Cooked Beans Calories & Nutrition Calculator

Cooked common beans (*Phaseolus vulgaris*) range from 115 to 149 calories per 100 grams depending on the variety ^[1]. Red kidney beans clock in at 127 kcal, black beans at 132 kcal, pinto beans at 143 kcal, and navy beans at 140 kcal. Great northern beans sit at the lighter end with just 118 kcal per 100g, while pink beans are the densest at 149 kcal.

Why such variation? It comes down to starch and fiber ratios. Pinto and pink beans pack more total carbohydrate per gram of dry weight, which survives hydration and cooking. Navy beans, despite their higher calorie count, carry 10.5g of fiber per 100g — the highest among common beans — meaning a significant portion of their carbohydrate energy passes through the digestive tract unabsorbed ^[2].

Canning changes the picture. Draining and rinsing canned kidney beans drops the energy to roughly 110 kcal per 100g, a 13% reduction compared to home-cooked beans, because water-soluble starches leach into the brine ^[7]. Refried beans prepared with lard or oil, however, gain calories from added fat — reaching 89 kcal per 100g for traditional recipes, with a higher fat-to-protein ratio than any boiled variety.

An important detail many nutrition trackers miss: dried beans contain roughly 330–340 kcal per 100g, but after soaking and boiling they absorb 2–2.5× their weight in water, diluting the calorie density by more than half ^[3]. Always log beans as cooked weight, not dry weight, to avoid drastically overestimating your intake.

Common beans deliver 6.8 to 9.7g of protein per 100g cooked, placing them among the most protein-dense plant foods available ^[1]. Cannellini beans lead the group at 9.73g/100g, followed closely by cranberry beans at 9.34g and pinto beans at 9.01g. A single 1-cup serving of cooked kidney beans provides roughly 15.3g of protein — comparable to two large eggs.

Bean protein is rich in lysine, an essential amino acid that cereals lack, but relatively low in methionine and cysteine (sulfur-containing amino acids) ^[2]. This complementary relationship is why cultures worldwide independently developed grain-and-bean pairings: rice and beans in Latin America, injera and lentils in Ethiopia, and roti and rajma in South Asia. Eaten together within the same day, the two foods supply all nine essential amino acids.

Cooking profoundly improves bean protein quality. Raw beans contain protease inhibitors (trypsin and chymotrypsin inhibitors) that block digestive enzymes, reducing protein utilization ^[5]. Boiling for 30 minutes or more inactivates the majority of these inhibitors, while pressure cooking eliminates nearly all of them ^[5]. Fermentation — used in traditional preparations such as African dawadawa or Latin American tempeh-style fermented beans — further increases protein digestibility by approximately 8–10% compared to boiling alone ^[5].

A 2024 analysis of NHANES data found that adults consuming dietary patterns rich in beans had significantly higher daily protein intakes and greater intake of shortfall nutrients including folate, iron, and magnesium compared to non-bean consumers ^[3].

Common beans are among the best plant sources of iron (1.77–3.70 mg/100g cooked) and zinc (0.76–1.38 mg/100g cooked), but not all of those minerals reach your bloodstream ^[1]. The key question is not how much iron beans contain, but how much your body can actually absorb — a concept called bioaccessibility.

During boiling, 77–91% of iron and 41–84% of zinc remain in the cooked grain ^[9]. The rest migrates into the cooking liquid. Research on common bean varieties grown in Rwanda found that cooking without discarding the soaking water and broth resulted in greater overall mineral retention ^[4]. The practical takeaway: consume the broth whenever possible, whether in soups, stews, or by cooking rice in bean liquid.

Phytic acid — the primary storage form of phosphorus in seeds — binds iron and zinc into insoluble complexes that resist digestion ^[4]. Soaking reduces phytic acid only marginally, but boiling degrades it significantly: reductions of 29–51% have been documented depending on variety and cooking duration ^[4]. Pressure cooking goes further, achieving the highest mineral bioaccessibility values for iron (7.79%) and copper (8.50%) compared to ordinary boiling ^[9].

Canned beans present a tradeoff. Draining removes 40–50% of added sodium, which is beneficial, but it also washes away water-soluble minerals. A 2011 comparison found canned/drained beans had lower nutrient density scores than home-cooked dried beans, though they remained a "nutrient-rich food" by USDA standards ^[7]. For maximum mineral intake at a lower cost, dried beans cooked at home remain the gold standard.

No other food bridges as many culinary traditions as the common bean. In Mexico, pinto and black beans are simmered with epazote and blended into frijoles refritos. In Brazil, feijão preto (black beans) form the base of feijoada, the national dish. In India, rajma (kidney beans) are slow-cooked in a tomato-onion gravy with cumin, coriander, and garam masala. Each tradition has independently optimized cooking technique to balance flavor, texture, and digestibility.

Soaking practices vary by culture and have measurable nutritional effects. Overnight soaking (8–12 hours) in plain water reduces cooking time by roughly 50% — from 156 minutes down to 78 minutes on average ^[8]. More importantly, soaking breaks down raffinose and stachyose, the oligosaccharides responsible for digestive gas production. Discarding the soaking water removes a significant fraction of these compounds.

The choice between canned and dried beans has both nutritional and economic dimensions. Dried beans yield roughly 12 half-cup servings per pound at an average cost of $0.12 per serving, while canned beans provide about 3.5 servings per can at $0.32 per serving ^[7]. Canned beans offer convenience with comparable fiber and protein, but they carry substantially more sodium and lower folate due to processing losses.

In Sub-Saharan Africa, where beans are a primary protein source for millions, cooking time directly affects food security — longer cooking means more fuel consumed ^[8]. Breeding programs are developing fast-cooking bean varieties that reach tenderness in under 40 minutes without pre-soaking, potentially saving families significant fuel costs while preserving the nutritional profile that makes beans irreplaceable in resource-limited diets.

Navy beans contain 10.5g of dietary fiber per 100g cooked — nearly 38% of the daily recommended intake in a single cup serving ^[1]. Pinto beans and pink beans follow closely at 9.0g each, while black beans provide 8.7g. This fiber content alone sets beans apart from almost every other cooked food, including whole grains.

A significant portion of bean carbohydrate exists as resistant starch (RS) — a type of starch that resists enzymatic digestion in the small intestine and reaches the colon intact. There, gut bacteria ferment RS into short-chain fatty acids (SCFAs), primarily butyrate, acetate, and propionate ^[2]. Butyrate serves as the primary energy source for colonocytes (colon lining cells), supporting intestinal barrier integrity and reducing inflammatory markers.

The prebiotic effect of bean fiber has measurable consequences. A two-month study in rats fed black beans showed increased abundance of butyrate-producing bacteria, elevated SCFA concentrations, significantly lower post-prandial glucose and insulin levels, and a 28% reduction in body fat compared to controls ^[2]. Human studies confirm that regular legume consumption is associated with improved gut microbial diversity and reduced markers of systemic inflammation ^[2].

All common bean varieties are classified as low glycemic index (GI) foods, with values ranging from approximately 29 to 39 depending on variety and preparation ^[6]. This slow glucose response is driven by the combination of resistant starch, soluble fiber, and alpha-amylase inhibitors naturally present in beans. For context, white rice has a GI of 73 and white bread 75 — adding a half-cup of beans to either meal measurably moderates the post-meal glycemic response.