Chemistry
Saponification Value Calculator
Calculate the saponification value of a fat or oil from a back-titration against potassium hydroxide.
Your inputs
Change any value to update the result instantly.
Saponification value
154.275 mg KOH/g
Titre difference
11 mL
KOH consumed by the sample
5.5 meq
Equivalent NaOH value
110 mg NaOH/g
Average molar mass of the fatty acids
1,090.9 g/mol (triglyceride)
The factor 56.1 is the molar mass of KOH in g/mol, which converts milliequivalents into milligrams of KOH.
What this calculator does
Calculates the saponification value of a fat or oil from a back-titration of excess potassium hydroxide.
What your result means
Milligrams of KOH needed to saponify one gram of the oil. A higher value means shorter average fatty-acid chains.
Formula and working
SV = (V_blank − V_sample) × N_KOH × 56.1 ÷ m_sample
- 1
Collect the inputs
Titre for the blank (V_blank) = 26 mL; Titre for the sample (V_sample) = 15 mL; Normality of the acid used (N) = 0.5 eq/L; Mass of the oil sample (m) = 2 g
- 2
Apply the formula
SV = (V_blank − V_sample) × N_KOH × 56.1 ÷ m_sample
- 3
Result
Saponification value = 154.275 mg KOH/g
Frequently asked questions
Symbols and assumptions
- SV
- Saponification value in mg KOH per g
- V_blank, V_sample
- Titre volumes in mL
- N
- Normality of the titrant
- m
- Sample mass in g
- • The blank and sample are titrated with the same standard acid.
- • The factor 56.1 is the molar mass of KOH in g/mol.
Sources and review
Reviewed 2026-09-22 · Next review 2027-09-22
- • Free fatty acids and unsaponifiable matter shift the result; the triglyceride molar mass shown is an approximation.
Important limitation
This is an educational estimate based only on the values and formula shown. Verify current rates, rules, units, and professional standards before relying on the result. It is not personalized financial or investment advice.
Report a mistake or request an improvement
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