How much dietary fiber is actually in your beans? This Beans Fiber Per 100g Calculator gives you the answer in seconds. Just pick the type of bean from the dropdown — or enter your own fiber value — adjust the serving size, and see exactly how many grams of fiber you're getting per 100 grams, per serving, and per cooked cup.
Beans are among the richest plant sources of fiber, but values vary widely: soybeans deliver around 9g per 100g cooked, while green beans only provide about 2.7g. This tool helps anyone tracking macronutrients, meal prepping, or managing digestive health compare beans accurately and plan portions with confidence.
Whether you're a dietitian building a meal plan, a fitness enthusiast counting daily fiber, or simply curious about your pantry staples, this calculator provides clear breakdowns and easy presets. No more guessing — get precise fiber numbers for any bean, any portion.
🥜 Fiber in Beans Calculator
Step-by-Step Guide
Using the calculator is straightforward. Start by selecting a bean type from the dropdown — the fiber value per 100g will populate automatically. If your bean isn't listed or you have package data, enter the fiber manually. Then type your serving size and pick the unit (grams or ounces). Click Calculate Fiber to see your serving's fiber content, the per-100g baseline, the amount in a typical cooked cup, and the percentage of the recommended daily 28g fiber target.
For quick comparisons, the preset buttons below the inputs instantly fill common beans like black beans, chickpeas, navy beans, and green beans. Use the reset button to start over, or the copy button to save your result to the clipboard for meal logs or notes.
How the Fiber Calculation Works
The math is simple but important for meal planning. Every bean value is expressed as grams of dietary fiber per 100 grams of cooked beans — the standard used by national food databases like the USDA FoodData Central and the FAO. To calculate fiber in your serving, the calculator uses:
Fiber in serving = (Fiber per 100g ÷ 100) × Serving weight in grams
So if you eat 150g of black beans with 7.5g fiber per 100g, the result is (7.5 ÷ 100) × 150 = 11.25g of fiber. The calculator also converts ounces to grams using 1 oz = 28.3495g, which matters because many canned bean labels list nutrition per ½ cup or per 130g, while recipes often call for ounces.
The daily percentage uses 28g of fiber per day as a general adult target, in line with the Dietary Guidelines for Americans. This is a guideline, not a prescription; your personal target may be higher or lower depending on calorie needs, age, and health conditions.
Fiber Content Reference Table
The values below reflect cooked (boiled) beans without salt, based on USDA FoodData Central. Dried beans always have much higher fiber per 100g because they contain far less water — for example, raw black beans have about 15–16g per 100g, but nobody eats them raw. Always compare cooked-to-cooked or canned-to-canned.
| Bean (cooked, boiled) | Fiber per 100g | Fiber per ½ cup (~88g) |
|---|---|---|
| Soybeans | 9.0 g | 7.9 g |
| Navy beans | 8.6 g | 7.6 g |
| White beans | 8.3 g | 7.3 g |
| Adzuki beans | 8.2 g | 7.2 g |
| Kidney beans | 7.6 g | 6.7 g |
| Black beans | 7.5 g | 6.6 g |
| Pinto beans | 7.0 g | 6.2 g |
| Chickpeas | 6.8 g | 6.0 g |
| Lentils | 4.6 g | 4.0 g |
| Green beans | 2.7 g | 2.4 g |
Worked Example: Meal Prep for the Week
Scenario: You're meal-prepping high-fiber lunches and want to know if one can of black beans covers your fiber goal. A standard can of black beans (15 oz) contains about 260g of cooked beans when drained.
Calculation: 7.5g per 100g × 260g ÷ 100 = 19.5g fiber per can. Split across 3 lunches, each serving gives 6.5g — about 23% of the daily 28g target.
Now compare with chickpeas: 6.8g per 100g × 260g ÷ 100 = 17.7g per can. The difference matters if you meal prep the same recipe weekly.
Common Mistakes to Avoid
- Using dry weight. Raw beans have roughly double the fiber per 100g because they lose water when cooked. If you input a dry-bean value for cooked portions, your result will be overstated by almost half.
- Confusing drained vs. canned-weight. The liquid in canned beans accounts for 20–30% of the can's weight and contains little fiber. Always weigh beans after draining.
- Mixing up cup sizes. Cooked bean calories and fiber references often use ½-cup servings. This calculator uses 177g as one cooked cup — close to the USDA's 177g for most beans, though individual varieties vary by a few grams.
- Ignoring added ingredients. Fiber is unaffected by oil, sauces, or salt, but the total serving calories will change — this tool only measures the bean portion.
Frequently Asked Questions
How much fiber should I eat per day? The Dietary Guidelines for Americans recommend 14g of fiber per 1,000 calories, which is about 28g for a 2,000-calorie diet. Many adults fall short; swapping a low-fiber side for beans is one of the easiest ways to close the gap.
Are canned beans lower in fiber than boiled? Not significantly. Both are cooked, and fiber is not destroyed by canning or heat. Canned beans often have added sodium, so rinse them if you're watching salt, but the fiber grams stay nearly identical.
Do different brands vary? Fiber is a structural carbohydrate in the bean itself, so brand-to-brand differences are usually less than 1g per 100g. If your brand's label shows a different value, enter it manually and the calculator adjusts automatically.
Should I count fiber in my net carbs? If you're tracking net carbohydrates, fiber is not digested and typically gets subtracted from total carbs. People following low-carb diets often use bean calculators in conjunction with carb data. For keto-style diets, many find lentils and low-fiber beans like green beans to be easier fits.
Pro tip: Keep a food scale near your kitchen and weigh beans in grams while meal prepping. It's far more accurate than measuring cups, especially for fibrous foods that settle differently in a cup.