Kale
Juice

One pound of kale (approximately 454g) yields roughly 250–295ml in a masticating juicer — about 8.5–10 oz, or just under a standard glass. A centrifugal juicer extracts significantly less: typically 135–205ml from the same pound, which can mean less than half a cup.

Kale is one of the lower-yielding juicing vegetables precisely because it's so dense in solids and fiber. That's also why the juice is so nutritionally concentrated — everything that went into the leaf ends up in a smaller volume of liquid.

One standard bunch of kale (typically 340–450g / 12–16 oz) yields roughly one cup (8 oz) of juice in a masticating juicer. You'll need closer to two bunches if you're using a centrifugal juicer, which extracts 30–50% less from leafy greens.

Bunch weights vary significantly by variety and store. Curly kale and lacinato (dinosaur) kale both juice well; curly kale tends to yield slightly more juice due to higher water content. If you're buying by weight rather than bunch, plan on 400–450g per 8 oz serving in a masticating juicer.

If you're juicing 8 oz per day for seven days, you need about 56 oz (1,650ml) total. In a masticating juicer, that requires roughly 2.8–3 kg (6–6.5 lbs) of fresh kale — about 7–8 standard bunches.

Centrifugal juicers need considerably more: plan on 4–5 kg (9–11 lbs) to hit the same weekly volume, which makes the cost difference between juicer types very apparent when kale is a daily staple.

For a specific batch size, use the calculator to dial in exact quantities by juicer type.

Several factors compound with kale more than with denser vegetables. First, freshness matters enormously — wilted kale contains significantly less water and juices poorly. Buy kale as close to juicing day as possible and store it unwashed in a bag with a paper towel.

Second, technique: kale extracts better when rolled tightly and sandwiched between juicier produce like cucumber or apple. Feeding it loose through a centrifugal juicer is the fastest way to cut your yield in half. Third, variety — lacinato (dinosaur) kale is denser and yields somewhat differently than curly kale. Finally, stem content matters; the stems contain water but can be fibrous and hard to extract efficiently, especially in centrifugal juicers.

More than for most produce. Controlled trials comparing centrifugal and masticating kale juice found that centrifugal juice lost 63% of its lutein content within 30 minutes at room temperature, while masticating retained 89%. The high-speed oxidation that centrifugal juicers introduce is particularly damaging to kale's fragile phytonutrients — lutein, zeaxanthin, and sulforaphane precursors.

Vitamin C is also affected: masticating kale juice retains 80–95% of the raw kale's vitamin C content, while centrifugal can lose 15–30% during extraction. Given that kale juice already delivers exceptional vitamin C (around 130mg per 100ml from a masticating juicer), the slow-juicer advantage translates to a meaningful nutritional difference.

This is the most important safety consideration for kale juice. A 100ml serving of kale juice contains approximately 650mcg of vitamin K — more than 500% of the daily adequate intake. Vitamin K directly affects blood clotting, and high, variable intake can interfere with warfarin (Coumadin) and other vitamin K antagonist anticoagulants.

If you take blood thinners, this doesn't necessarily mean you can't drink kale juice — but consistency is critical. Your clinician will typically advise keeping vitamin K intake stable day to day rather than eliminating it entirely. A small, fixed daily amount of kale juice is safer than large irregular quantities. Always consult your prescribing physician before adding kale juice to a daily routine if you're anticoagulated.

No — kale is one of the lowest-sugar juicing vegetables. Kale juice contains approximately 1.7g of sugar per 100ml, compared to around 9g for carrot juice and 10g for orange juice. The modest carbohydrate content (about 7g per 100ml) means kale juice has minimal glycemic impact.

This makes it one of the best base juices for people managing blood sugar, though the trade-off is an assertively bitter, grassy flavor that most people balance with apple, cucumber, lemon, or ginger.

On its own, pure kale juice is intensely grassy, slightly bitter, and earthy — enjoyable if you've developed a taste for it, confronting if you haven't. The flavor softens considerably with lemon or ginger, which cut the bitterness. Cucumber juice dilutes it while adding volume and a fresh flavor. Ginger juice adds heat that complements kale's earthiness well. Apple or pear adds sweetness without overwhelming it.

A practical starting blend: 200g kale, 200g cucumber, 1 lemon (peeled), and a thumb of ginger. It produces about 12–14 oz of juice that's palatable even for people who don't love straight kale juice.

Leaves only is the standard recommendation, but it's more nuanced than that. The large central stems of mature curly kale are fibrous and extract poorly — they add volume to the feed chute without contributing much juice, and can clog some masticating juicers. Removing the main stem and feeding just the leaf gives you better yield and less strain on the machine.

Baby kale and lacinato kale have thinner, more tender stems that juice reasonably well and don't need trimming. No peeling is needed for any variety — the skin is where most of the nutrients are, and it juices cleanly.

Masticating or twin gear kale juice keeps 48–72 hours in a sealed glass jar with minimal quality loss. The key is filling the container as full as possible to minimize air contact and using glass rather than plastic. Store it at the back of the fridge where temperature is most stable.

Centrifugal kale juice degrades faster due to the oxidation introduced during extraction — drink it within 24 hours for best nutrition. If you're batch-juicing for the week, masticating or twin gear is the only practical option.