GIFSQ Tools · Module 07 — Dairy, Milk, Cheese & Fermented Products · Tool 122 of 500
Work out the solids-not-fat (SNF) of milk from total solids and fat, and see the SNF on a dry basis.
Try sample values — fills the form with the worked example below.
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Solids-not-fat (%)
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SNF on dry basis (%)
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Total solids (%)
Equation: Solids-not-fat (%) = total solids (%) − fat (%). SNF on dry basis (%) = SNF ÷ total solids × 100.
Method: Solids-not-fat by difference from total solids (ISO 6731, IDF 21) and fat (ISO 1211 Röse-Gottlieb or ISO 9622 mid-infrared). SNF covers protein, lactose and minerals.
Assumptions: total solids and fat are measured on the same sample and the same basis; the fat result is the true fat, not a lactometer estimate.
Limitations: SNF by difference inherits the error of both measurements; it cannot detect which component is low — protein and lactose need their own tests.
Rounding: percentages to 2 decimal places; intermediates unrounded.
This is a calculation aid, not a laboratory report — confirm against your accredited method before citing a value.
Method: Solids-not-fat by difference from total solids (ISO 6731, IDF 21) and fat (ISO 1211 Röse-Gottlieb or ISO 9622 mid-infrared). SNF covers protein, lactose and minerals.
Assumptions: total solids and fat are measured on the same sample and the same basis; the fat result is the true fat, not a lactometer estimate.
Limitations: SNF by difference inherits the error of both measurements; it cannot detect which component is low — protein and lactose need their own tests.
Rounding: percentages to 2 decimal places; intermediates unrounded.
This is a calculation aid, not a laboratory report — confirm against your accredited method before citing a value.
Worked example: Total solids 12.5%, fat 3.5%. SNF = 12.5 − 3.5 = 9.00%; SNF on dry basis = 9.00 ÷ 12.5 × 100 = 72.00%.
Enter values above to see results.
Whole cow milk is typically about 8.5–9.0% SNF; below 8.5% is the usual flag for added water. Tool 122 of 500 — GIFSQ
