Mood TT By AC — Formulation Tools
Lye Calculator
for cold-process soap
Pick your oils, set your batch size and superfat, and this works out exactly how much lye and water your recipe needs.
Batch weight
0 g
Your oil blend
0 oils
Total oil weight
0 g
Settings
5%
Oil left unreacted with lye, for a gentler, more moisturizing bar. 5% is a common default.
38%
Lower water (28–33%) speeds up cure time; higher water (38–42%) gives more working time before trace.
Recipe result
Total oils
0 g
Lye neededSodium hydroxide (NaOH)
0g
Waterdistilled, room temp before mixing lye
0g
Estimated batch weightoils + lye + water
0g
Soap quality (est.)
Estimated from typical published fatty acid profiles for these oils — the shaded band is the generally recommended range. Actual results vary by oil source and refinement; use as a directional guide.
Safety: Lye (NaOH/KOH) is caustic — always add lye to water, never water to lye, wear gloves and eye protection, and work in a ventilated space. SAP values here are commonly published averages; oils vary by source, so cross-check against your supplier’s SDS/SAP data before running a new recipe, especially at larger batch sizes.
Your batch
3%
Typical range for cold process soap: 3–6% of oil weight.
Fragrance result
Fragrance oil needed
0 g
In fluid ouncesapprox., FO density ~0.94 g/ml average
0fl oz
As % of batchyour selected fragrance load
0%
Note: These are common starting ranges, not IFRA limits for a specific fragrance oil. Always check the fragrance supplier’s IFRA certificate and usage guidance for skin-safe and flashpoint limits — some fragrance oils cap out well below the general range shown here, and candle wax type/vessel size can also affect max safe load.