Fiber Calculator

Most people consume far less fiber than recommended, which affects digestive health, heart health, and blood sugar control. Enter your age, sex, and estimated current fiber intake to see your recommended target, how much you are falling short, and specific high-fiber food suggestions to bridge the gap.

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About fiber intake

The Academy of Nutrition and Dietetics recommends 14 grams of fiber per 1,000 calories consumed. Most adults in Western countries consume only about 15 grams per day, roughly half the recommended amount. Increasing fiber intake gradually and staying well hydrated is the safest approach. This tool provides general estimates and is not a substitute for personalised dietary advice from a registered dietitian.

Fiber Supplements

Psyllium husk, chia seeds, fiber supplements, and high-fiber recipe books.

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Frequently Asked Questions

How much fiber do adults need?
The Academy of Nutrition and Dietetics recommends 25g per day for women and 38g per day for men (14g per 1,000 calories consumed). After age 50, recommendations decrease to 21g for women and 30g for men. Most adults only consume about 15g per day.
What happens if I don't eat enough fiber?
Insufficient fiber is linked to constipation, poor gut health, higher cholesterol, unstable blood sugar, increased risk of colorectal cancer, and reduced satiety (leading to overeating). Fiber feeds beneficial gut bacteria that support immune function and mental health.
Should I increase fiber intake gradually?
Yes. Increasing fiber too quickly can cause bloating, gas, and discomfort. Add 3-5 grams per week and drink plenty of water. Your gut microbiome needs time to adapt to higher fiber intake.
What are the best sources of fiber?
Legumes (lentils, chickpeas, black beans): 12-15g per cup. Whole grains (oats, quinoa, brown rice): 3-8g per serving. Fruits (raspberries, pears, apples with skin): 4-8g each. Vegetables (broccoli, artichoke, Brussels sprouts): 4-10g per cup. Seeds (chia, flax): 5-10g per tablespoon.

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