How Many Carbs/Calories In Tuna in oil, drained, canned

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.

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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 Tuna in oil, drained, canned
SubCat Fish and fish products
Carbo (g) 0
Sub2Cat Fish products, sandwich fish
Kilojoules (kJ) 1078
Kilocalories (kcal) 259
Fat (g) 18.9
Protein (g) 22.3
Salt (g) 0.1
Water (g) 58
Sugar (g) 0
Alcohol (g) 0
Beta-carotene (µg) 346
Calcium (mg) 10
Cholesterol (mg) 38
Copper (mg) 0.09
Dietary fibre (g) 0
Edible part (%) 100
Folate (µg) 14
FoodID 04.107
Iodine (µg) 26
Iron (mg) 2.1
Magnesium (mg) 36
Mono+Di (g) 0
MuFa (g) 4.3
Niacin (mg) 8.5
Omega-3 (g) 0.3
Omega-6 (g) 4.9
Phosphorus (mg) 248
Potassium (mg) 442
PuFa (g) 10.8
Retinol (µg) 346
Riboflavin (mg) 0.15
SatFa (g) 2.7
Selenium (µg) 186
Sodium (mg) 37
Starch (g) 0
Thiamin (mg) 0.15
TransFa (g) 0
Vitamin A (RAE) 0
Vitamin B12 (µg) 4.5
Vitamin B6 (mg) 0.35
Vitamin C (mg) 0
Vitamin D (µg) 1.5
Vitamin E (alfa-TE) 3.3
Zinc (mg) 0.6