Snap a recipe photo for safe lye calculations instantly. Refine your oil blend with smart suggestions. Soapmaking made fast, clear, and calm.
The modern soap calculator built for speed, clarity, and confidence.
Simple SoapCalc calculates safe lye and water amounts for cold process, liquid soap, and hybrid recipes — instantly.
But it does more than math.
Snap a recipe photo
Import recipes from books, blogs, YouTube screenshots, or handwritten notes. Simple SoapCalc reads the image and builds your recipe automatically — no manual entry.
Refine your oil blend
Use Blend Advisor to get smart suggestions for stronger bars, more lather, gentler recipes, or better balance. Pick a goal and apply it with one tap.
Build with confidence
• Calculate accurate lye and water amounts
• Build recipes by weight or percentage
• Adjust superfat and water-to-lye ratio
• View soap properties like hardness, cleansing, and conditioning
• Explore full fatty acid profiles
• Save and sync recipes across devices
Make Soap mode
Switch to a step-by-step workshop checklist with your exact recipe measurements when you're ready to make a batch.
Simple SoapCalc was created to make soapmaking feel calm and clear again — without clutter, spreadsheets, or guesswork.
Informational guidance — never pass/fail scores.
Always follow proper soapmaking safety practices when handling lye.
Terms of Service: https://simplesoapcalc.com/terms
Ratings & Reviews
4.8
out of 5
5 Ratings
NEW IN v1.12:
NOW IN CHATGPT
• Simple SoapCalc is now in the ChatGPT App Store — brainstorm recipes through ChatGPT and we handle the math
FRAGRANCE SAFETY
• Per-oil IFRA warnings — push Tea Tree, Cedarwood, Rose, and 27 more essential oils past their Cat 9 cap and you'll see exactly where the safety line is
• 30 essential oils now have cert-validated IFRA Cat 9 caps — Rose, Geranium, Frankincense, Sandalwood, Ginger,and more
• Cumulative fragrance load banner — your total percentage updates live as you build the recipe
SMARTER ADDITIVES
• Pick an additive and the amount pre-fills to a safe starting point — no more guessing
• Warnings appear inline under each fragrance row in the editor — find what's over at a glance
• Tap "Why this amount?" on any curated additive to see usage range, IFRA cap, and scent character
VINEGAR LIQUIDS
• Apple cider vinegar now auto-adjusts your lye — the calculator handles the chemistry so you don't have to
CURATED LIST UPDATES
• Jasmine Sambac replaces generic Jasmine — Sambac is the safer species for soap, with much more headroom under its Cat 9 cap
• Spearmint, Clary Sage, Frankincense, Sandalwood, Geranium, and Rose moved into the right buckets so default amounts stay below their IFRA ceilings
• Search "ginger root" or "sambac absolute" — new aliases find the right entry
IMPROVEMENTS
• Pantry Variations duplicate-recipe bug fixed — same constraints now produce distinct variations
• Fast-trace warnings flag recipes with high coconut, castor, or rice bran — and ginger essential oil now joins the accelerator list alongside cinnamon and clove
• KOH/liquid soap recipes correctly suppress bar-soap unmold language; balanced-mix prose fixed for high-Castile blends
• Sharper unmold tiers ("Check at 12–24 hours"), better trace and cure predictions for high-coconut and pine-tar recipes, and additive amounts below 0.10 now show 2 decimals
Version 1.12
The developer, James Hogans, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Linked to You
The following data may be collected and linked to your identity:
Purchases
Contact Info
User Content
Identifiers
Data Not Linked to You
The following data may be collected but it is not linked to your identity:
User Content
Usage Data
Diagnostics
Privacy practices may vary, for example, based on the features you use or your age. Learn More
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
Seller
James Hogans
Size
82.7 MB
Category
Utilities
Compatibility
Requires iOS 15.5 or later.
iPhone Requires iOS 15.5 or later.
iPad Requires iPadOS 15.5 or later.
iPod touch Requires iOS 15.5 or later.
Mac Requires macOS 12.4 or later and a Mac with Apple M1 chip or later.