Fiber Intake Calculator

Calculate recommended daily fiber intake by age and sex, plus food equivalents — see grams per day and per 1000 kcal.

Fiber Intake Calculator

Calculate recommended daily fiber intake by age and sex, plus food equivalents — see grams per day and per 1000 kcal.

Age

Sex

Daily calories (optional)

Enter values above and click Calculate — results will appear here with the formula explained.

AI 14g / 1000 kcal; or age/sex AI: M 34g (19-50), 28g (51+); F 28g (19-50), 22g (51+); plus 14g per 1000 kcal check

How does this work?

Adequate Intake for fiber is often 14g per 1000 kcal, or simplified age/sex values: men ~34g (19-50) and 28g (51+), women ~28g (19-50) and 22g (51+) per US AI. If you log calories, check against 14g/1000 kcal.

Fiber supports gut health and satiety. Increase gradually with water to avoid discomfort — this is general information, not medical advice.

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Disclaimer: Results are estimates for informational purposes only and do not constitute professional medical advice.

Quick Answer

Fiber Intake Calculator: Calculate recommended daily fiber intake by age and sex, plus food equivalents — see grams per day and per 1000 kcal. Formula: AI 14g / 1000 kcal. Example: At 30, male, 2200 kcal: age/sex AI 34g, and 14g/1000 kcal gives 30.

How to Use This Calculator

1Enter age, sex and optionally daily calories.
2Calculate to see recommended grams per day and per 1000 kcal check.
3Compare to intake: a slice whole wheat ~2g, apple ~4g, cup beans ~13g.

Formula Used

AI 14g / 1000 kcal; or age/sex AI: M 34g (19-50), 28g (51+); F 28g (19-50), 22g (51+); plus 14g per 1000 kcal check

Fiber supports gut health and satiety. Increase gradually with water to avoid discomfort — this is general information, not medical advice.

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Worked Example

At 30, male, 2200 kcal: age/sex AI 34g, and 14g/1000 kcal gives 30.8g — aim around 31-34g/day.

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Frequently Asked Questions

QSoluble vs insoluble?

Both count toward total. Soluble (oats, beans) helps cholesterol, insoluble (whole wheat) helps regularity.

QCan I eat too much fiber?

Very high intake can cause gas or reduce mineral absorption. Increase slowly and drink water.

QDo children need less?

Yes, AI is lower and scales with calories — this tool uses adult AI as baseline.

Formula Used

AI 14g / 1000 kcal; or age/sex AI: M 34g (19-50), 28g (51+); F 28g (19-50), 22g (51+); plus 14g per 1000 kcal check

Fiber supports gut health and satiety. Increase gradually with water to avoid discomfort — this is general information, not medical advice.

Frequently Asked Questions

QSoluble vs insoluble?

Both count toward total. Soluble (oats, beans) helps cholesterol, insoluble (whole wheat) helps regularity.

QCan I eat too much fiber?

Very high intake can cause gas or reduce mineral absorption. Increase slowly and drink water.

QDo children need less?

Yes, AI is lower and scales with calories — this tool uses adult AI as baseline.