How Many Carbs/Calories In Walnuts

One oz./ounce, when referring to food, is 28.35 grams (g). 100 grams is 3.53 ounces.
One milligram (mg) is 1/1000th gram. One microgram (µg) is 1/1,000,000th gram.

The source of the data can be found here. The source is the Norwegian Food Composition Database 2015, created by the Norwegian Food Safety Authority, The Norwegian Directorate of Health, and University of Oslo, in Norwegian, quality-assured labs. Their site is here.

Possibly related metadata for 'walnut'

Disclaimer: This description is part of a partially automated process of collecting data and might not be entirely accurate or even related.
A walnut is that part of any tree of the genus Juglans, particularly the Persian or English walnut, Juglans regia used for food after being processed while green for pickled walnuts or after full ripening for its nutmeat. Nutmeat of the eastern black walnut from the Juglans nigra is less commercially available, as are butternut nutmeats from Juglans cinerea. The walnut is nutrient dense with protein and essential fatty acids.
Source: Wikipedia. Source link.

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The nutrient table shows values per 100 grams of edible food (so the values also serve as percentages for gram units).

Food Item Walnuts
SubCat Nuts, almonds and seeds
Carbo (g) 2.7
Kilojoules (kJ) 2771
Kilocalories (kcal) 672
Fat (g) 65.2
Protein (g) 15.2
Salt (g) 0
Water (g) 4
Sugar (g) 0
Alcohol (g) 0
Beta-carotene (µg) 0
Calcium (mg) 94
Cholesterol (mg) 0
Copper (mg) 1.34
Dietary fibre (g) 6.7
Edible part (%) 45
Folate (µg) 98
FoodID 06.560
Iodine (µg) 9
Iron (mg) 2.9
Magnesium (mg) 160
Mono+Di (g) 2.6
MuFa (g) 8.9
Niacin (mg) 1.1
Omega-3 (g) M
Omega-6 (g) M
Phosphorus (mg) 380
Potassium (mg) 450
PuFa (g) 47.2
Retinol (µg) 0
Riboflavin (mg) 0.15
SatFa (g) 6.1
Selenium (µg) 3
Sodium (mg) 7
Starch (g) 0.1
Thiamin (mg) 0.34
TransFa (g) 0
Vitamin A (RAE) 0
Vitamin B12 (µg) 0
Vitamin B6 (mg) 0.54
Vitamin C (mg) 1
Vitamin D (µg) 0
Vitamin E (alfa-TE) 0.7
Zinc (mg) 2.7