Spinach
Juice

One pound of spinach (about 454g) yields roughly 310–330ml in a hydraulic press juicer — just over 10 oz. A masticating or single-auger juicer extracts significantly less: approximately 180–210ml from the same pound.

Centrifugal juicers perform worst with leafy greens — expect only 115–145ml from a pound of spinach, less than half the hydraulic press yield. This gap is larger for spinach than for almost any other produce, which makes juicer choice particularly consequential if you juice greens regularly.

For 8 oz (240ml) of spinach juice in a hydraulic press, plan on approximately 340–360g of fresh spinach — roughly 10–12 packed cups. That's a substantial quantity; spinach compresses dramatically in the juicer and most of its weight is water and fiber that stays in the pulp.

A masticating juicer needs about 520–600g (15–17 packed cups) for the same 8 oz serving. Centrifugal juicers require more still — around 750–900g or 22–28 packed cups — which is why most commercial green juice operations use slow presses.

A standard 5 oz (142g) bag of baby spinach yields approximately 95–100ml in a hydraulic press — just over 3 oz, enough for a small shot or to add to a blend. In a masticating juicer, the same bag produces about 57–65ml.

One pound (454g) of spinach in a hydraulic press gives you roughly 310–330ml — a little over 10 oz. If you're building a full 16 oz green juice with spinach as the base, you'd need nearly 2 lbs of spinach — which is why most recipes cut it with high-water produce like cucumber or celery. For exact quantities, use the calculator.

Spinach is one of the most juicer-sensitive produce items studied — the Walsh Medical Media comparison found centrifugal juicers extracting only 27.7% yield versus 70.9% for the Pure Juicer hydraulic press. That's a 2.5x difference from the same produce.

Leafy greens don't release juice easily through spinning alone. Centrifugal juicers rely on shredding and centrifugal force, which tears the cell walls but doesn't press out the liquid effectively. Slow auger juicers crush more completely, and hydraulic presses apply sustained high pressure — the most effective mechanism for any leafy green. If you juice spinach regularly, juicer type matters more here than with any root vegetable.

Yes, in two distinct ways. First, higher-yield juicers extract more total nutrients per batch — a hydraulic press juicing 1 lb of spinach delivers more than twice the iron, vitamin K, and folate of a centrifugal juicer working the same pound.

Second, oxidation affects heat-sensitive nutrients like vitamin C and folate. Centrifugal juicers spin at high RPM, introducing air that degrades these compounds during extraction. Cold press and hydraulic press methods minimize oxidation, retaining more of spinach's folate (roughly 300mcg per 100ml juice) and vitamin C (around 35–40mg per 100ml). The nutrition values on this page reflect cold press yields — centrifugal values will be both lower volume and somewhat lower nutrient density per serving.

Yes — spinach juice is one of the most iron-dense vegetable juices available. At approximately 4.2mg per 100ml, a single 8 oz glass delivers roughly 23–27mg of iron — well above the 8–18mg daily recommended intake for most adults.

There's an important caveat: spinach contains non-heme iron, which is less bioavailable than heme iron from animal sources. Absorption rates range from 2–20% depending on the meal context. Adding vitamin C-rich ingredients — lemon juice, orange, or apple — significantly improves non-heme iron absorption. Spinach juice taken with a calcium-heavy meal (dairy, fortified foods) will have reduced iron uptake, as calcium competes for the same absorption pathway.

For most healthy people, moderate spinach juice intake poses no oxalate risk. Spinach is high in oxalates — roughly 600–750mg per 100g raw — but daily consumption of 1–2 cups of diluted green juice (spinach as one ingredient among several) keeps oxalate exposure well within normal range for most adults.

The concern is real but context-dependent. A documented case of acute oxalate nephropathy involved consuming approximately 1,312mg of oxalate daily from spinach alone — roughly 2 cups raw per day — combined with severe dehydration. For people with a history of calcium oxalate kidney stones, limiting spinach in juice and staying well hydrated are sensible precautions. If spinach is one ingredient in a 16 oz green juice blended with cucumber, celery, or apple, the per-serving oxalate load drops substantially. Rotating your leafy greens — spinach, kale, chard, romaine — is a practical way to avoid chronic high oxalate intake.

Plain spinach juice is earthy and mildly grassy with very low sweetness — less bitter than kale, but not pleasant to drink straight for most people. The sugar content is exceptionally low (about 0.7g per 100ml), so there's almost nothing to offset the green flavor.

It mixes extremely well with apple (which masks the earthiness and adds natural sweetness), cucumber (neutral, high water, good for dilution), lemon or lime (brightens the flavor considerably and boosts iron absorption), and celery (similar flavor profile, adds sodium). Ginger cuts the green taste and adds warmth. A baseline recipe that works: spinach, cucumber, green apple, lemon, and a small piece of ginger — this produces a balanced green juice where spinach is present but not dominant.

Spinach juice is more perishable than most vegetable juices. In a sealed glass container, cold press spinach juice is best within 24–48 hours — the high chlorophyll content oxidizes and the flavor turns noticeably more sulfurous after that. Centrifugal spinach juice degrades faster due to oxidation during extraction and is best consumed immediately or within 12 hours.

Adding lemon juice serves double duty: it slightly slows oxidation and improves the flavor. If you need to batch-prep spinach juice, hydraulic press (Norwalk, Pure Juicer) produces juice that holds better than any other method — some practitioners store it up to 72 hours in a fully sealed, filled container with minimal headspace.

For most healthy people, moderate daily spinach juice — 4–8 oz as part of a green juice blend — is safe and nutritionally beneficial. The vitamin K, folate, iron, and calcium content make it a strong daily nutritional anchor.

Two considerations for daily drinkers. First, the oxalate load: rotating spinach with other leafy greens (kale, romaine, chard, parsley) spreads oxalate exposure and covers a broader range of nutrients. Second, vitamin K is present at very high levels in spinach juice — approximately 744mcg per 100ml, compared to a recommended daily intake of 90–120mcg. For people on warfarin (Coumadin) or other vitamin K-sensitive blood thinners, daily high-dose spinach juice can interfere with medication. This warrants a conversation with a prescriber before starting a regular spinach juice habit.