Goose Fat
Also: Rendered goose fat, Anser anser domesticus fat, Schmalz (goose).
Published values
| Saponification value | 195 mg KOH/g |
| Used by the calculator | 195.0 mg KOH/g (typical) |
| SAP for NaOH | 0.1390 g/g |
| Iodine value | 86.8 g I₂/100 g |
| INS (SAP − IV) | 108 |
| Melting point | — |
| Unsaponifiable matter | — |
One soapmaking book prints 0.135 g NaOH per g. Why book figures and ours can differ.
A bar made of 100 % Goose Fat
Conventional qualities summed from the fatty-acid groups; a single-oil bar is a reference point, not a recipe.
How much lye
| Oil | NaOH | KOH |
|---|---|---|
| 500 g | 66.0 g | 92.6 g |
| 1 kg | 132.1 g | 185.3 g |
| 1 lb (454 g) | 59.9 g | 84.0 g |
| 2 lb (907 g) | 119.8 g | 168.1 g |
For this oil alone at 5 % superfat, with pure sodium hydroxide (NaOH) or pure potassium hydroxide (KOH); in brackets, across the published range of its saponification value. KOH is usually sold at 90 %: divide by 0.9. For a whole recipe, open the calculator.
Fatty-acid profile
Saturated : unsaturated 29 : 71
| Fatty acid | Published range, % | Used | |
|---|---|---|---|
| Myristic acid | C14:0 · saturated | 0.52 | 0.5 |
| Palmitic acid | C16:0 · saturated | 21.7 | 21.7 |
| Palmitoleic acid | C16:1 | 2.94 | 2.9 |
| Stearic acid | C18:0 · saturated | 6.39 | 6.4 |
| Oleic acid | C18:1 | 56.08 | 56.1 |
| Linoleic acid | C18:2 | 10.27 | 10.3 |
| α-Linolenic acid | C18:3 n-3 | 0.52 | 0.5 |
| Gadoleic acid | C20:1 | 0.1 | 0.1 |
Where these numbers come from
Tables 2 and 3, non-additivated unheated goose fat: saponification value 195 mg KOH/g, iodine value 86.8 g I2/100 g, acid value 0.22, peroxide value 2.28. Published 2024.
Retrieved through the FoodData Central API search endpoint (dataType SR Legacy); nutrient rows SFA 14:0, 16:0, 18:0; MUFA 16:1, 18:1, 20:1; PUFA 18:2, 18:3; total lipid 99.8 g per 100 g.
Saponification and iodine values are the untreated, unheated control goose fat in Foods 13(2):304 (2024): fat rendered from Landaise-breed goslings (male and female, 18 weeks), Tables 2-3: saponification value 195 mg KOH/g, iodine value 86.8 g I2/100 g, acid value 0.22 g oleic acid/100 g, peroxide value 2.28 meq O2/kg (single batch; the paper's lard control gave SAP 194, IV 74.7). The paper's Table 4 fatty-acid data are expressed in g/100 g fat with implausibly low totals (SFA 2.32, MUFA 2.37, PUFA 3.76) and are not used. The fatty-acid profile here is USDA FoodData Central SR Legacy 'Fat, goose' (fdcId 173572, NDB 04576): total lipid 99.8 g/100 g; SFA 27.7 (14:0 0.5, 16:0 20.7, 18:0 6.1); MUFA 56.7 (16:1 2.8, 18:1 53.5, 20:1 0.1); PUFA 11.0 (18:2 9.8, 18:3 0.5). Those are grams of fatty acid per 100 g of fat; the field holds percent of total fatty acids, so each is divided by USDA's own total for the entry (SFA 27.7 + MUFA 56.7 + PUFA 11.0 = 95.4 g/100 g): myristic 0.52, palmitic 21.70, palmitoleic 2.94, stearic 6.39, oleic 56.08, gadoleic 0.10, linoleic 10.27, linolenic 0.52 %. They come to 98.52 %; the rest are acids USDA counts in its totals without listing them. Until 2026-09-25 the record held the grams per 100 g, which put its soap qualities about 5 % low. Melting point and unsaponifiables not sourced (null). INCI not verified (null).
This record is part of the open ingredient database (ODbL), which you can download as CSV or JSON. Found an error or a better primary source? Corrections with a link to the document are welcome at support@soapformulator.com.