Soap Lye Calculator — AmberDevTools

Calculate lye and water amounts for cold process soap making.

How to use:

Enter total oil weight and SAP values
Set superfat percentage (usually 5%)
Calculate lye and water needed
Safety: always add lye to water, never reverse

Oil Blend

Total Oil Weight (g) Superfat (%) Avg SAP

// SAFETY WARNING

ALWAYS add lye to water, NEVER water to lye.
• Wear goggles, gloves, and long sleeves
• Work in ventilated area — lye fumes are caustic
• Have vinegar on hand to neutralize spills
• Keep pets and children away
• Never touch raw soap — wait 24-48h for saponification