Lentils rank among the best plant-based sources of dietary fiber, but the grams you see on a label depend on whether you are eating them cooked, canned, or raw. This lentil fiber per 100g calculator converts your actual serving — grams, ounces, cups, or tablespoons — into a precise fiber total and compares it to the 28g daily value used on nutrition labels.
Use the form selector to choose cooked or dry lentils, enter your portion, and hit Calculate. The result shows the fiber content per 100g, the fiber in your exact serving, and what percent of your daily fiber target it covers. Meal planners, macro trackers, dietitians, and anyone increasing fiber intake can use the quick-fill presets and step-by-step breakdown to plan lentil-based meals with confidence.
How to Use This Tool
Select whether your lentils are cooked or raw/dry. Cooked lentils are roughly 70% water, so a 100g bowl of cooked lentils contains less fiber by weight than 100g of dry lentils. The calculator applies the correct fiber density for the form you choose, then converts your selected unit — grams, ounces, US cups, or tablespoons — into an equivalent weight before computing total fiber.
Enter your portion size manually or use the preset buttons for common servings such as 1 cup cooked or 50g dry. Press Calculate to see the fiber per 100g, the fiber in your actual serving, and the share of the 28g daily fiber target. Reset returns the form to a clean cooked-lentil, gram-based calculation.
Fiber Values Behind the Calculator
The values used here are based on USDA FoodData Central references for mature lentil seeds. Raw dry lentils average about 10.7g of fiber per 100g; cooked, boiled lentils average about 7.9g of fiber per 100g. Water absorbed during cooking dilutes the fiber concentration, which is why cooked lentils look lower on a per-100g basis even though very little fiber is actually lost.
| Lentil form | Fiber per 100g | 1 US cup | 1 tbsp |
|---|---|---|---|
| Cooked (boiled) | 7.9g | 198g | 12.4g |
| Raw / dry | 10.7g | 192g | 12g |
For detailed nutrient profiles, see USDA FoodData Central. The 28g daily value is the FDA's fiber reference for adults on a 2,000-calorie eating pattern; read the official explanation at FDA Daily Value guidance.
Worked Examples
1 cup cooked lentils: A US cup of cooked lentils weighs roughly 198g. Fiber = 198 × 7.9 ÷ 100 = 15.6g, which is about 56% of a 28g daily target.
50g dry lentils: Fiber = 50 × 10.7 ÷ 100 = 5.4g. Cooked, that same 50g of dry lentils still provides roughly 5.4g of fiber, just spread across a much heavier prepared portion.
4oz cooked lentils: 4oz = 113.4g. Fiber = 113.4 × 7.9 ÷ 100 = 9.0g. That's about one-third of the daily value.
Tips for a Higher-Fiber Lentil Routine
- If you're not used to legumes, increase lentil portions gradually over one to two weeks to let your gut bacteria adapt and reduce bloating.
- Rinse dry lentils and pick out any debris before cooking. A quick soak can shorten simmer time and may improve tolerance for sensitive stomachs.
- Use the cooking liquid in soups or sauces — a portion of soluble fiber can dissolve into the broth rather than staying in the lentil itself.
- Pair lentils with vegetables, fruit, oats, and nuts to easily reach 25–30g of fiber per day.
Precision Notes & Limitations
The calculator assumes average USDA values. Different lentil varieties — brown, green, red, yellow, black beluga — can vary by roughly 1g of fiber per 100g. Hulled red split lentils tend to have a little less fiber than whole green or brown lentils because the seed coat is removed. Canned lentils are close to the cooked value, but recipes that are heavily drained or rinsed may differ slightly.
If you have a medical condition that requires strict fiber counting, such as diverticulitis or IBS, use the nutrition panel on your specific brand or consult a registered dietitian rather than relying only on averages.
For other measurement help, try the bean fiber calculator to compare fiber in common beans, or the lentil vitamin C calculator if you're also tracking micronutrients in the same ingredient.
Frequently Asked Questions
Does cooking destroy lentil fiber? No. Fiber is largely heat-stable. The drop from 10.7g to 7.9g per 100g happens because lentils absorb water, not because fiber breaks down.
How much fiber should I eat per day? The FDA Daily Value is 28g on nutrition labels. Some older dietary guidelines used 25g for women and 38g for men; aiming for 25–35g is a reasonable general target.
Are red lentils lower in fiber? Red split lentils are often hulled, which removes part of the fibrous seed coat, so they can be about 1–2g lower per 100g than whole brown or green lentils. The values here are still a close estimate.
Can I use this for canned lentils? Yes, use the cooked value. Canned lentils are heat-processed in water, so their fiber density is similar to home-cooked lentils. Check label if you need exact numbers.
How does lentil fiber fit into net carbs? Fiber is an indigestible carbohydrate. For net-carb counting, subtract fiber from total carbs. One cup of cooked lentils has roughly 39.9g total carbs and 15.6g fiber, giving about 24g net carbs.