Fiber Intake Calculator
Calculate Fiber Needs
Find your recommended daily fiber and see your gap
g
Formula
Recommended Fiber: Men (19-50) = 38g, Men (51+) = 30g, Women (19-50) = 25g, Women (51+) = 21g
Frequently Asked Questions
How much fiber do I need per day?
Adult men need 30-38g per day, and adult women need 21-25g per day. Most Americans only get about 15g per day, roughly half the recommended amount.
What happens if I don't eat enough fiber?
Low fiber intake is associated with constipation, increased risk of heart disease, type 2 diabetes, and colorectal cancer. Fiber also helps with weight management by increasing satiety.
What is the difference between soluble and insoluble fiber?
Soluble fiber dissolves in water and forms a gel (oats, beans, apples) — it helps lower cholesterol and blood sugar. Insoluble fiber adds bulk to stool (whole wheat, vegetables, nuts) — it helps prevent constipation. Both types are important.
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