Daily Fiber Calculator
Calculate your recommended daily fiber intake in grams based on age, gender, and optionally daily calorie intake.
years
kcal
Optional — provides an additional calorie-based estimate
Recommended Daily Fiber
25g
| Age Group | Women | Men |
|---|---|---|
| 1-18 years | Age + 5 grams | |
| 19-50 years | 25g | 38g |
| 51+ years | 21g | 30g |
How Much Fiber Do You Need?
Enter your age and gender to get a recommended daily fiber intake based on standard dietary guidelines. If you know your typical daily calorie intake, you can also enter it for a second, calorie-based estimate using the common guideline of about 14 grams of fiber per 1,000 calories consumed.
Reference Table
The table above shows the general adult and adolescent fiber guidelines used by this calculator. Recommendations are slightly lower for adults over 50, reflecting typically lower calorie needs.
Example
A 35-year-old woman is recommended 25g of fiber per day. A 60-year-old man is recommended 30g per day. If that same man reports eating 2,400 calories a day, the calorie-based estimate would be (2,400 ÷ 1,000) × 14 ≈ 34g.
Common Use Cases
- Checking whether your current diet is meeting general fiber recommendations.
- Planning meals with enough fruits, vegetables, whole grains, and legumes.
- Understanding how fiber needs change with age.
FAQs
Is this personalized medical advice?
No — this calculator provides a general dietary guideline based on age and gender, not personalized medical advice. Individual fiber needs vary based on overall diet, digestive health, activity level, and other health conditions. Talk to a doctor or registered dietitian for guidance specific to you.
What foods are good sources of fiber?
Whole grains, legumes (beans, lentils), fruits (especially with the skin on), vegetables, nuts, and seeds are all good sources of dietary fiber.
Can I eat too much fiber?
Increasing fiber intake very quickly can cause bloating, gas, or digestive discomfort for some people. It's generally recommended to increase fiber gradually and drink plenty of water alongside it.