Implemented by the Wine Council of Ontario in Canada, the sugar code of a wine is a numerical representation of its sweetness. Save for very dry wines, Sugar Codes are calculated:

Sugar Code = SR / W

Where

SR is residual sugar in grams
W  is volume of wine in litres

The amount of sugar is most often measured colourimetrically using refractometers.
Grams of              Sugar Code        Apparent Sweetness
Sugar per Litre

    0 to 4.9                0                Very Dry
  5.0 to 14.9               1                Dry
 15.0 to 24.9               2                Dry
 25.0 to 34.9               3                Medium
 35.0 to 44.9               4                Medium
 45.0 to 54.9               5                Medium
 55.0 to 64.9               6                Medium
 65.0 to 74.9               7                Sweet
 75.0 to 84.9               8
 85.0 to 94.9               9
 ...                        ...              ...
195.0 to 204.9             20
205.0 to 214.9             21
215.0 to 224.9             22
225.0 to 234.9             23
235.0 to 244.9             24
245.0 to 254.9             25
Ice wines often have a sugar code of 20 or more.

Consider that a can of Coke (with approximately 40 g of sugar per 355 mL can) would have an sugar code of close to 110.

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