FIBER INTAKE
CALCULATOR
Find your daily fiber target based on age, sex, and calorie intake.
Your Details
Your Fiber Target
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grams fiber / day
IOM Recommendation--
Calorie-Based Target--
Soluble Fiber Target--
Insoluble Fiber Target--
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Fiber Intake Guidelines
Related Articles
Why Fiber Is Essential
Dietary fiber supports digestive health, feeds beneficial gut bacteria (prebiotics), lowers LDL cholesterol (soluble fiber), stabilizes blood glucose, and promotes satiety. Higher fiber intakes are consistently associated with lower risk of cardiovascular disease, type 2 diabetes, colorectal cancer, and all-cause mortality. Most adults consume only 15–17g of fiber daily — roughly half the recommended intake.
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Built by Ren Martin
Sports coach · 20+ years in fitness · Used this calculator personally
Frequently Asked Questions
How much fiber should I eat per day?
The Institute of Medicine recommends 38g/day for men under 50 and 25g/day for women under 50. After 50, targets drop to 30g (men) and 21g (women). Many nutrition guidelines use 14g per 1,000 calories as a practical target.
Why is fiber important beyond digestion?
Dietary fiber has benefits that extend well beyond digestive health. Soluble fiber feeds beneficial gut bacteria (acting as a prebiotic), which produce short-chain fatty acids that reduce inflammation and support immune function. Adequate fiber intake is independently associated with reduced risk of colorectal cancer, type 2 diabetes, and cardiovascular disease. The Institute of Medicine's 25–38g daily recommendation reflects this broader evidence base.
Can I eat too much fiber?
For most people, fiber intake is far below recommended levels — average intake in many Western countries is 12–15g/day against a recommended 25–38g/day. Very high fiber intake (above 70g/day) can impair mineral absorption and cause digestive discomfort. Increase fiber intake gradually to avoid bloating and gas, and drink adequate water since fiber requires hydration to function optimally.
What are the best high-fiber foods?
Top sources include legumes (lentils, black beans, chickpeas), whole grains (oats, barley, quinoa), vegetables (broccoli, carrots, artichokes), fruits (berries, pears, apples with skin), nuts, and seeds. Aim to meet fiber targets through whole food sources rather than supplements when possible.