In this article
- Do green beans have fiber in every form?
- Are green beans high in fiber?
- Myth vs fact: are green beans really beans?
- How green beans compare with other vegetables
- What green bean fiber does for you
- Beyond fiber: what a cup of green beans brings
- Fresh, frozen or canned?
- Easy ways to eat more green beans
- A quick rule for choosing green beans
- Green bean fiber: quick answers
- Sources
Do green beans have fiber? Yes, and the surprise is in the cooking: a cup of cooked green beans usually gives you more than a cup of raw ones. USDA lists a cup of microwaved frozen green beans at about 3.8 grams, compared with 2.7 grams for a cup of raw pieces.
Cooking doesn’t create fiber. The beans soften and pack down, so more of them fit in the same cup.
Below you’ll find how green beans stack up by form, how they compare with dried beans and other vegetables, what else they bring, and which kind to buy.
Do green beans have fiber in every form?
They do, though the numbers shift depending on how they’re packed and cooked. Here’s what USDA FoodData Central lists:
| Green beans | Serving | Fiber | Calories |
|---|---|---|---|
| Raw, 1/2 inch pieces | 1 cup (100 g) | 2.7 g | 31 |
| Raw | 10 beans, 4 inch (55 g) | 1.5 g | 17 |
| Frozen, unprepared | 1 cup (121 g) | 3.1 g | 40 |
| Frozen, microwaved | 1 cup (111 g) | 3.8 g | 37 |
| Canned, drained | 1 cup (135 g) | 2.6 g | 28 |
| Yellow wax beans, raw | 1 cup (100 g) | 3.4 g | 31 |
Every form lands between about 2.5 and 4 grams per cup. That’s roughly 9% to 14% of the 28 gram Daily Value, for 40 calories or less.
Why the cooked cup comes out ahead
Per 100 grams, raw green beans have 2.7 grams of fiber and microwaved frozen green beans have 3.4. Cooked beans likely lose a little water, so each gram of bean carries slightly more fiber.
The cup measure exaggerates that effect. A cup of raw half inch pieces holds loosely packed, crisp beans, while cooked beans pack in tighter.
Yellow wax beans, the paler cousin, edge out green ones with 3.4 grams per 100 grams raw. If you see both at the market, either one is a good pick. Yellow beans also carry a bit more vitamin C, about 16 milligrams per 100 grams versus 12 for green.
Are green beans high in fiber?
Not by the numbers. A cup covers around a tenth of your daily target, which makes green beans a moderate source.
Their strength is the calorie side. Raw green beans give you about 8.7 grams of fiber per 100 calories, and microwaved frozen ones about 10.
That makes green beans an easy way to bulk up a plate. A generous two cup serving of cooked green beans adds about 7.6 grams of fiber for under 80 calories.
Myth vs fact: are green beans really beans?
Myth: Green beans count as beans, so they should have as much fiber as black or navy beans.
Fact: Green beans come from a legume plant, but you eat them as young pods, and their fiber is in a different league. Harvard’s Nutrition Source explains that the word legume covers the whole plant, including its pods, while pulses are the dried seeds such as beans, lentils and peas.
That difference shows up clearly in the numbers:
| Food | Serving | Fiber | Calories |
|---|---|---|---|
| Navy beans, cooked | 1/2 cup | 9.6 g | 128 |
| Pinto beans, cooked | 1/2 cup | 7.7 g | 123 |
| Black beans, cooked | 1/2 cup | 7.5 g | 114 |
| Kidney beans, cooked | 1/2 cup | 5.7 g | 113 |
| Green beans, frozen, microwaved | 1 cup | 3.8 g | 37 |
A half cup of navy beans has more than twice the fiber of a full cup of green beans. The trade off is calories: the navy beans come with more than three times as many.
Green beans behave like a vegetable on your plate, so it makes sense to treat them as one. Pair them with dried beans or lentils when you want a big fiber meal.
How green beans compare with other vegetables
Among vegetables, green beans sit in the middle. Here’s a cup of cooked green beans next to cooked vegetables from the Dietary Guidelines list of fiber sources:
| Cooked vegetable, 1 cup | Fiber | Calories |
|---|---|---|
| Green peas | 8.8 g | 134 |
| Brussels sprouts | 6.4 g | 65 |
| Broccoli | 5.2 g | 54 |
| Collard greens | 4.8 g | 63 |
| Carrots | 4.8 g | 54 |
| Corn | 4.0 g | 134 |
| Green beans, frozen, microwaved (USDA) | 3.8 g | 37 |
Green beans have the fewest calories on this list by a wide margin. Broccoli and Brussels sprouts give you more fiber per cup, while corn and peas bring more fiber but far more calories.
The calorie gap matters if you’re trying to fill up without overdoing it. Two cups of cooked green beans have fewer calories than one cup of cooked corn and more fiber than a cup of cooked broccoli, about 7.6 grams versus 5.2.
Not sure how many grams you need in a day? Our fiber calculator gives you a personal target in a few seconds.
What green bean fiber does for you
Cleveland Clinic dietitian Lara Whitson describes green beans as a source of soluble fiber that helps lower LDL cholesterol. She says it acts like a sponge, soaking up cholesterol in your colon before it can reach your blood.
Fiber also helps soften stool so it’s easier to pass, Whitson notes, and it helps keep your gut microbiome balanced. High fiber vegetables like green beans are slower to digest, so they can help you stay full longer.
