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Daily Fiber Target Calculator

Enter your age, sex, and daily calories to see your recommended fiber target.

How it is calculated

Two numbers are produced. The recommended value is a lookup by sex and age: for men 38 g up to and including age 50 and 30 g above 50; for women 25 g up to 50 and 21 g above 50. The calorie-based value is calories ÷ 1000 × 14 grams. The difference is recommended − calorie-based, shown to two decimals: positive means the age and sex figure is higher than the calorie estimate, negative means lower. Fiber is in grams per day. The table holds adult values only, so an age under 19 (or above 130) and zero or negative calories give no result. A blank sex is treated as female; any value other than male or female gives no result. Pregnancy and breastfeeding are not covered, and other countries publish different targets.

Worked example

A 35-year-old man eating 2600 kcal a day. Age 35 is at or below 50, so the recommended value is 38 g. Calorie-based: 2600 ÷ 1000 × 14 = 36.4, shown as 36 g. Difference = 38 − 36.4 = 1.60 g. His 14 g per 1,000 kcal estimate lands slightly under the age and sex figure, so the age-based 38 g is the stricter target.

Try this example →

Common mistakes

  • Leaving sex unselected and expecting a neutral answer. A blank value is treated as female, so a 35-year-old man with 2600 kcal who skips it sees 25 g instead of 38 g and a difference of -11.40 g.
  • Entering a child's age. The tool has adult values only and shows no result under 19, so do not use it for a teenager's or child's diet.
  • Reading the difference sign backwards. The value is recommended minus calorie-based, so −4.20 g means the calorie estimate is higher than the age and sex figure, not that you are 4 g short.
  • Entering kilojoules or the calories of one meal. The box expects daily kcal, and the calorie-based estimate scales directly with it.
  • Treating 14 g per 1,000 kcal as a limit. It is a rule of thumb, and the two numbers can differ by several grams, mostly at very low or very high calorie intakes.

Sources

About this calculator

Your recommended daily fiber intake follows official dietary reference guidance — in the U.S., the Institute of Medicine sets Adequate Intake at roughly 25g/day for women and 38g/day for men under age 50 (dropping slightly for older adults), figures also commonly cross-checked against a calorie-based rule of thumb of about 14g of fiber per 1,000 calories consumed, a shortcut that scales the target to someone's actual energy needs rather than using a single flat number for everyone.

Dietitians and nutrition-focused health apps use fiber targets because most people in Western diets fall well short of these numbers — average intake in the U.S. is often cited around 15g/day — despite fiber's well-documented roles in digestive regularity, feeding beneficial gut bacteria, blunting post-meal blood sugar spikes, and lowering LDL cholesterol, which is why fiber tracking is a common component of both general healthy-eating guidance and specific plans for managing diabetes or cardiovascular risk.

Age, sex and daily calories give your fiber target from the official adult guidance (19 and over; younger ages get no result), next to the 14 g per 1,000 kcal estimate for comparison.

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