked questions
Start with clarity.
Can I use SoapCalc.app as a beginner?+
Yes. A guided starter formula and plain-language explanations help you understand each decision before you make a batch.
Does SoapCalc.app calculate NaOH and KOH?+
The recipe workspace supports solid, liquid, and hybrid soap workflows with the relevant lye and purity settings.
Can I track curing and inventory?+
Yes. Recipes connect to batches, cure dates, ingredient stock, cost lots, and low-stock signals.
Is my recipe data private?+
Your workspace data is scoped to your account. Public sharing is an explicit recipe choice, not the default.
Your next formula deserves a better workspace.
Begin with a guided example, learn the workflow, and create your first private recipe when you are ready.
Create your workspaceSelling your soap? See plans for selling makers →