Prune and Prune Juice Fiber Calculator
Estimate how much fiber and approximate sorbitol you get from prunes or prune juice, including how much prune juice for constipation questions may miss: juice has much less fiber than whole prunes.
Daily result
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Daily result
— g fiber
- Sorbitol
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- Daily target covered
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- Fiber remaining
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Approximate composition values, not a treatment or a dose. Increase fiber gradually and drink more water alongside it.
Safety note. Larger amounts of sorbitol can cause cramping. Constipation lasting more than a week or two, or with blood, weight loss, vomiting or severe pain, needs a clinician.
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How much fiber is in prunes and prune juice?
If you are asking how much prune juice for constipation, remember that prune juice has much less fiber than whole prunes. Whole prunes provide about 7.1 g of fiber per 100 g, while canned prune juice provides about 1.0 g per 100 g.
Sorbitol is the sugar alcohol that draws water into the bowel and does much of the work people associate with prune juice. It is approximate: prunes provide about 6 g per 100 g, while a 240 mL glass of juice provides roughly 6–7 g.
Increase fiber gradually and raise water intake alongside it, or bloating and gas can get worse. Prunes are also high in sorbitol, which can cause cramping in larger amounts.
Fiber per day = serving amount × fiber per unit × servings per day This is a nutrition calculator, not a dosing tool, and it does not recommend a treatment amount. Under 18, ask a paediatrician instead. Constipation lasting more than a week or two, or with blood, weight loss, vomiting or severe pain, needs a clinician.
Prune and prune juice fiber FAQ
Does prune juice have more fiber than whole prunes?
No. Whole prunes have about 7.1 g of fiber per 100 g, while canned prune juice has about 1.0 g per 100 g. Juice may still contain approximate sorbitol, which is different from fiber.
How much fiber is in a glass of prune juice?
A 240 mL (1 cup, 8 fl oz) glass is about 2.6 g of fiber based on the supplied composition figures. The calculator adjusts that estimate for your serving.
Why does the calculator show a sorbitol range for juice?
The supplied reference describes prune juice sorbitol as roughly 6–7 g per 240 mL glass, so the result keeps that uncertainty visible instead of implying an exact number.
Can I use this for a child under 18?
No. The calculator does not output a serving result for anyone under 18. Ask a paediatrician because constipation in children needs different advice.
When should constipation be checked by a clinician?
Seek clinical advice when constipation lasts more than a week or two, or sooner if there is blood, weight loss, vomiting or severe pain.