Plum
Juice

One pound of plums (approximately 454g), pitted before juicing, yields roughly 260–295ml in a masticating juicer — about 9–10 oz, just under a full glass. A cold press juicer pulls a similar range: 280–315ml when produce is ripe and at room temperature. Centrifugal juicers extract noticeably less — typically 220–260ml from the same pound, with wetter, less-extracted pulp.

Ripeness matters more with plums than most produce. Fully ripe fruit has broken down more of its pectin structure, which dramatically improves extraction. Under-ripe plums can drop yields by 15–20% regardless of juicer type.

A medium plum weighs roughly 65–75g before pitting. After pit removal, you're working with about 55–65g of flesh per fruit. To fill an 8 oz (240ml) cup in a masticating juicer, plan on 5–7 medium plums, or roughly 350–450g whole weight.

Centrifugal juicers need more — closer to 7–9 medium plums for the same cup. Smaller Italian prune plums run about 30–40g each, so double those counts. For quick batch math with your actual plum size and juicer, use the calculator.

A 3 lb bag (1,360g) yields approximately 780–885ml in a masticating juicer — roughly 26–30 oz, or 3–4 full glasses. The same bag in a centrifugal juicer produces closer to 650–790ml.

If you're prepping a batch for the week, 3 lbs gives you 3–4 daily servings of 8 oz each. For a juice blend where plum is one of several ingredients, a single pound adds meaningful volume and flavor without dominating the batch.

Three factors matter most with plums: ripeness, temperature, and variety. Fully ripe plums have softer, more porous cell walls that release juice much more readily — overripe fruit that's beginning to ferment will actually yield slightly less due to structure breakdown. Room-temperature plums extract better than cold fruit straight from the fridge.

Variety plays a larger role than most people expect. Japanese plums (Santa Rosa, Black Splendor) are juicier and higher-water than European varieties (Italian prune, Damson), which are drier and more concentrated. The yield ranges on this page reflect a typical Japanese plum. European plum varieties may run 10–15% lower.

Yes, and the gap is larger with plums than with most vegetables. Plums contain heat-sensitive anthocyanins and vitamin C — both degrade with oxidation. Centrifugal juicers introduce significant air during extraction, degrading vitamin C by 20–35% and partially oxidizing the anthocyanins that give plum juice its deep color.

Cold press and masticating juicers preserve considerably more of both. The nutrition values on this page are calculated for cold press and masticating yields. A centrifugal cup of plum juice will have meaningfully lower antioxidant content — and a noticeably lighter, browner color — even at the same serving size.

Moderate to moderately high — about 14.5g of natural sugar per 100ml juice, which works out to roughly 35g in a full 8 oz glass. That's higher than carrot or celery juice but comparable to apple juice (around 26g per 8 oz for fresh-pressed). The sugar is predominantly glucose and fructose from the fruit's natural carbohydrates.

Plum's glycemic index (GI) runs around 39 for whole fruit — low enough that the sugar hits the bloodstream gradually. Juicing removes fiber, which speeds that up somewhat. If you're watching blood sugar, keep plum juice to 4–6 oz servings and pair with lower-sugar produce like cucumber, celery, or ginger.

Yes — always remove the pit. Plum pits (stones) contain amygdalin, a compound that can break down into hydrogen cyanide when mechanically crushed. Most home juicers won't crack a hardened plum stone, but twin gear machines and high-pressure cold press systems can fracture them. The risk isn't from accidentally swallowing a small amount of pit material, but from grinding pits intentionally or systematically.

Pitting also protects your juicer. Plum stones are hard enough to damage auger gears and centrifugal blades on repeated contact. Cut plums in half and pull the pit out before feeding them in — it takes seconds and protects both the equipment and the juice.

No — leave the skin on. Plum skin contains the highest concentration of anthocyanins, the polyphenol pigments responsible for the deep purple-red color and much of the antioxidant value. Peeling removes that entire layer.

The skin does contribute a mild astringent, slightly tannic flavor — especially in European-style varieties. If that's too pronounced, try blending with apple or pear to balance it rather than peeling. Wash the skins thoroughly before juicing, especially for conventional (non-organic) plums, which are frequently sprayed.

Fresh plum juice has a deep sweet-tart flavor with a subtle wine-like quality — more complex than most stone fruit juices. The tartness comes from malic acid; the depth comes from the skin-derived tannins and phenolics. The color ranges from rose-pink (yellow plums) to deep burgundy-purple (black varieties), and the flavor tracks with color: darker plums taste richer and more tannic.

It pairs exceptionally well with ginger (which sharpens the tartness), apple (which smooths and sweetens), lemon (which brightens), and beet (which deepens both color and earthiness). For a simple daily blend: 2–3 plums, 1 apple, and a 1-inch knob of ginger makes a well-rounded 8 oz glass.

Yes — and the laxative effect is real. Fresh plum juice contains sorbitol, a sugar alcohol with osmotic properties that draws water into the colon. Even a few ounces of plum juice can noticeably accelerate digestion in people sensitive to sorbitol. For most adults, 4–8 oz per day is the practical upper limit before digestive effects become disruptive.

The sorbitol content in fresh plum juice is lower than in commercial prune juice (made from dried plums, which concentrate it significantly), but it's still relevant — especially if you're combining plum juice with other high-sorbitol fruits like pear or apple. If you're new to plum juice, start with 4 oz and see how your system responds.

Fresh-pressed plum juice should be consumed within 24–48 hours when stored in a sealed container in the refrigerator. The anthocyanins that give it its color are relatively unstable — you'll notice the juice oxidizing and browning within hours if left open to air.

Cold press juice keeps marginally longer than centrifugal-extracted juice (up to 72 hours vs 24–48 hours) due to lower initial oxidation. For best color, flavor, and nutritional value, drink it the same day. If you're batch-prepping, freeze in individual portions — plum juice freezes well and retains color and nutrients better than refrigeration over several days.