Dietary Fiber Intake Calculator
Estimate daily fiber intake from food types, compared with the recommendation.
Input Data
Results
At a glance:Fiber grams = sum over food types (grams × per-100 g fiber factor). Recommended intake depends on sex and age group: adult male 30 g, adult female 25 g, child male 20 g, child female 18 g, elderly male 28 g, elderly female 22 g. Gap = total − recommended.
Formula
fiber = grains×2.5% + vegetables×2.5% + fruit×2% + legumes×7% + nuts×6% + other×2%.
recommended by sex and age; gap = total − recommended.
How to Use
- Select sex and age group, then enter grams of each food type.
- The tool sums fiber and compares with the recommendation.
Case Studies
Adult female: grains 200, vegetables 250, fruit 150, legumes 50, nuts 20, other 200
fiber ≈ 200×0.025 + 250×0.025 + 150×0.02 + 50×0.07 + 20×0.06 + 200×0.02 = 5+6.25+3+3.5+1.2+4 = 22.95 g.
recommended 25 g; gap ≈ −2.05 g, slightly short.
FAQ
What fiber factors are used?
Approximate per-100 g fiber: grains 2.5%, vegetables 2.5%, fruit 2%, legumes 7%, nuts 6%, other 2%. These are rough averages.
What are the recommendations based on?
Age- and sex-specific intake references; adult males ~30 g/day, adult females ~25 g/day.
What if I eat too much fiber?
Too much at once may cause bloating; increase gradually and drink enough water.
Is this a substitute for a dietitian?
No. It is an estimate from food types; for precise nutrition advice consult a professional.
Why track fiber?
Adequate fiber supports bowel regularity and blood sugar and cholesterol control.
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References
Content review: Calculatorism Science Team. Results are for reference only; please refer to the relevant authorities for the official figures.