Pineapple juice

One US cup of pineapple juice weighs 250 grams (8.8 ounces). Going the other way, 100 grams is about 0.40 cups.

Also called 100% pineapple juice, unsweetened pineapple juice, canned pineapple juice.

Fruit juices compared: cup weights side by side, the source behind each, and why they differ.

A cup of pineapple juice weighs 250 g (8.8 oz), a density of 1.06 g/mL. USDA weighs a cup at 250 g and Health Canada's 125 mL at 132 g, also 250 g per cup; the two agree within 0.1%.

Pineapple juice is pressed from pineapple flesh and cores, usually canned, and sold as 100% juice. In the kitchen it goes into marinades, where its enzyme bromelain tenderizes meat, into glazes for ham, cakes and frostings, and into cocktails such as the piña colada.

USDA's Standard Reference record for canned or bottled unsweetened pineapple juice (FDC 169947) gives 1 cup as 250 g and 1 fl oz as 31.3 g, both 1.057 to 1.058 g/mL, with 86.4% water and about 10% sugars. Health Canada's Nutrient Value of Some Common Foods weighs 125 mL of ready-to-drink pineapple juice at 132 g, 1.056 g/mL. Two independent government measurements land on the same figure, so the entry is held at high confidence.

The physical check: the FDA sets the minimum strength of 100% pineapple juice at 12.8 °Brix, and a sugar solution of that strength weighs 1.049 g/mL by the USDA sucrose table, 248 g per cup. Pineapple juice carries a little more than that, plus citric acid and fine fruit solids, which takes it to the measured 1.056 to 1.058.

Pineapple juice weighs about the same as orange juice (248 g per cup on this site) and a little less than grape juice (253 g), in line with their sugar. Juice drained from canned pineapple is not the same product: fruit packed in heavy syrup gives a sweeter, heavier liquid, and fruit packed in juice gives about the same.

As with every juice, the filling method makes no difference: a liquid fills the cup completely, so the cup weight depends only on what is dissolved in it. Pineapple juice from concentrate is reconstituted to at least the same 12.8 °Brix and weighs the same per cup as not-from-concentrate juice. Light pineapple juice drinks, diluted with water, weigh closer to water's 236.6 g per cup.

Practical guidance: use 250 g per cup, 125 g per half cup, 63 g per quarter cup and 15.6 g per tablespoon. A 46 fl oz can holds 5 3/4 cups, about 1.44 kg, and a 6 fl oz can about 188 g. Measured by volume, a liquid measuring cup is accurate enough; weigh only when a recipe gives grams.