Daily Fiber Calculator

Build your day. Hit 30g.

Guidelines: 25g for women, 38g for men — 30g is the USDA Daily Value and a practical shared target.

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About this fiber calculator

This calculator tracks your daily fiber intake in real time using USDA FoodData Central data for 2,494 foods. Search any food, add it to your day, and watch the fiber jar fill up as you log meals. The tool tracks total fiber, soluble fiber, insoluble fiber, and calories — all in a single view.

The 30g daily goal is the USDA Daily Value for dietary fiber, used as a general target for most adults. Women's guidelines call for 25g; men's guidelines call for 38g. You can switch targets using the goal buttons above the jar. Most Americans currently get only 10–15g per day, so even reaching 20–25g is a meaningful improvement for most people.

Unlike food diary apps, this tool focuses entirely on fiber — both the total and the breakdown between soluble and insoluble types. That distinction matters: soluble fiber slows digestion and feeds gut bacteria, while insoluble fiber keeps the digestive tract moving. Tracking both helps you understand the quality of your fiber intake, not just the quantity.

Frequently asked questions

How much fiber should I eat per day? +
The USDA recommends 25g/day for women and 38g/day for men, with 30g as a practical daily target for most adults. Most Americans only get 15g. Use the goal buttons above the jar to set your personal target.
What counts as a high-fiber food? +
Foods with 5g or more of fiber per serving are considered high-fiber. Good sources include legumes (lentils: 15g/cup), vegetables (artichoke: 10g), nuts, seeds, and whole grains. Legumes are the most fiber-dense common food group and the easiest way to close a large fiber gap.
What's the difference between soluble and insoluble fiber? +
Soluble fiber dissolves in water and forms a gel, slowing digestion and feeding beneficial gut bacteria. Found in oats, beans, apples, and chia seeds. Insoluble fiber adds bulk and speeds transit through the digestive tract. Found in wheat bran, vegetable skins, and whole grains. Both are important — aim for a mix of fiber sources.
How do I know if I'm getting enough fiber? +
Use this calculator to log your foods and see your daily total. Signs of too little fiber include constipation, blood sugar spikes after meals, and feeling hungry shortly after eating. Signs you're getting enough: regular digestion, sustained energy between meals, and a diverse gut microbiome over time.

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