Fiber Intake Calculator
Find your daily fiber target using the Institute of Medicine adequate intake by age and sex, or 14 grams per 1,000 calories. Example: a 35-year-old woman eating 2,000 calories should aim for 25 to 28 g of fiber a day.
Show steps
How to use the Fiber Intake Calculator
- Enter the values in the fields.
- Press Calculate to see the result with the steps shown.
Formula and method
Adequate intake (IOM): men 38 g and women 25 g up to age 50, men 30 g and women 21 g at 51+. Alternative: 14 g of fiber per 1,000 kcal.
Fiber adequate intake by age (IOM)
| Age | Male | Female |
|---|---|---|
| 1 to 3 | 19 g | 19 g |
| 4 to 8 | 25 g | 25 g |
| 9 to 13 | 31 g | 26 g |
| 14 to 18 | 38 g | 26 g |
| 19 to 50 | 38 g | 25 g |
| 51+ | 30 g | 21 g |
High-fiber foods
| Food | Fiber (g) |
|---|---|
| Lentils, 1/2 cup cooked | 8 |
| Raspberries, 1 cup | 8 |
| Black beans, 1/2 cup | 7.5 |
| Oats, 1 cup cooked | 4 |
| Apple with skin, medium | 4.5 |
| Almonds, 1 oz | 3.5 |
Benefits
Fiber supports regularity, steadier blood sugar, lower LDL cholesterol and a healthier gut microbiome.
Cautions
This calculator is for education and is not medical advice. Decisions about testing and treatment belong with a qualified clinician.
Frequently asked questions
How much fiber do I need daily?
About 25 g for women and 38 g for men under 50.
What is 14 g per 1000 calories?
An alternative calorie-based target.
Can I eat too much fiber?
Very large amounts can cause bloating and block mineral absorption.
Soluble or insoluble?
Both are useful.
How to increase fiber?
Add beans, whole grains, fruit and vegetables gradually.
Do supplements count?
Food is preferred.
Sources
- Institute of Medicine: Dietary Reference Intakes for Energy, Carbohydrate, Fiber
- Dietary Guidelines for Americans
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