If you’re working on digestion, our gut health guides show you how to add fiber gradually and comfortably.
Beyond fiber: what a cup of green beans brings
A cup of raw green beans, about 100 grams, provides the following according to USDA, with % Daily Value from the FDA:
- Vitamin K: about 43 micrograms, 36% of the Daily Value.
- Vitamin C: about 12 milligrams, 14%.
- Folate: about 33 micrograms, 8%.
- Potassium: about 211 milligrams, 4%.
- Protein: about 1.8 grams.
Whitson adds that green beans have a high amount of vitamin C. They won’t necessarily keep colds away, but that vitamin C helps your immune system work more efficiently.
Their folate and potassium may also support heart health, she notes, alongside the cholesterol effect of their fiber.
Vitamin K is the standout. Whitson notes that green beans are an excellent source, and that studies link low vitamin K intake with poorer bone health.
Ten raw green beans, about 55 grams, carry around 24 micrograms of vitamin K, about a fifth of your daily needs, plus 1.5 grams of fiber.
Green beans are also about 90% water, so they add volume to a meal without adding much energy.
Fresh, frozen or canned?
Cleveland Clinic says frozen green beans can be just as healthy as fresh, because they’re usually frozen soon after harvest. Canned green beans have a similar nutrient content too, according to Whitson.
The difference with canned is salt. USDA lists a cup of regular canned, drained green beans at about 362 milligrams of sodium, around 16% of the Daily Value, compared with almost none in fresh or frozen.
A whole standard can of drained green beans, about 262 grams, holds roughly 5 grams of fiber and about 702 milligrams of sodium. That’s nearly a third of the daily sodium limit in one side dish if you eat the whole can.
Whitson’s fix is simple: choose low sodium cans, or rinse canned green beans before cooking to wash away some of the added salt.
Easy ways to eat more green beans
Whitson suggests a few quick methods for frozen green beans: microwave them with a splash of water until hot but still firm, roast them with olive oil and seasonings, or saute them with olive oil and diced onion or herbs.
Canned green beans are already soft, so they work best warmed in the microwave or added to a stir fry or soup. A few more ideas:
- Toss roasted green beans with toasted almonds for extra fiber and crunch.
- Add a cup of chopped green beans to minestrone or vegetable soup.
- Mix green beans with chickpeas and a lemony dressing for a high fiber salad.
- Serve green beans next to a bean or lentil dish to round out the plate.
- Stir chopped green beans into a whole grain pilaf or a vegetable fried rice.
Looking for more simple vegetable sides and mains? Our recipe eBooks are packed with easy, high-fiber recipes.
A quick rule for choosing green beans
All forms give you useful fiber, so pick based on what matters most to you:
- If you want the most fiber per cup, cook frozen green beans. A microwaved cup gives you about 3.8 grams.
- If you want the least sodium, choose fresh or frozen, which have almost none.
- If convenience wins, buy canned, but pick low sodium or rinse them first.
- If you want a full fiber meal, pair a cup of green beans with half a cup of black, pinto or navy beans for roughly 10 to 13 grams.
Whichever form you pick, eating them often matters more than the exact choice. A cup of green beans with dinner every night adds roughly 19 to 27 grams of fiber over a week, depending on the form, for well under 300 calories in total.
Green bean fiber: quick answers
Are green beans high in fiber?
They’re a moderate source. A cup has about 2.6 to 3.8 grams depending on the form, roughly 9% to 14% of the Daily Value, for under 40 calories.
How much fiber is in a cup of green beans?
About 2.7 grams in a cup of raw pieces and about 3.8 grams in a cup of microwaved frozen green beans, according to USDA.
Do canned green beans have fiber?
Yes. A cup of canned, drained green beans has about 2.6 grams of fiber, but also about 362 milligrams of sodium unless you choose a low sodium can or rinse them.
Are green beans a legume or a vegetable?
Botanically they come from a legume plant, but you eat them as young pods. Nutritionally they act like a vegetable, with far less fiber than dried beans.
Do green beans have more fiber than dried beans?
No. Half a cup of cooked navy beans has 9.6 grams of fiber, more than twice what a full cup of green beans provides.
Does cooking green beans change their fiber?
Cooking doesn’t add fiber, but cooked green beans shrink, so a cup holds more of them. That’s why a cooked cup can have more fiber than a raw cup.
What foods are high in fiber to eat with green beans?
Lentils, chickpeas, black beans and whole grains pair well. Adding half a cup of black, pinto or navy beans to a cup of green beans gives you roughly 10 to 13 grams of fiber.
Sources
- U.S. Department of Agriculture, Agricultural Research Service. “Beans, snap, green, raw (169961); frozen, unprepared (169962); frozen, microwaved (169964); canned, regular pack, drained solids (169143); Beans, snap, yellow, raw (169320).” FoodData Central, SR Legacy. 2019. fdc.nal.usda.gov
- U.S. Department of Agriculture and U.S. Department of Health and Human Services. “Food Sources of Dietary Fiber.” Dietary Guidelines for Americans, 2020 to 2025. dietaryguidelines.gov
- U.S. Food and Drug Administration. “Daily Value on the Nutrition and Supplement Facts Labels.” 2026. www.fda.gov
- Cleveland Clinic. “The Health Benefits of Green Beans.” 2023. health.clevelandclinic.org
- Harvard T.H. Chan School of Public Health. “Legumes and Pulses.” The Nutrition Source. 2024. nutritionsource.hsph.harvard.edu
