GIFSQ Tools · Module 09 — Fruits, Vegetables, Beverages & Plant Foods · Tool 166 of 500
Jam batch formulation with evaporation. Enter fruit, sugar and added water plus the evaporation loss to get the finished batch, sugar share and estimated soluble solids.
Try sample values — fills the form with the worked example below.
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Finished jam (kg)
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Sugar in finished jam (%)
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Estimated soluble solids (%)
Equation: Total in = fruit + sugar + water. Finished jam = total in × (1 − loss % ÷ 100). Sugar % = sugar ÷ finished jam × 100. Estimated soluble solids % = (sugar + fruit × 0.12) ÷ finished jam × 100.
Method: Mass balance for jam manufacture, Codex CXS 296 (jams, jellies and marmalades); soluble solids by AOAC 932.12 (refractometer).
Assumptions: Fruit contributes about 12 % soluble solids; only water evaporates, so all sugar and fruit solids stay in the jam.
Limitations: The 12 % fruit-solids figure is a guide only — real fruit varies, so the finished Brix must be measured; pectin and acid are not covered here.
Rounding: Masses and percentages to 2 decimal places. Intermediate values are not rounded.
This is a calculation aid, not a laboratory report — confirm against your accredited method before citing a value.
Method: Mass balance for jam manufacture, Codex CXS 296 (jams, jellies and marmalades); soluble solids by AOAC 932.12 (refractometer).
Assumptions: Fruit contributes about 12 % soluble solids; only water evaporates, so all sugar and fruit solids stay in the jam.
Limitations: The 12 % fruit-solids figure is a guide only — real fruit varies, so the finished Brix must be measured; pectin and acid are not covered here.
Rounding: Masses and percentages to 2 decimal places. Intermediate values are not rounded.
This is a calculation aid, not a laboratory report — confirm against your accredited method before citing a value.
Worked example: 10 kg fruit, 10 kg sugar, 2 kg water, 25 % evaporation loss. Total in = 22 kg; finished jam = 22 × 0.75 = 16.50 kg; sugar = 10 ÷ 16.50 × 100 = 60.61 %; estimated soluble solids = (10 + 1.2) ÷ 16.50 × 100 = 67.88 %.
Enter values above to see results.
Codex asks for at least 60 % soluble solids in jam. Boil to the target solids and confirm with a refractometer — do not rely on the estimate alone. Tool 166 of 500 — GIFSQ
