Saponification Number Calculator

The saponification number of an oil or fat tells you how much alkali is needed to convert it into soap — a critical quality parameter in soap-making, cosmetics, and food chemistry. Enter your blank titration volume, sample titration volume, KOH solution molarity, and sample weight into the Saponification Number Calculator to get the result in mg KOH/g. You'll also see the NaOH and KOH lye requirements per 100g of oil, plus a quality assessment comparing your result against the expected range for your selected oil or fat type.

ml

Volume of KOH solution used in blank titration

ml

Volume of KOH solution used in sample titration

mol/L

Molarity of the potassium hydroxide solution used

g

Weight of the oil or fat sample tested

Select oil type for reference comparison (optional)

Results

Saponification Number

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NaOH Requirement

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KOH Requirement

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Quality Assessment

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Results Table

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Frequently Asked Questions

What is saponification value?

Saponification value (SV) is the amount of potassium hydroxide (KOH) in milligrams needed to completely saponify one gram of fat or oil. It indicates the average molecular weight of fatty acids in the oil and is crucial for soap making calculations.

How can I calculate the saponification value of oils?

The saponification value is calculated using the formula: SV = (Blank - Sample) × Molarity × 56.1 / Weight. You need titration volumes for blank and sample, KOH molarity, and sample weight to determine the exact saponification number.

What does a high saponification value mean?

A high saponification value indicates the oil contains more short-chain fatty acids, requiring more lye for complete saponification. Coconut oil has a high SV (248-265), while olive oil has a lower SV (185-196), affecting soap hardness and lather properties.

Is saponification value the same as saponification number?

Yes, saponification value and saponification number refer to the same measurement. Both terms describe the milligrams of KOH needed to saponify one gram of fat or oil, and they are used interchangeably in soap making and oil analysis.

Why is saponification number important for soap making?

The saponification number determines how much lye (sodium or potassium hydroxide) you need to convert oils into soap. Using the wrong amount can result in either excess lye (caustic soap) or excess oils (soft, greasy soap).

What is the typical range for saponification values?

Most common soap-making oils have saponification values between 160-265 mg KOH/g. Coconut oil has the highest (248-265), while jojoba oil has among the lowest (92-97). This wide range shows why accurate calculations are essential.

How accurate should saponification value measurements be?

Saponification value should be measured to at least one decimal place for soap making accuracy. Small variations can significantly impact the final soap quality, so precise titration techniques and calculations are important for consistent results.