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Free Tools for Soap & Candle Makers

Six browser-based calculators that replace the math in your soap and candle workflow. No account, no ads, no paywalls — open a tool and get an answer in under a minute.

Soap Making Tools

For cold process, hot process, liquid, and melt-and-pour soap makers.

Free Lye Calculator

50+ oils

NaOH & KOH for cold process and liquid soap

Calculate exact lye amounts for any cold process or liquid soap recipe. Supports 50+ oils with accurate SAP values, adjustable superfat, and shows soap properties like hardness, cleansing, and conditioning.

For: Cold process and liquid soap makers

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Free Soap Cost Calculator

Margin targets

True cost per bar + wholesale and retail prices

Calculate your real cost per bar including materials, packaging, labor, and overhead. Get suggested wholesale and retail prices based on your target profit margin.

For: Soap makers selling their products

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Candle Making Tools

For container, pillar, taper, and wood-wick candle makers.

Free Candle Wax Calculator

All wax types

How much wax per container — any wax type

Calculate exact wax amounts for any container size. Supports soy, paraffin, beeswax, coconut, and parasoy blends. Includes fragrance oil calculation and waste buffer.

For: Container candle makers

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Free Wick Size Calculator

CD, ECO, LX, HTP

Right wick for your container diameter and wax

Get a starting wick size recommendation for your container diameter and wax type. Covers CD, ECO, LX, HTP, and wooden wick series with burn test guidance.

For: Candle makers dialing in burn quality

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Free Fragrance Load Calculator

By wax type

Max safe fragrance oil for any wax

Calculate the exact amount of fragrance oil for your batch based on wax type and desired load percentage. Shows both the recommended and maximum safe load for your wax.

For: Candle makers testing scent throw

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Business & Compliance

When you're ready to sell your products.

Free Soap Label Maker

Printable PDF

FDA-ready cold process soap labels

Design printable labels for your cold process soap with the ingredient list, net weight, and business info required by the FDA. Export as PDF.

For: Soap makers ready to sell

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How These Tools Fit Together

These calculators are designed to be used in sequence. A typical cold process soap workflow runs through three of them:

  1. Lye Calculator — enter your oils, get lye, water, and soap properties.
  2. Soap Cost Calculator — plug in ingredient prices and batch yield to know your true cost per bar.
  3. Label Maker — generate a compliant label for the finished bar.

A typical candle workflow uses three too:

  1. Wax Calculator — container volume and wax type in, total wax and batch sizing out.
  2. Fragrance Load Calculator — find the max safe fragrance oil for that wax.
  3. Wick Size Calculator — starting wick recommendation for the container diameter.

Every tool runs entirely in your browser. No data leaves your device, nothing is saved to a server, and there's no signup.

Want All of This in One App?

PotionHub is the desktop app for soap and candle makers who want to stop juggling tabs. It combines every calculator here with recipe storage, batch tracking, inventory, cost management, and one-click scaling — free during beta, no credit card required.

Get PotionHub Free