Most adults need somewhere between 22 and 34 grams of fiber a day, depending on age and sex. This calculator finds your daily target, adds up what you ate today, and builds a gentle week-by-week plan to close the gap without the gas and bloating that come from adding too much too fast.
With calories entered, we use the Dietary Guidelines rule of 14 grams of fiber per 1,000 calories.
Tap + for each serving. Values come from the USDA nutrient database, rounded to the nearest half gram.
| Age | Women | Men |
|---|---|---|
| 19-30 | 28 g | 34 g |
| 31-50 | 25 g | 31 g |
| 51 and older | 22 g | 28 g |
These targets come from the Dietary Guidelines for Americans 2020-2025 and are based on 14 grams of fiber for every 1,000 calories. Cleveland Clinic notes that only about 5% of U.S. adults reach their fiber target, and most people get about 16 grams a day.
Hard stool leads to straining, and straining is one of the habits most often tied to hemorrhoids. Harvard Health notes that fiber supplements such as psyllium draw water into stool so it's easier to pass, and that this can reduce hemorrhoid bleeding, inflammation, and enlargement. MedlinePlus also lists eating more fiber from fruits, vegetables, and grains among the ways to prevent hard stools. If you want to check your stool form, try the Bristol Stool Chart checker.
Under the Dietary Guidelines, women need about 22 to 28 grams and men about 28 to 34 grams, depending on age. That works out to 14 grams per 1,000 calories you eat.
Slowly. Adding about 5 grams a week gives your gut time to adjust and helps you avoid gas, bloating, and cramping.
Fiber helps stool hold water so it's softer and easier to pass, which means less straining. Harvard Health notes fiber supplements can reduce hemorrhoid bleeding and inflammation. Talk to your doctor if symptoms don't improve.
Food is the best source, but a supplement can help if you can't get enough from your diet. Check with a healthcare professional before starting any supplement.
Sources: Cleveland Clinic, How much fiber per day (Dietary Guidelines for Americans 2020-2025 targets); Mayo Clinic, Chart of high-fiber foods (USDA National Nutrient Database values); Harvard Health, Help for hemorrhoids; MedlinePlus, Anal fissure. Last updated September 2026.