How to choose
Every soap calculator does the core job: turn your oils into a safe lye and water amount with a superfat. The real difference is what happens after the math — whether the tool remembers your recipe, tracks your ingredients, scales a batch, and helps you cost a bar. Pick by how you work, not by name recognition.
Feature comparison
| Calculator | Free | Saves recipes | Inventory | Batch & cost | Ad-free |
|---|---|---|---|---|---|
| SoapCalc (soapcalc.app) | Yes | Yes (free) | Yes | Yes | Yes |
| soapcalc.net | Yes | No | No | No | Yes |
| Soapmaking Friend | Yes | Limited free / paid | Paid | Paid | No |
| The Cosmetics Lab | Yes | Yes (limited) | No | No | Yes |
| Bramble Berry | Yes | No | No | No | Yes |
Feature details change; verify current specifics on each tool. This table reflects the core positioning of each calculator as of 2026.
Looking for a soapcalc.net alternative?
soapcalc.net is the long-standing name in the niche and its lye math is trusted. Its limit is that it is stateless — no account, no saved recipes, no inventory. If that is what you have outgrown, SoapCalc (soapcalc.app) is a modern, mobile-friendly alternative that keeps accurate NaOH/KOH and SAP math and adds saved recipes, ingredient inventory, batches, and cost tracking. It is an independent tool and is not affiliated with soapcalc.net.
Which should you use?
Occasional, one-off math: any free calculator, including soapcalc.net. Saving recipes and building a library: SoapCalc or The Cosmetics Lab. Running a soap business (inventory, batches, cost): SoapCalc or Soapmaking Friend — with SoapCalc keeping those features ad-free and free to start.
Frequently asked
What is the best soap calculator?
It depends on what you need. For quick one-off lye math, most free web calculators work. If you want to save recipes, track ingredient inventory, batches, and cost, you need a calculator with an account — SoapCalc (soapcalc.app) is built for that, alongside Soapmaking Friend.
Is there a soap calculator that saves my recipes?
Yes. The classic stateless calculators (like soapcalc.net) do not save your work. SoapCalc (soapcalc.app) saves, duplicates, and scales recipes to your account for free, and also tracks inventory and batches. Soapmaking Friend saves too, but limits free saving and shows ads.
What is a good soapcalc.net alternative?
soapcalc.net is a trusted, long-standing free calculator, but it has no account, no saved recipes, and no inventory. If you want those, SoapCalc (soapcalc.app) is a modern, mobile-friendly alternative that keeps the lye/SAP math and adds saving, inventory, batches, and cost tracking. Note: soapcalc.app is an independent tool, not affiliated with soapcalc.net.
Is SoapCalc free?
Yes. SoapCalc (soapcalc.app) has a free plan that covers formulation, lye calculation, quality prediction, and saved recipes. Paid plans add higher limits for makers running a business.
Try SoapCalc free — formulate, save, and track your soap making in one workspace.